1990 year
Main Index

Issue 1

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX001

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP001

Instructions for authors (1990) J. Chem. Soc., Dalton Trans. DOI:10.1039/DT9900000vii

Thermodynamic properties of Co3+(aq) David A. Johnson and Peter G. Nelson, pp 1 DOI:10.1039/DT9900000001

Synthesis of a 13-membered macrocyclic tetrathiadioxime and its mono- and tri-nuclear complexes with tetrahedrally co-ordinated palladium(II) Vefa Ahsen, Aysegül Gürek, Ahmet Gül and Özer Bekârolu, pp 5 DOI:10.1039/DT9900000005

Chemistry of ferroverdin: trinuclear species of type [M(FeL3)2](M = Mg, Ca, Mn, Fe, Co, Ni, Zn, or Cd; L = 4-methyl-1,2-benzoquinone 2-oximate) Partha Basu, Samudranil Pal and Animesh Chakravorty, pp 9 DOI:10.1039/DT9900000009

Calculation of the ring-current shifts of nuclear magnetic resonance signals caused by aromatic ligands in metal complexes Satoshi Tachiyashiki and Hideo Yamatera, pp 13 DOI:10.1039/DT9900000013

Complexes of ligands providing endogenous bridges. Part 8. Metal complexes of oxa-azamacrocycles derived from 1,5-diamino-3-pentanol; the X-ray crystal structure of a free macrocyclic ligand Neil A. Bailey, David E. Fenton and Derek J. Winter, pp 15 DOI:10.1039/DT9900000015

Piano-stool acylcyclopentadienyl iron complexes: photolytic syntheses and X-ray crystal structure of [Fe(5-C5H4COMe)(dppe)(NCMe)]PF6 Jaime Ruiz, Miguel A. González, Enrique Román and María T. Garland, pp 21 DOI:10.1039/DT9900000021

Linkage isomerism in rhodium(I) complexes of mixed anhydrides of diphenylphosphinous and acrylic acids: crystal and molecular structure of [RhCl(PPh3)(Ph2PO2CCHCHMe)] Andrzej F. Borowski, Ahmed Iraqi, Domenico C. Cupertino, Derek J. Irvine, David J. Cole-Hamilton, Mary H. Harmon and Michael B. Hursthouse, pp 29 DOI:10.1039/DT9900000029

Kinetic and mechanistic aspects of the redox dissociation of tetraphosphorus decasulphide in solution Michel C. Démarcq, pp 35 DOI:10.1039/DT9900000035

Molybdenum-95 nuclear magnetic resonance and vibrational spectroscopic studies of molybdenum(VI) species in aqueous solutions and solvent extracts from hydrochloric and hydrobromic acid: evidence for the complexes [Mo2O5(H2O)6]2+, [MoO2X2(H2O)2](X = Cl or Br), and [MoO2Cl4]2– Jan M. Coddington and Michael J. Taylor, pp 41 DOI:10.1039/DT9900000041

A dynamic nuclear magnetic resonance study of trimethylplatinum(IV) halide complexes of 1,1,2,2-tetrakis(methylthio)ethane. Part 3. Structure and fluxionality of dinuclear complexes [(PtXMe3)2{(MeS)2CHCH(SMe)2}] Edward W. Abel, Timothy P. J. Coston, Keith G. Orrell and Vladimir ik, pp 49 DOI:10.1039/DT9900000049

Solution chemistry in non-co-ordinating solvents (CH2Cl2, CHCl3) of nickel(II) and nickel(III) complexes of the lipophilic macrocycle 1-hexadecyl-1,4,8,11-tetra-azacyclotetradecane. The emphasized role of the anion co-ordination Michela Di Casa, Luigi Fabbrizzi, Mario Mariani and Barbara Seghi, pp 55 DOI:10.1039/DT9900000055

Synthesis and dynamic nuclear magnetic resonance studies of pentafluorobenzenethiolate complexes of molybdenum and tungsten. The crystal and molecular structures of [W(SC6F5)3(CO)(5-C5H5)]·0.5CH2Cl2 and [N(PPh3)2][Mo(SC6F5)4(5-C5H5)] W. A. Wan Abu Bakar, Jack L. Davidson, W. Edward Lindsell and Kevin J. McCullough, pp 61 DOI:10.1039/DT9900000061

Polyhedral metallaphosphaborane chemistry: the preparation, molecular structure, and nuclear magnetic resonance study of [2-Ph-1,1-(PMe2Ph)2-closo-1,2-PtPB10H10], and some related chemistry Steven R. Bunkhall, Xavier L. R. Fontaine, Norman N. Greenwood, John D. Kennedy and Mark Thornton-Pett, pp 73 DOI:10.1039/DT9900000073

Aqueous isopolymolybdates(VI): an oxygen-17 and molybdenum-95 nuclear magnetic resonance study Oliver W. Howarth, Paul Kelly and Lage Pettersson, pp 81 DOI:10.1039/DT9900000081

Photoinduced radical chain reactions between alkylcobalt(III) complexes and iodine Kunio Ishikawa, Shunichi Fukuzumi, Tatsushi Goto and Toshio Tanaka, pp 85 DOI:10.1039/DT9900000085

Ternary copper(II) complexes with 2,2-bipyridine and N-tosyl-substituted amino acids. Part 1. Polarographic and pH-metric study Giovanna Battistuzzi Gavioli, Marco Borsari, Ledi Menabue, Monica Saladini, Marco Sola, Luigi Pietro Battaglia, Anna Bonamartini Corradi and Giorgio Pelosi, pp 91 DOI:10.1039/DT9900000091

Ternary copper(II) complexes with 2,2-bipyridine and N-tosyl-substituted amino acids. Part 2. Crystal and molecular structure of aqua(2,2-bipyridine)bis(N-tosyl-DL-asparaginato-O)copper(II) dihydrate and (2,2-bipyridine)(N-tosyl-DL-asparaginato-NO)copper(II) monohydrate Giovanna Battistuzzi Gavioli, Marco Borsari, Ledi Menabue, Monica Saladini, Marco Sola, Luigi Pietro Battaglia, Anna Bonamartini Corradi and Giorgio Pelosi, pp 97 DOI:10.1039/DT9900000097

Electron diffraction study of tetraborane(8) carbonyl in the gas phase: structure determination of an endo/exo isomeric mixture Simon J. Cranson, Paul M. Davies, Robert Greatrex, David W. H. Rankin and Heather E. Robertson, pp 101 DOI:10.1039/DT9900000101

Equilibrium and kinetic study of imidazole binding to phthalocyaninatoiron(II) in dimethyl sulphoxide Paolo Ascenzi, Maurizio Brunori, Giovanna Pennesi, Claudio Ercolani and Fabrizio Monacelli, pp 105 DOI:10.1039/DT9900000105

Synthesis and characterization of gold adducts of [M(tppme)(P3)][M = Co, Rh, or Ir; tppme = 1,1,1-tris(diphenylphosphinomethyl)ethane]. X-Ray crystal structures of [Au{M(tppme)(P3)}2]PF6(M = Co, Rh, or Ir) Massimo Di Vaira, Piero Stoppioni and Maurizio Peruzzini, pp 109 DOI:10.1039/DT9900000109

X-Ray molecular structures of [Zn(C3Se5)2]2– and [Zn(CSe4)2]2– anion complexes Gen-etsu Matsubayashi, Kazuki Akiba and Toshio Tanaka, pp 115 DOI:10.1039/DT9900000115

Synthesis, characterisation, reactivity, and X-ray structure of cis-carbonylchlorobis[1-methyl-3-(pyridin-2-yl)-1,2,4-triazole-N4N]ruthenium hexafluorophosphate Robert J. Forster, Aidan Boyle, Johannes G. Vos, Ronald Hage, Anouk H. J. Dijkhuis, Rudolf A. G. de Graaff, Jaap G. Haasnoot, Rob Prins and Jan Reedijk, pp 121 DOI:10.1039/DT9900000121

Iron–iridium mixed-metal carbonyl clusters. Part 2. Synthesis and chemical behaviour of the tetranuclear complexes [FeIr3(CO)12]–, [Fe2Ir2(CO)12]2–, [Fe2Ir2H(CO)12]–, and [Fe3Ir(CO)13]–. Solid-state structures of [N(PPh3)2][FeIr3(CO)12], [NEt4]2[Fe2Ir2(CO)12], and [PPh4][Fe2Ir2(CO)12-{µ3-Au(PPh3)}] Roberto Della Pergola, Luigi Garlaschelli, Francesco Demartin, Mario Manassero, Norberto Masciocchi and Mirella Sansoni, pp 127 DOI:10.1039/DT9900000127

Comparison of the reactivity, electrochemical behaviour, and structure of the trans-bis(acido)tetra(pyridine)nitrosylruthenium cations (acido = hydroxo or chloro) Hisatoshi Nishimura, Hideyo Matsuzawa, Tadashi Togano, Masao Mukaida, Hidetake Kakihana and Frank Bottomley, pp 137 DOI:10.1039/DT9900000137

Synthesis and characterization of homo- and hetero-nuclear mixed thiolate phosphine complexes with NiII, PdII, and PtII. Crystal and molecular structure of bis[µ-(3-dimethylamino-1-propanethiolato)]-bis{[1,2-bis(diphenylphosphino)-ethane]nickel(II)} tetraphenylborate Mercč Capdevila, Pilar González-Duarte, Concha Foces-Foces, Félix Hernández Cano and Martín Martínez-Ripoll, pp 143 DOI:10.1039/DT9900000143

Tri- and tetra-nuclear homo- or hetero-metallic palladium(II) and platinum(II) complexes with double halide bridges. Molecular structure of [NBu4]2[(C6F5)2Pt(µ-Cl)2Pt(µ-Cl)2Pt(C6F5)2] Rafael Usón, Juan Forniés, Milagros Tomás, Babil Menjón, Javier Carnicer and Alan J. Welch, pp 151 DOI:10.1039/DT9900000151

Chemistry of phosphido-bridged dimolybdenum complexes. Part 4. Reactions of [Mo2(5-C5H5)2(µ-H)(µ-PR2)(CO)4](R = Ph or Me) with dienes Andrew D. Horton and Martin J. Mays, pp 155 DOI:10.1039/DT9900000155

Determination of the molecular structure of tris(trimethylsilyl)amine in the gas phase by electron diffraction David G. Anderson, David W. H. Rankin, Heather E. Robertson, Grete Gundersen and Ragnhild Seip, pp 161 DOI:10.1039/DT9900000161

Behaviour of [Ru(CO)2(MeCO2)2(PBun3)2] in the presence of carbon monoxide and/or hydrogen: crystal structure of [Ru6(µ-H)6(CO)10(µ-PHBun)(µ-PBun2)2-(PBun3)2(µ6-P)] Piero Frediani, Mario Bianchi, Antonella Salvini, Franco Piacenti, Sandra Ianelli and Mario Nardelli, pp 165 DOI:10.1039/DT9900000165

Stability constants and rate coefficients for decarboxylation of oxalacetic acid and some metal oxalacetates Cecil B. Monk, pp 173 DOI:10.1039/DT9900000173

6-Arene-stabilized ruthenacyclopentanes: synthesis, X-ray structures, and reaction with the trityl cation Paolo Barabotti, Pietro Diversi, Giovanni Ingrosso, Antonio Lucherini, Fabio Marchetti, Laura Sagramora, Victor Adovasio and Mario Nardelli, pp 179 DOI:10.1039/DT9900000179

Oxidation of sulphur (IV) by dodecatungstocobaltate(III) in aqueous acid solution Mahammad Ali, Swapan K. Saha and Pradyot Banerjee, pp 187 DOI:10.1039/DT9900000187

The versatility of the dihydrogenobis(1-pyrazolyl)borate ligand, H2B(pz)2–: novel anionic complexes with chromium(II), chromium(III), and manganese(II). X-Ray structure of [AsPh4][MnCl{H2B(pz)2}2] Massimo Di Vaira and Fabrizio Mani, pp 191 DOI:10.1039/DT9900000191

Synthesis, structure, and magnetism of binuclear copper(II) complexes of pyrazole ligands with nitrogen-containing chelating arms. First example of di-µ-pyrazolato-dicopper(II,II) complexes Toshiro Kamiusuki, Hisashi kawa, Naohide Matsumoto and Sigeo Kida, pp 195 DOI:10.1039/DT9900000195

Isolation, characterization, and kinetics of formation of the cis and trans isomers of bis(acetonitrile)dichloroplatinum(II) Francesco P. Fanizzi, Francesco P. Intini, Luciana Maresca and Giovanni Natile, pp 199 DOI:10.1039/DT9900000199

Mechanism of the conversion of [Ru(CO)5] into [Ru3(CO)12] W. Ross Hastings, Marc R. Roussel and Michael C. Baird, pp 203 DOI:10.1039/DT9900000203

Thermodynamics of protonation and copper(II) complex formation of -aminomalonic acid Rolando Barbucci, Mario Casolaro and Adamo Fini, pp 207 DOI:10.1039/DT9900000207

Molecular and crystal structure of cis-bis(L-hydroxyprolinato)-copper(II) tetrahydrate and trans-bis(D-allohydroxyprolinato)-copper(II)–water(2/5) Maria A. A. F. de C. T. Carrondo, M. Teresa Leal S. Duarte, Maria L. S. Simőes Gonçalves, Paul O'Brien and Michael B. Hursthouse, pp 213 DOI:10.1039/DT9900000213

Structures of indium trihalide complexes with phosphine oxides and dimethyl sulphoxide, with comments on the metal–oxygen bonding Ward T. Robinson, Cuthbert J. Wilkins and Zhang Zeying, pp 219 DOI:10.1039/DT9900000219

On the formal potential of the cerium(IV)–cerium(III) couple at –5 °C in 6.5 mol kg–1 HClO4 Roberto Zingales, pp 229 DOI:10.1039/DT9900000229

Cobalt(III) complexes of 1,5,9-triamino-5-methyl-3,7-diazanonane, L1, a new quinquedentate polyamine ligand. Crystal structures of the chlorocobalt(III) and µ-superoxo-dicobalt(III) complexes of L1 Paul V. Bernhardt, Geoffrey A. Lawrance and Trevor W. Hambley, pp 235 DOI:10.1039/DT9900000235

Synthesis, reactions, and X-ray structures of the functionalized isocyanide complexes [Fe2{µ-CNC(O)SR}(µ-CO)(CO)2(cp)2](cp =-C5H5, R = Me or Et) and of their carbyne and carbene derivatives Luigi Busetto, Lucia Carlucci, Valerio Zanotti, Vincenzo G. Albano and Dario Braga, pp 243 DOI:10.1039/DT9900000243

Palladium(II) and platinum(II)3-methylallyl trichlorotin complexes. Part 3. Crystal structure analysis of [Pt(3-C4H7)(cod)]2[Pt(3-C4H7)(SnCl3)3](cod = cyclo-octa-1,5-diene) Maria Grassi, Stefano V. Meille, Alfredo Musco, Roberto Pontellini and Angelo Sironi, pp 251 DOI:10.1039/DT9900000251

Structure of a carboxylate-bridged tetra-azamacrocyclic complex of cobalt(III) Theodore A. DelDonno, Naohide Matsumoto, Daryle H. Busch and Nathaniel W. Alcock, pp 257 DOI:10.1039/DT9900000257

Mössbauer studies on cytochrome b models: bis ligated complexes of iron(III) protoporphyrinate IX with imidazole and substituted imidazoles Okhil K. Medhi and Jack Silver, pp 263 DOI:10.1039/DT9900000263

Synthesis, electrochemistry, and magnetic properties of binuclear cobalt complexes containing the Co2(µ-X)(µ-carboxylato)2n+ core (X = OH, Cl, or Br; n= 1–3). The crystal structures of [Co2II(µ-ClH2CCO2)2(µ-Cl)L2]PF6 and [CoIICoIII(µ-MeCO2)2(µ-OH)L2][ClO4]2·0.5H2O (L =N,N,N-trimethyl-1,4,7-triazacyclononane) Phalguni Chaudhuri, Jürgen Querbach, Karl Wieghardt, Bernhard Nuber and Johannes Weiss, pp 271 DOI:10.1039/DT9900000271

Synthesis of mixed diaryltin(IV) complexes using an arylmercury compound. Crystal and molecular structure of [Sn (2-C6H4NNPh)(Ph)Cl2] José Vicente, Maria Teresa Chicote, Maria del Carmen Ramirez-de-Arellano, Giancarlo Pelizzi and Francesca Vitali, pp 279 DOI:10.1039/DT9900000279

Protonation reactions of dinitrogen complexes of molybdenum and tungsten with PMe3 as Co-ligand. X-Ray structure of the hydrazidium complex [WCl(NNH3)(PMe3)4] Cl2 Agustin Galindo, Adrian Hills, David L. Hughes, Raymond L. Richards, Mark Hughes and Joan Mason, pp 283 DOI:10.1039/DT9900000283

Tyrosinate and lysinate as bridging residues in copper(II) dipeptide complexes Barbara Radomska, Imre Sovago and Tamas Kiss, pp 289 DOI:10.1039/DT9900000289

Synthesis, crystal structure, and electrochemical properties of µ-{2,5-bis[N,N-bis(2-pyridylmethyl)aminomethyl]pyrazine}-bis[chlorocopper(II)] perchlorate Hiroki Oshio, Koshiro Toriumi and Yoshihito Hayashi, pp 293 DOI:10.1039/DT9900000293

Synthesis and reactivity of the µ(1,n)-alkanediyl complexes [(OC)5M(CH2)nM(CO)5](M = Mn, n= 4–6; M = Re, n= 3 or 4) Selwyn F. Mapolie and John R. Moss, pp 299 DOI:10.1039/DT9900000299

A rapid method for the synthesis of water-soluble platinum(II) amine and pyridine complexes Jean-Pierre Souchard, Franz L. Wimmer, Tam T. B. Ha and Neil P. Johnson, pp 307 DOI:10.1039/DT9900000307

Kinetics of oxidation of amino acids by alkaline hexacyanoferrate(III) Didcy Laloo and Mahendra K. Mahanti, pp 311 DOI:10.1039/DT9900000311

Complexes of rhenium and osmium with o-phenylenediamine and o-aminobenzenethiol. X-Ray crystal structures of [Re{o-(HN)2C6H4}3][ReO4], Re[o-(HN)2C6H4]3, Re[o-(HN)2C6H4]2[o-(HN)NC6H4], K[Re{o-(HN)2C6H4}-{o-(HN)NC6H4}2], and M[o-(HN)SC6H4]3(M = Re or Os) Andreas A. Danopoulos, Anthony C. C. Wong, Geoffrey Wilkinson, Michael B. Hursthouse and Bilquis Hussain, pp 315 DOI:10.1039/DT9900000315

Synthesis of (diphenylphosphinothioyl)methyldiphenylphosphoniomethanide complexes of gold and silver. X-Ray structure of [Au(C6F5){SPh2PCH[Au(C6F5)]PPh2Me}] Rafael Usón, Antonio Laguna, Mariano Laguna, M. Nieves Fraile, Isabel Lázaro, M. Concepción Gimeno, Peter G. Jones, Christa Reihs (née Fittschen) and George M. Sheldrick, pp 333 DOI:10.1039/DT9900000333

Co-ordination chemistry of higher oxidation states. Part 32. Synthetic, spectroscopic, and electrochemical studies of some trans-[OsL2X4]–[OsL2X4]– systems (L = PR3, AsR3, SbR3, SeMe2, or pyridine; X = Cl or Br). Crystal structure of [PPh4][Os(PEt3)2Cl4] Robert A. Cipriano, William Levason, Roy A. S. Mould, Derek Pletcher and Michael Webster, pp 339 DOI:10.1039/DT9900000339

Characterisation of the oxo-anions of bromine BrOx–(x= 1–4) by infrared, Raman, nuclear magnetic resonance, and bromine K-edge extended X-ray absorption fine structure techniques William Levason, J. Steven Ogden, Mark D. Spicer and Nigel A. Young, pp 349 DOI:10.1039/DT9900000349

Discrete variational X calculations of the spectra of chlorocuprate(II) complexes: a detailed comparison with experiment and the cellular ligand field model
Robert J. Deeth,Â
pp 355 DOI:10.1039/DT9900000355

Theoretical support for the latest assignment of the electronic spectrum of [CrOCl4]– Robert J. Deeth, pp 365 DOI:10.1039/DT9900000365

A reinterpretation of the crystal structures of the p-, m-, and o-xylene and carbon disulphide clathrates of tetrakis(4-ethylpyridine)di-isothiocyanato-nickel(II) Madeleine H. Moore, Luigi R. Nassimbeni and Margaret L. Niven, pp 369 DOI:10.1039/DT9900000369

Reaction of [Rh(4-cot)(-C5H5)](cot = cyclo-octatetraene) with [Fe{P(OMe)3}(NO)2(3-CH2 CHCH2)]+: allylic alkylation of a cyclopentadienyl ring Neil G. Connelly and Mark Gilbert, pp 373 DOI:10.1039/DT9900000373

Reconsideration of the crystal structure refinement of the complex [Nb(-C5H4SiMe3)2Cl2] Anna Maria Manotti Lanfredi, Antonio Tiripicchio, Moshe Kapon and George M. Reisner, pp 375 DOI:10.1039/DT9900000375

Copper(II) complexes of ligands containing both aminocarboxylate and aminophosphinate moieties Tamas Kiss, Etelka Farkas, Malgorzata Jezowska-Bojczuk, Henryk Kozlowski and Ewa Kowalik, pp 377 DOI:10.1039/DT9900000377

Electronic wavefunctions and solution nuclear magnetic resonance parameters of some mixed fluorochloro-osmates(IV) Abdul O. Alyoubi, David J. Greenslade, Mark J. Forster and W. Preetz, pp 381 DOI:10.1039/DT9900000381

Additions and corrections Sumio Kaizaki and Mariko Hayashi, pp 385 DOI:10.1039/DT9900000385

Refereeing procedure and policy (1990) J. Chem. Soc., Dalton Trans. DOI:10.1039/DT990000xxvi

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX003

Issue 2

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX005

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP007

Catalytic air and amine N-oxide oxidation of p-substituted benzoin by molybdenum(VI) complexes. Identification of the deactivation process by dioxygen Norikazu Ueyama, Naoto Yoshinaga and Akira Nakamura, pp 387 DOI:10.1039/DT9900000387

Stereochemistry of tervalent aqua ions: low-temperature neutron diffraction structures of CsFe(SO4)2·12H2O and CsFe(SeO4)2·12H2O Stephen P. Best and J. Bruce Forsyth, pp 395 DOI:10.1039/DT9900000395

Kinetics of displacement of dimethyl sulphoxide (dmso) from [Pt(N-N)(dmso)X]+ by X-[N-N = 1,10-phenanthroline, 2,2-bipyridyl, or 2,2-bis(2-pyridyl)-1,3-dioxolane; X = Cl or Br] Giuliano Annibale, Luciano Canovese, Gavino Chessa, Lucio Cattalini and Martin L. Tobe, pp 401 DOI:10.1039/DT9900000401

Reduction of the incomplete cuboidal molybdenum(IV) aqua ion [Mo3(µ3-O)(µ-O)3(OH2)9]4+ by Eu2+. Characterisation of the trinuclear molybdenum(III) and mixed-valence molybdenum(III,III,IV) aqua ions by oxygen-17 nuclear magnetic resonance spectroscopy David T. Richens and Christian Guille-Photin, pp 407 DOI:10.1039/DT9900000407

Detection of a new polymeric species formed through the hydrolysis of gallium(III) salt solutions Susan M. Bradley, Ronald A. Kydd and Raghav Yamdagni, pp 413 DOI:10.1039/DT9900000413

cis-trans Isomerism in some octahedral diaryltin(IV) dichloride complexes with bidentate ligands Brian N. Biddle, John S. Gray and Alan J. Crowe, pp 419 DOI:10.1039/DT9900000419

Intercalation of 2-aminopropylamino-substituted -cyclodextrin by -and -zirconium phosphates Tsuyoshi Kijima, pp 425 DOI:10.1039/DT9900000425

Coupling constants nJ(195Pt-1H), nJ(195Pt-13C) and Pt-H-C interactions in new Schiff-base complexes ofN-alkyl-1-(N-methylpyrrol-1-yl)ethanimine Ibrahim M. Al-Najjar and Hassan B. Amin, pp 429 DOI:10.1039/DT9900000429

X-Ray crystal structure of chloro(cyclo-octa-1,5-diene)[4-dimethylamino-2-methyl(nitroso)benzene-N]rhodium(I) and a nuclear magnetic resonance study of nitroso-rhodium co-ordination Gen-etsu Matsubayashi and Toshio Tanaka, pp 437 DOI:10.1039/DT9900000437

Cyclometallation reactions of 6-phenyl-2,2-bipyridine; a potential C,N,N-donor analogue of 2,2: 6,2-terpyridine. Crystal and molecular structure of dichlorobis(6-phenyl-2,2-bipyridine)ruthenium(II) Edwin C. Constable, Roland P. G. Henney, Troy A. Leese and Derek A. Tocher, pp 443 DOI:10.1039/DT9900000443

2,4,6-Trinitrophenylgold(I) complexes. X-Ray crystal structures of [Au(SbPh3)4][Au{C6H2(NO2)3-2,4,6}2]·Et2O and [Au{C6H2(NO2)3-2,4,6}(dmphen)](dmphen = 2,9-dimethyl-1,10-phenanthroline) Jose Vicente, Aurelia Arcas, Peter G. Jones and Jürgen Lautner, pp 451 DOI:10.1039/DT9900000451

Proton electron nuclear double resonance spectra of oxovanadium(IV) complexes formed by salicylic and o-diphenolic ligands in aqueous solution Mario Branca, Giovanni Micera and Alessandro Dessi', pp 457 DOI:10.1039/DT9900000457

Synthesis and characterization of novel metal(III) complexes of corrole. Crystal and molecular structure of (2,3,7,8,12,13,17,18-octamethylcorrolato)(triphenylarsine) rhodium(III) Tristano Boschi, Silvia Licoccia, Roberto Paolesse, Pietro Tagliatesta, Massoud Azarnia Tehran, Giancarlo Pelizzi and Francesca Vitali, pp 463 DOI:10.1039/DT9900000463

Synthesis, structure, and spectral and magnetic properties of trinuclear copper(II) complexes bridged by glyoximate groups Hisashi kawa, Masayuki Koikawa, Sigeo Kida, Dominique Luneau and Hiroki Oshio, pp 469 DOI:10.1039/DT9900000469

The chemistry of heteroallyl derivatives of technetium. Reactivity of [TcNCl2(PPh3)2] and [Tc(CO)3Cl(PPh3)] with thiazetidine ligands, crystal structures of [Tc(CO)2(PPh3)2{PhNC(OEt)S}] and [TcN(Cl)(PPh3)-{PhNC(OEt)S}] Roberto Rossi, Andrea Marchi, Sara Aggio, Luciano Magon, Adriano Duatti, Umberto Casellato and Rodolfo Graziani, pp 477 DOI:10.1039/DT9900000477

Structural reinforcement of a large macrocyclic ligand. A structural, molecular mechanics, and thermodynamic study Peter W. Wade, Robert D. Hancock, Jan C. A. Boeyens and Susan M. Dobson, pp 483 DOI:10.1039/DT9900000483

Addition reactions and rearrangements of 2,3-bis(diphenylphosphino)propene and its complexes with Group 6 metal carbonyls: routes to complexes of 1,2,3-tris(diphenylphosphino)propane Jonathan L. Bookham and William McFarlane, pp 489 DOI:10.1039/DT9900000489

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 96. Reactions with phospha-alkynes; crystal structures of [WFe{µ-C(C6H4Me-4)PC(But)(CO)5}(-C5Me5)] and [MoFe{µ-C(C6H4Me-4)C(But)P}(µ-CO)(CO)3(PMe3)(-C5H5)] Helen F. Dare, Judith A. K. Howard, Thomas P. Spaniol, F. Gordon A. Stone and Jürgen Szameitat, pp 495 DOI:10.1039/DT9900000495

The interaction of lead(II) with oxa-aza macrocycles: the X-ray crystal structures of lead(II) complexes of an N3O3 Schiff-base macrocycle and of the corresponding saturated macrocycle Alan Bashall, Mary McPartlin, Brian P. Murphy, David E. Fenton, Simon J. Kitchen and Peter A. Tasker, pp 505 DOI:10.1039/DT9900000505

Nitrogen-14 nuclear magnetic resonance studies on sulphur-nitrogen compounds Ivan P. Parkin, J. Derek Woollins and Peter S. Belton, pp 511 DOI:10.1039/DT9900000511

Preparation and properties of [M{S2N3(SO2NH2)}(PR3)2] and [Pt{SO2(NH)2}(PR3)2] from reactions in liquid ammonia Ivan P. Parkin and J. Derek Woollins, pp 519 DOI:10.1039/DT9900000519

Macrocycles incorporating closo- and nido-carbaborane cages: molecular structure of 1,2-(3-oxapentane-1,5-dithiolato-SS)-1,2-dicarba-closo-dodecaborane Francesc Teixidor, Antonio M. Romerosa, Jordi Rius, Carles Miravitlles, Jaume Casabó, Clara Viñas and Eustaquio Sanchez, pp 525 DOI:10.1039/DT9900000525

Direct electrochemical synthesis of pyridine-2-thionato complexes of nickel(II): the crystal structure of (2,2-bipyridine)bis(pyridine-2-thionato)nickel(II)-2,2-bipyridine(2/1) Rosa Castro, María L. Durán, José A. García-Vázquez, Jaime Romero, Antonio Sousa, Alfonso Castiñeiras, Wolfgang Hiller and Joachim Strähle, pp 531 DOI:10.1039/DT9900000531

Qxidative addition of thiols to a binuclear platinum complex; the crystal structure of [Pt2(µ-S)(SCH2Ph)2(µ-Ph2PCH2PPh2)2] Nasim Hadj-Bagheri, Richard J. Puddephatt, Ljubica Manojlovi-Muir and Aleksandar Stefanovi, pp 535 DOI:10.1039/DT9900000535

Reactions of carbon dioxide with electron-rich trimethylphosphine compounds of rhenium and tungsten: crystal structure of [W(PMe3)4H2(CO3)] David L. Allen, Malcolm L. H. Green and Judith A. Bandy, pp 541 DOI:10.1039/DT9900000541

Synthetic and spectroscopic studies of phosphoranides [PR(CN)2X]- and the crystal and molecular structure of [NEt4][PPh(CN)2Cl] Robert M. K. Deng, Keith B. Dillon and William S. Sheldrick, pp 551 DOI:10.1039/DT9900000551

Models of cytochrome b: Mössbauer studies on bis-ligated complexes of (protoporphyrinato IX)iron(III) with histidine and its substituted derivatives Okhil K. Medhi and Jack Silver, pp 555 DOI:10.1039/DT9900000555

High-potential isomeric ruthenium(III) complexes of 2-(phenylazo)pyridine Goutam Kumar Lahiri, Samaresh Bhattacharya, Sreebrata Goswami and Animesh Chakravorty, pp 561 DOI:10.1039/DT9900000561

Heteronuclear transition metal-alkyne clusters. Part 2. Formation of trinuclear clusters via reactions of [W(CO)(R1C2R2)(S2CNR2)2](R1= R2= Ph or H, R = Me or Et; R1= R2= R = Me; R1= Ph, R2= H, R = Et) with octacarbonyldicobalt. X-Ray crystal structure of [WCo2(µ-S)(µ-SCNEt2)(CO)4(C2Ph2)(S2CNEt2)] John C. Jeffery and Michael J. Went, pp 567 DOI:10.1039/DT9900000567

Multihydride complexes of rhenium, osmium or iridium containing monodentate ditertiary phosphine ligands: selective hydrogen-deuterium exchanges of the rhenium multihydrides Stuart W. Carr, Edmund H. Fowles, Xavier L. R. Fontaine and Bernard L. Shaw, pp 573 DOI:10.1039/DT9900000573

Heteroleptic poly(pyrazolyl)borate derivatives of the lanthanide ions. The synthesis of tropolonate and carboxylate complexes and the X-ray crystal structures of [Yb{HB(C3N2H3)3}2(O2C7H5)] and [Yb{HB(C3N2H3)3}2(O2CPh)] Michael A. J. Moss and Christopher J. Jones, pp 581 DOI:10.1039/DT9900000581

Intracage reactions in sodalites Mark T. Weller, Gordon Wong, Cathy L. Adamson, Simon M. Dodd and J. James B. Roe, pp 593 DOI:10.1039/DT9900000593

Kinetics and mechanism of the hydrolysis of cis--carbonato(3,7-diazanonane-1,9-diamine)cobalt(III) and cis--carbonato(4,7-diazadecane-1,10-diamine)cobalt(III) cations in acidic aqueous solution Francisco D. Baeta, Stanley A. Bajue and Tara P. Dasgupta, pp 599 DOI:10.1039/DT9900000599

Studies on the synthesis and electrochemistry of crown ether dithiocarbamates and the molecular dynamics of bis(aza-15-crown-5)thiuram disulphide. Crystal structure of cobalt tris[(aza-15-crown-5)dithiocarbamate] Jaume Granell, Malcolm L. H. Green, Valerie J. Lowe, Seth R. Marder, Philip Mountford, Graham C. Saunders and Neil M. Walker, pp 605 DOI:10.1039/DT9900000605

Kinetics of the oxidation of ascorbic acid and substituted 1,2- and 1,4-dihydroxybenzenes by the hexacyanoruthenate(III) ion in acidic perchlorate media J. Mark A. Hoddenbagh and Donal H. Macartney, pp 615 DOI:10.1039/DT9900000615

Complexes of the platinum metals. Part 37. Benzotriazole and 5,6-dimethylbenzotriazole derivatives. X-Ray crystal structure of carbonylhydrido[hydrogenbis(benzotriazolato)]bis(triphenylphosphine)osmium(II) Bruce G. Olby, Stephen D. Robinson, Michael B. Hursthouse and Richard L. Short, pp 621 DOI:10.1039/DT9900000621

Complexes of the platinum metals. Part 38. The synthesis and X-ray crystal structure of an asymmetric binuclear ruthenium(I, I) di-p-tolyltriazenido complex [Ru2(µ-RNNNR)(RNNNR)(µ-CO)2(CO)2(bipy)](R =p-tolyl, bipy = 2,2-bipyridyl) Stephen F. Colson, Stephen D. Robinson and Derek A. Tocher, pp 629 DOI:10.1039/DT9900000629

A novel calcium hydroxide molecular composite: preparation and characterisation Adrian C. Gray and Charis R. Theocharis, pp 633 DOI:10.1039/DT9900000633

Radical cations of dialkylmercury derivatives, radiation synthesis and electron spin resonance detection Akinori Hasegawa, Jan Rideout and Martyn C. R. Symons, pp 637 DOI:10.1039/DT9900000637

Studies of collectors. Part 12. The flotation of gallium ion with polyphenol-type surfactants Yoshifumi Koide, Katsuhiro Sakurai, Hideto Shosenji and Kimiho Yamada, pp 641 DOI:10.1039/DT9900000641

Macrocyclic complexes with lanthanoid salts part 38. Synthesis and luminescence study of homo- and hetero-binuclear complexes of lanthanides with a new cyclic compartmental Schiff base Paolo Guerriero, Pietro Alessandro Vigato, Jean-Claude G. Bünzli and Emmanuel Moret, pp 647 DOI:10.1039/DT9900000647

Syntheses and molecular structures of the tridentate phosphine ligand 2-[Ph2P(CH2)3NCH]C6H4OH (HL) and its rhenium(V) complex [ReOCl2L]·0.25CH2Cl2 Hilary J. Banbery, Wasif Hussain, Thomas A. Hamor, Christopher J. Jones and Jon. A. McCleverty, pp 657 DOI:10.1039/DT9900000657

Phosphorus-31, nitrogen-15, and nitrogen-14 nuclear magnetic resonance spectra of -tetraphosphorus trisulphide isothiocyanates Bruce W. Tattershall, pp 663 DOI:10.1039/DT9900000663

Aluminium(III) chloride-chlorohydrocarbon chemistry. Fourier transform infra-red spectroscopic studies of the reactions between solid aluminium (III) chloride and 1,1,1-trichloroethane or 1,1-dichloroethene vapours David G. McBeth, John M. Winfield, Bernard W. Cook and Neil Winterton, pp 671 DOI:10.1039/DT9900000671

The structure of [7,8-C2B9H12]-; correction of a popular misconception Jill Buchanan, Ewan J. M. Hamilton, David Reed and Alan J. Welch, pp 677 DOI:10.1039/DT9900000677

Polyhedral metallacarbaborane chemistry: preparation, molecular structure, and nuclear magnetic resonance investigation of [3-(5-C5Me5)-closo-3,1,2-MC2B9H11](M = Rh or Ir) Xavier L. R. Fontaine, Norman N. Greenwood, John D. Kennedy, Karl Nestor, Mark Thornton-Pett, Stanislav Hemánek, Tomá Jelínek and Bohumil tíbr, pp 681 DOI:10.1039/DT9900000681

Notes. X-Ray crystal and molecular structures of [(diphenylphosphinomethyl)diphenylphosphine sulphide]di-iodomercury(II) and [1,2-bis(diphenylphosphinothioyl)ethane]dichloromercury(II) Tarlok S. Lobana, (Miss) Maninderjeet K. Sandhu, Michael J. Liddell and Edward R. T. Tiekink, pp 691 DOI:10.1039/DT9900000691

Blue transient complex formation in the electron-transfer reaction between iron(III) and a reduced nicotinamide-adenine dinucleotide analogue without an amide group Shunichi Fukuzumi, Seiji Mochizuki and Toshio Tanaka, pp 695 DOI:10.1039/DT9900000695

Crystal and molecular structures of the antiferromagnetic linear chain halide-bridged complexes [CrX2(MeCN)2](X = Cl or Br) Dost M. Halepoto, Leslie F. Larkworthy, David C. Povey, B. Joly Tucker and Gallienus W. Smith, pp 699 DOI:10.1039/DT9900000699

Synthesis and crystal structure of [Ru2(CO)6(µ-PPh2)(µ-PCHCHC6H4)], a complex with an unprecedented phospha-bicyclic ligand, obtained from [Ru3(µ-H)(CO)8(Ph2PCHCH2)(µ3-Ph2PCHCH)]via reductive elimination reactions Daniele Belletti, Antonio Tiripicchio, Marisa Tiripicchio Camellini and Enrico Sappa, pp 703 DOI:10.1039/DT9900000703

Complexation between molybdenum(VI) and citrate: structural characterisation of a tetrameric complex, K4[(MoO2)4O3(cit)2]·6H2O Nathaniel W. Alcock, Magdalena Dudek, Ryszard Grybo, Ewa Hodorowicz, Aleksandra Kanas and Alina Samotus, pp 707 DOI:10.1039/DT9900000707

Synthesis of tetrafluoro(5-pentamethylcyclopentadienyl)tantalum(V) and X-ray crystal structure of its AsF3 solvate, [{Ta(5-C5Me5)F4}2]·2AsF3 Herbert W. Roesky, Frank Schrumpf and Mathias Noltemeyer, pp 713 DOI:10.1039/DT9900000713

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX007

Issue 3

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX009

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP013

Spectroscopic studies on the hexafluorides of ruthenium and rhodium isolated in low-temperature matrices Alan K. Brisdon, Peter J. Jones, William Levason, J. Steven Ogden, John H. Holloway, Eric G. Hope and Gillian Stanger, pp 715 DOI:10.1039/DT9900000715

Co-ordination chemistry of higher oxidation states. Part 33. Five-co-ordinate diphosphine complexes of cobalt(III), [Co{Ph2P(CH2)nPPh2}X3](n= 4 or 5, X = Cl or Br) William Levason and Mark D. Spicer, pp 719 DOI:10.1039/DT9900000719

Spectroscopic studies on molecular vanadium pentafluoride isolated in inert gas matrices Eric G. Hope, pp 723 DOI:10.1039/DT9900000723

Group 11 metal(I) complexes with low co-ordination numbers: the crystal structures of [PPh3Me]2[CuBr3], [PPh3Me]2[CuBr2]Br, and [PPh3Me]2[AgI3] Graham A. Bowmaker, Annamaria Camus, Brian W. Skelton and Allan H. White, pp 727 DOI:10.1039/DT9900000727

Co-ordination state of copper(II) ion in Cu(O2CMe)2–pyridine derivative–diluent mixtures; the steric effect of the amine ligand Irmina Uruska, Jan Zielkiewicz and Maria Szpakowska, pp 733 DOI:10.1039/DT9900000733

Studies on transition-metal oxo and nitrido complexes. Part 11. New oxo complexes of ruthenium as aerobically assisted oxidants, and the X-ray crystal structure of [Ru2O6(py)4]·3.5H2O Andrew C. Dengel, Ahmed M. El-Hendawy, William P. Griffith, Caroline A. O'mahoney and David J. Williams, pp 737 DOI:10.1039/DT9900000737

Kinetic studies in aqueous solutions of iron(II)-glycinate, -ethylenediamine, and -malonate complexes Károly Micskei and István Nagypál, pp 743 DOI:10.1039/DT9900000743

Complexes of peptide hydroxamates. Complex formation between transition metals and L-prolyl-L-leucylglycinehydroxamic acid [N-hydroxy-7-methyl-4-oxo-5-(pyrrolidine-2-carboxamido)-3-azaoctanamide] and L-prolyl-L-leucinehydroxamic acid [N-hydroxy-4-methyl-2-(pyrrolidine-2-carboxamido)pentanamide] Etelka Farkas and Ildikó Kiss, pp 749 DOI:10.1039/DT9900000749

Equilibrium and structural studies of silicon(IV) and aluminium(III) in aqueous solution. Part 22. A potentiometric study of mono- and poly-nuclear aluminium(III) tartrates Eva Marklund and Lars-Olof Öhman, pp 755 DOI:10.1039/DT9900000755

Organic chemistry of dinuclear metal centres. Part 14. Synthesis, X-Ray structure, and reactivity of the ruthenium–ruthenium double-bonded complex [Ru2(µ-CO)(µ-C2Ph2)(-C5H5)2] Robert E. Colborn, Andrew F. Dyke, Benjamin P. Gracey, Selby A. R. Knox, Kirsty A. Macpherson, Kevin A. Mead and A. Guy Orpen, pp 761 DOI:10.1039/DT9900000761

Ligand substitution reactions of the nickel–sulphur cluster [Ni3S2(PEt3)6]2+. Phosphorus-31 nuclear magnetic resonance characterization of mono- and di-substituted species and X-ray crystal structure of [Ni3(µ3-S)2(PEt3)5Cl]BPh4 Franco Cecconi, Carlo A. Ghilardi, Stefano Midollini, Annabella Orlandini, Alberto Vacca and Jose A. Ramirez, pp 773 DOI:10.1039/DT9900000773

Metallacyclic complexes. Part 3. Reactions of metallathietane 3,3-dioxide complexes of platinum(II) and palladium(II) with alkyl isocyanides; the single crystal X-ray structure of [Pt{CH(COPh)S(O)2C(COPh)CNHBun}(CNBut)-(PPh3)]·CHCl3 William Henderson, Raymond D. W. Kemmitt, Lesley J. S. Prouse and David R. Russell, pp 781 DOI:10.1039/DT9900000781

Polynuclear platinum–silver, –copper, and –gold acetylide complexes. Molecular structure of [Pt2Ag4(CCBut)8] Pablo Espinet, Juan Forniés, Francisco Martinez, Milagros Tomás, Elena Lalinde, M. Teresa Moreno, Alejandro Ruiz and Alan J. Welch, pp 791 DOI:10.1039/DT9900000791

The heteronuclear cluster chemistry of the Group 1B metals. Part 13. Synthesis and structural characterization of the bimetallic hexanuclear Group 1B metal cluster compounds [M2Ru4(µ-CO)3(CO)10(PPh3)2](M = Cu, Ag, or Au). X-Ray structure analyses of [M2Ru4(µ-CO)3(CO)10(PPh3)2](M = Cu or Ag) Scott S. D. Brown, Ian D. Salter, Trushar Adatia and Mary McPartlin, pp 799 DOI:10.1039/DT9900000799

Reaction of diphenyl(vinyl)phosphine with carbonyls [M3(CO)12](M = Ru or Os); oxidative addition at [Ru3(CO)12]. Spectroscopic characterization and crystal structure of [Ru3(µ-H)(CO)8(Ph2PCHCH2)(µ3-Ph2PCHCH)] Roberto Gobetto, Enrico Sappa, Antonio Tiripicchio, Marisa Tiripicchio Camellini and Martin J. Mays, pp 807 DOI:10.1039/DT9900000807

Photochemistry of carbonyl(µ5-cyclopentadienyl)dihydridoiridium in frozen gas matrices at ca. 12 K: infrared evidence relating to C–H activation Peter E. Bloyce, Antony J. Rest and Ian Whitwell, pp 813 DOI:10.1039/DT9900000813

Photochemistry of pentacarbonyl(cyclohepta-1,3,5-triene-7-carbonyl)manganese and pentacarbonyl(-cycloheptatrienyl)rhenium in frozen gas matrices at ca. 12 K: infrared spectroscopic evidence for carbon monoxide ejection with concomitant polyene ring hapticity changes Andrew K. Campen, Ramaier Narayanaswamy and Antony J. Rest, pp 823 DOI:10.1039/DT9900000823

Photochemistry of some manganese and chromium dinuclear metal carbonyl complexes in frozen gas matrices at ca. 12 K Peter E. Bloyce, Richard H. Hooker, Antony J. Rest, Thomas E. Bitterwolf, Noel J. Fitzpatrick and Joyce E. Shade, pp 833 DOI:10.1039/DT9900000833

Steric effects in the reactions of zinc(II) and iron(III)capped porphyrins Cynthia T. Brewer and Greg Brewer, pp 843 DOI:10.1039/DT9900000843

Electronic structures of transition-metal four-co-ordinated complexes. Part 3. Theoretical ab initio and ultraviolet photoelectron spectroscopy study of nickel(II), palladium(II), and platinum(II) bis(O,O-diethyl dithiophosphate) square-planar complexes Enrico Ciliberto, Santo Di Bella, Ignazio Fragalŕ, Gaetano Granozzi, Neil A. Burton, Ian H. Hillier, John Kendrick and Martyn F. Guest, pp 849 DOI:10.1039/DT9900000849

Crystal structures and physical properties of bis(ethylenedithio)-tetrathiafulvalene charge-transfer salts with FeX4–(X = Cl or Br) anions Talal Mallah, Claire Hollis, Simon Bott, Mohamedally Kurmoo, Peter Day, Margaret Allan and Richard H. Friend, pp 859 DOI:10.1039/DT9900000859

The appearance of a stable intermediate in some substitution reactions of (1,5-diamino-3-azapentane)pyridinepalladium(II) perchlorate Luciano Canovese, Lucio Cattalini, Paolo Uguagliati and Martin L. Tobe, pp 867 DOI:10.1039/DT9900000867

Complexes of ligands providing endogenous bridges. Part 9. Copper(II) complexes of 1,11-diamino-6-hydroxy-4,8-diazaundecane: the use of fast atom bombardment mass spectrometry to monitor exogenous bridge strength W. Daniel Carlisle and David E. Fenton, pp 873 DOI:10.1039/DT9900000873

Reactivity of tricyclopentadienyl uranium tetrahydroaluminate Franco Ossola, Nicola Brianese, Marina Porchia, Gilberto Rossetto and Pierino Zanella, pp 877 DOI:10.1039/DT9900000877

Instant ligands. Part 4. Preparation of some difluorophosphinite ligands from unsaturated hydroxy compounds, and their reactions to form molybdenum complexes Martin J. Davis and David W. H. Rankin, pp 881 DOI:10.1039/DT9900000881

Magnetic field effects on the reactivity of co-ordination complexes: a probe of the transition-state magnetic properties in outer-sphere electron transfers S. Ronco and G. Ferraudi, pp 887 DOI:10.1039/DT9900000887

Copper(II)-assisted hydrolysis of 2,4,6-tris(2-pyridyl)-1,3,5-triazine. Part 3. Crystal structures of diaqua[bis(2-pyridylcarbonyl)amido]copper(II) nitrate dihydrate and aquabis(pyridine-2-carboxamide)copper(II) nitrate monohydrate Isabel Castro, Juan Faus, Miguel Julve, Josep M. Amigó, Jorunn Sletten and Tony Debaerdemaeker, pp 891 DOI:10.1039/DT9900000891

The Lewis acidity of organylbismuth(III) compounds. New organylbismuth(III) dithiocarbamate chemistry. The crystal and molecular structure of bis(diethyidithiocarbamato)phenylbismuth(III) and bis(diethyldithiocarbamato)-[2-(2-pyridyl)phenyl]bismuth(III) Mushtaq Ali, William R. McWhinnie, Antony A. West and Thomas A. Hamor, pp 899 DOI:10.1039/DT9900000899

Orthotellurated derivatives of N,N-dimethylbenzylamine: crystal and molecular structures of [2-(dimethylaminomethyl)phenyl]tellurium(IV) tribromide and [2-(butyldichlorotelluro)benzyl]dimethylammonium chloride Harkesh B. Singh, Narsimhan Sudha, Antony A. West and Thomas A. Hamor, pp 907 DOI:10.1039/DT9900000907

Synthesis and characterization of mercury(II) complexes with 2,6-diacetylpyridine bis[N-methyl-N-(2-pyridyl)hydrazone]. X-Ray structure of chloro{2,6-diacetylpyridine bis[N-methyl-N-(2-pyridyl)hydrazone]}-mercury(II)–hexachlorodimercurate(II)(2/1) Gavino Chessa, Giampaolo Marangoni, Bruno Pitteri, Valerio Bertolasi, Valeria Ferretti and Gastone Gilli, pp 915 DOI:10.1039/DT9900000915

A comparative electrochemical study of thorium(IV) and uranium(IV) acetylacetonates Alain Vallat, Etienne Laviron and Alain Dormond, pp 921 DOI:10.1039/DT9900000921

Preparation and characterisation of [Pt(SeSN2)(PR3)2], [Pt(Se2N2)(PR3)2], [Pt(SeSN2H)(PR3)2]BF4, and [Pt(Se2N2H)(PR3)2]BF4 Ivan P. Parkin and J. Derek Woollins, pp 925 DOI:10.1039/DT9900000925

Dithiolene-like platinum complexes of the methyl esters of N3-lsopropyl and t-butyl substituted dithiocarbazic acids. Crystal and molecular structures of [Pt{NPriNC(S)SMe}2] and [Pt{NButNC(S)SMe}2] Mario Bonamico, Vincenzo Fares, Patrizia Imperatori, Lorenza Suber and Franco Tarli, pp 931 DOI:10.1039/DT9900000931

Synthesis and characterisation of the nickel(II) and copper(II) complexes of new quinquedentate (N3O2) ligands and the crystal structure of aqua[3,15-diacetyl-9-methyl-5,9,13-triazaheptadeca-3,14-diene-2,16-dionato-(2–)-N5N9N13O2O16]nickel(II) dihydrate James H. Cameron and Kevin J. McCullough, pp 935 DOI:10.1039/DT9900000935

Location of cation sites in a hydrated copper-exchanged chabazite by extended X-ray absorption fine structure Gianni Antonioli, Gilberto Vlaic, Giorgio Nardin and Lucio Randaccio, pp 943 DOI:10.1039/DT9900000943

Synthesis of dodecamolybdoantimonate(V) salts containing the Keggin structure Raj P. Singh, Radheshyam P. Khatri, Jean Dubois, Sushma S. Gaur and Mitsuo Abe, pp 947 DOI:10.1039/DT9900000947

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 97. Synthesis and crystal structures of the molybdenumditungsten compounds [MoW2{µ-, : 4-C(Ph)C(Ph)C(C6H4Me-4)C(C6H4Me-4)}(CO)6(-C5H5)2]·2CH2Cl2 and [MoW2(µ-C2Ph2){µ-C2(C6H4Me-4)2}(CO)4(-C5H5)2]·0.5CH2Cl2 Gabino A. Carriedo, Judith A. K. Howard, John C. Jeffery, Kathleen Sneller, F. Gordon A. Stone and A. Mala M. Weerasuria, pp 953 DOI:10.1039/DT9900000953

Copper(II) complexes with anti-inflammatory drugs as ligands. Molecular and crystal structures of bis(dimethyl sulphoxide)tetrakis(6-methoxy--methyl-2-naphthaleneacetato)dicopper(II) and bis(dimethyl sulphoxide)tetrakis[1-methyl-5-(p-toluoyl)-1H-pyrrole-2-acetato]dicopper(II) Cathrine Dendrinou-Samara, Dimitris P. Kessissoglou, George E. Manoussakis, Dimitris Mentzafos and Aristidis Terzis, pp 959 DOI:10.1039/DT9900000959

A ruthenium(IV) oxo complex that contains a tertiary diamine ligand Clare Ho, Chi-Ming Che and Tai-Chu Lau, pp 967 DOI:10.1039/DT9900000967

Systematic design of chemical oscillators. Part 56. Kinetics and mechanism of the oxidation of hexacyanoferrate(II) by aqueous bromine Kenneth Kustin, Irving R. Epstein and Reuben H. Simoyi, pp 971 DOI:10.1039/DT9900000971

Reaction of [{Cr(cp)(CO)3}2](cp =5-C5H5) with elemental phosphorus. Isolation of [Cr2(cp)2(P5)] as a thermolysis product and its X-ray crystal structure Lai Yoong Goh, Richard C. S. Wong, C. K. Chu and Trevor W. Hambley, pp 977 DOI:10.1039/DT9900000977

Rhodium(III) complexes of the ambidentate macrocycle 6,13-diamino-6,13-dimethyl-1,4,8,11-tetra-azacyclotetradecane. Crystal structure of the sexidentate complex Paul V. Bernhardt, Geoffrey A. Lawrance and Trevor W. Hambley, pp 983 DOI:10.1039/DT9900000983

A flexible framework obtained from oxidative additions upon the binuclear complex [Ir2(µ-pz)(µ-SBut)(CO)2{P(OMe)3}2]: preparation and X-ray structures of [Ir2(µ-pz)(µ-SBut)(µ-L)(CO)2{P(OMe)3}2] and [Ir2(µ-pz)(µ-SBut)(µ-L)I2(CO)2-{P(OMe)3}2](Hpz = pyrazole, L = dimethyl acetylenedicarboxylate) M. Teresa Pinillos, Anabel Elduque, Luis A. Oro, Fernando J. Lahoz, Flavio Bonati, Antonio Tiripicchio and Marisa Tiripicchio-Camellini, pp 989 DOI:10.1039/DT9900000989

Synthesis of a series of hexanuclear ruthenium carbido cluster alkynes under mild conditions: X-ray structure analyses of the complexes [Ru6C(CO)15(µ3-2-PhCCH)] and [Ru6C(CO)15(µ3-2-PhCCMe)] Simon R. Drake, Brian F. G. Johnson, Jack Lewis, Gráinne Conole and Mary McPartlin, pp 995 DOI:10.1039/DT9900000995

Comparative structural study of dimethyl(pyridine-2-thiolato)thallium(III) and dimethylbis(pyridine-2-thiolato)tin(IV) María V. Castańo, Alejandro Macías, Alfonso Castińeiras, Angeles Sánchez González, Emilia García Martínez, José S. Casas, José Sordo, Wolfgang Hiller and Eduardo E. Castellano, pp 1001 DOI:10.1039/DT9900001001

Mechanism of caesium ion exchange on potassium cobalt hexacyanoferrates(II) Jukka Lehto, Suvi Haukka, Risto Harjula and Merja Blomberg, pp 1007 DOI:10.1039/DT9900001007

Structural, magnetic, and optical studies of new mixed-valence copper(II)–platinum(IV) complexes with one-dimensional chain structures Hiroki Oshio, Koshiro Toriumi, Shunji Bandow, Kensuke Miyagawa and Susumu Kurita, pp 1013 DOI:10.1039/DT9900001013

Addition of hydroxide, alkoxide, and carboxylate anions to platinum-bonded ethylene Francesco P. Fanizzi, Francesco P. Intini, Luciana Maresca, Giovanni Natile and Francesco Gasparrini, pp 1019 DOI:10.1039/DT9900001019

Syntheses and structural characterizations of a series of Mo(W)–Cu–S compounds of bidentate dialkyldithiocarbamate ligands. Crystal structure of [NEt4]2[Mo2Cu5S6O2(Me2NCS2)3] Hanqin Liu, Rong Cao, Xinjian Lei, Daxu Wu, Guowei Wei, Zhiying Huang, Maochun Hong and Beisheng Kang, pp 1023 DOI:10.1039/DT9900001023

Systematic synthesis of triply bridged binuclear copper(I) complexes containing bis(diphenylphosphino)methane (dppm) bridging ligands: X-ray crystal structures of [Cu2(µ-dppm)2(µ-mpyO)]BF4 and [Cu2(µ-dppm)(µ-mpyO)2](mpyO = 6-methylpyridin-2-olate) Josefina Diez, Pilar Gamasa, José Gimeno, Maurizio Lanfranchi and Antonio Tiripicchio, pp 1027 DOI:10.1039/DT9900001027

Nickel nitrosyl complexes with diphosphines. The crystal and molecular structure of [(dppe)(ON)Ni(µ-dppe)Ni(NO)(dppe)][BF4]2(dppe = Ph2PCH2CH2PPh2) Alessandro Del Zotto, Antonio Mezzetti, Veronica Novelli, Pierluigi Rigo, Maurizio Lanfranchi and Antonio Tiripicchio, pp 1035 DOI:10.1039/DT9900001035

Synthesis and characterisation of binuclear and trinuclear organoimido complexes of tungsten-(VI) and -(V) and a binuclear tungsten(V) oxoanion. X-Ray crystal structures of [{WCl4(NEt)}2], [P(CH2Ph)Ph3][W3Cl7(NBut)3(µ-NPh)3], [P(CH2Ph)Ph3][W2Cl7(NR)2](R = Et or Ph), and [P(CH2Ph)Ph3][W2O2Cl7] Donald C. Bradley, R. John Errington, Michael B. Hursthouse and Richard L. Short, pp 1043 DOI:10.1039/DT9900001043

Silver-mediated epoxidations Karl Anker Jřrgensen and Erik Larsen, pp 1053 DOI:10.1039/DT9900001053

Low-spin iron(III) porphyrins encapsulated in aqueous detergent micelles: proton- and nitrogen-15 nuclear magnetic resonance studies Shyamalava Mazumdar, Okhil K. Medhi and Samaresh Mitra, pp 1057 DOI:10.1039/DT9900001057

Conversion of a µ3-alkylidyne into a µ3-acyl group at a trimetal centre; X-ray crystal structures of the phosphido bridged complexes [WFe2(µ3-CR)(µ-H)(µ-PEt2)(CO)6(PEt2H)(-C5H5)]·Et2O, [WFe2(µ3-CR)(µ-PPh2)2(CO)6(-C5H5)]·0.5 CH2Cl2, [WFe2(µ3-OCCH2R)(µ-PPh2)2(CO)5(-C5H5)], and [WFe2(µ-OCCH2R)(µ-PPh2)2(CO)6(PPh2H)(-C5H5)]·CH2Cl2(R = C6H4Me-4) John C. Jeffery and Julian G. Lawrence-Smith, pp 1063 DOI:10.1039/DT9900001063

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 1. Synthesis, structure, and protonation of dinitrogen-bridged complexes Jonathan R. Dilworth, Richard A. Henderson, Adrian Hills, David L. Hughes, Colin Macdonald, Alan N. Stephens and David R. M. Walton, pp 1077 DOI:10.1039/DT9900001077

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 2. Trimethylhydrazido(1–)-complexes: the reactivity and X-ray crystal structure of [Ta(NMeNMe2)(S2CNEt2)3]Br·CHCl3 Ferdia P. O'Flaherty, Richard A. Henderson and David L. Hughes, pp 1087 DOI:10.1039/DT9900001087

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 3. Protonation of [Nb(NNMeR)(S2CNEt2)3](R = Me or Ph) Richard A. Henderson and Kay E. Oglieve, pp 1093 DOI:10.1039/DT9900001093

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 4. The co-ordination isomers of NbCl₃(S₂CNEt₂)₂ and the X-ray crystal structure of [NbCl₃(S₂CNEt₂)₂]
Richard A. Henderson, David L. Hughes and Alan N. Stephens,Â
pp 1097 DOI:10.1039/DT9900001097

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 5. The kinetics and mechanism of the hydrazine-forming reactions between [{M(S2CNEt2)3}2(µ-N2)](M = Nb or Ta) and acid: rate-limiting protonation Richard A. Henderson, Susan H. Morgan and Alan N. Stephens, pp 1101 DOI:10.1039/DT9900001101

The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 6. The kinetics and mechanism of the hydrazine-forming reactions between [{Ta(S2CNEt2)3}2(µ-N2)] and HBr: cleavage of the binuclear unit Richard A. Henderson and Susan H. Morgan, pp 1107 DOI:10.1039/DT9900001107

Notes. Isolation and crystal structure of the trans isomer of (6,7,13,14,15,16,17,18,24,25,31,32,33,34,35,36-hexadecahydrotetrabenzo[e,m,s,a][1,14,15,18,8,11,22,25]tetraoxatetra-azacyclo-octacosine)di-isothiocyanatonickel(II) Harry Adams, Neil A. Bailey, David E. Fenton, Simon J. Kitchen and Peter A. Tasker, pp 1111 DOI:10.1039/DT9900001111

High-pressure conditions for improved synthesis of phthalocyanines Stephen J. Edmondson, Jon S. Hill, Neil S. Isaacs and Philip C. H. Mitchell, pp 1115 DOI:10.1039/DT9900001115

Synthesis and X-ray crystal structure of the bis(imino) cyclodiphosphazane, [(PhN)P(NMe2)(NPh)]2 Santhanathan S. Kumaravel, Setharampattu S. Krishnamurthy, T. Stanley Cameron and Anthony Linden, pp 1119 DOI:10.1039/DT9900001119

Standard enthalpies of formation of rubidium and ammonium acetates, and the barrier opposing ammonium ion rotation David A. Johnson and Kiki Warr, pp 1123 DOI:10.1039/DT9900001123

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX011

Issue 4

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX013

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP019

Synthesis and characterization of octamolybdates containing co-ordinatively bound salicylideneiminato and methioninato (MetO) ligands. Crystal structures of [NH3Pr]2[Mo8O22(OH)4(OC6H4CHNPr-2)2]·6MeOH and [Hmorph]4[Mo8O24(OH)2(MetO)2]·4H2O (morph = morpholine) Boris Kamenar, Branka Korpar-olig, Maja Penavi and Marina Cindri, pp 1125 DOI:10.1039/DT9900001125

Large-angle X-ray scattering study and magnetic properties of amorphous complexes [MM(cdta)]·n H2O (M, M= CoII, NiII, CuII, or ZnII; cdta =trans-cyclohexane-1,2-diamine-NNNN-tetra-acetate) M. Carmen Muńoz Roca, Daniel Beltran, Jose Antonio Real, Alain Mosset and Jean Galy, pp 1131 DOI:10.1039/DT9900001131

Potentiometric, calorimetric and spectroscopic study of complexation between copper(II), nickel(II), and cobalt(II) and L,L-dipeptides containing weakly or non-co-ordinating side chains L. Xiao, M. Jouini, B. T. Fan, G. Lapluye and J. Huet, pp 1137 DOI:10.1039/DT9900001137

Structural trends in phosphine-substituted [RuCoxRh3–xH(CO)12](x= 0–3) clusters. Crystal structures of [RuCo3H(CO)11(PR3)](PR3= PMe3 or PMe2Ph), [RuCo2RhH(CO)11(PMe2Ph)], [RuCoxRh3–xH(CO)10(PPh3)2](x= 1–2), and [RuRh3H(CO)11(PR3)](PR3= PMe3 or PMe2Ph) Jouni Pursiainen, Markku Ahlgren, Tapani A. Pakkanen and Jussi Valkonen, pp 1147 DOI:10.1039/DT9900001147

Structures and rearrangement reactions of oxaferretane (C2H4OFe): a theoretical approach Peter Swanstrřm and Karl Anker Jřrgensen, pp 1155 DOI:10.1039/DT9900001155

Lithiation of 2-Me3SiCHRC5H4N(R = H or SiMe3): influence of solvent on the nature of the product (from X-ray structure determinations) and asymmetric induction. A note on the lithiation of some analogous 3- and 4-methylpyridines Rocco I. Papasergio, Brian W. Skelton, Paul Twiss, Allan H. White and Colin L. Raston, pp 1161 DOI:10.1039/DT9900001161

Organoimido complexes of tungsten(IV) containing -olefin ligands. The X-ray crystal structure of dichloro(2-methylpropene)(phenylimido)bis-(trimethylphosphine)tungsten(IV), [WCl2(NPh)(Me2CCH2)(PMe3)2] George R. Clark, Alastair J. Nielson, Clifton E. F. Rickard and David C. Ware, pp 1173 DOI:10.1039/DT9900001173

Half-sandwich ruthenium complexes of a P–O bifunctional ligand. X-Ray crystal structure of [Ru(-C5Me5)(OC6H4PPh2){PPh2(C6H4OH)}] Massimo Canestrari, Bruno Chaudret, Françoise Dahan, Yong-Sheng Huang, René Poilblanc, Tag-Chong Kim and Michel Sanchez, pp 1179 DOI:10.1039/DT9900001179

Intercalation and co-ordination of ammonia and 1,2-diaminoethane into cobalt(II)-, nickel(II)-, copper(II)-, and vanadium(IV)-exchanged -tin phosphate Lucilla Alagna, Anthony A. G. Tomlinson, Enrique Rodriguez-Castellon, Pascual Olivera Pastor and Sebastian Bruque, pp 1183 DOI:10.1039/DT9900001183

Pillar chemistry. Part 5. Intercalation of 2,2-bipyridine, 1,10-phenanthroline, and 2,9-dimethyl-1,10-phenanthroline into -zirconium phosphate and formation of interlayer copper(II) complexes Carla Ferragina, Maria A. Massucci and Anthony A. G. Tomlinson, pp 1191 DOI:10.1039/DT9900001191

Reactions of isocyanide complexes of palladium(II) and platinum(II) with azetidine: synthesis of acyclic diaminocarbene derivatives and X-ray structure of [PdCl(PMe2Ph)(CH2CH2CH2NH){C(NCH2CH2CH2)NHC6H4OMe-p}]Cl·CH2Cl2 Roberta Bertani, Mirto Mozzon, Franco Benetollo, Gabriella Bombieri and Rino A. Michelin, pp 1197 DOI:10.1039/DT9900001197

Kinetics of oxidation of ethanol, isopropyl alcohol, and benzyl alcohol by [ethylenebis(biguanide)]silver(III) cation in aqueous perchloric acid solutions Rupendranath Banerjee, Amitava Das and Subrata Dasgupta, pp 1207 DOI:10.1039/DT9900001207

Synthesis of some cationic 16- and 18-electron nickel alkyl phosphine complexes containing bidentate ligands: ligand-dependent square-planar, trigonal-bipyramidal, and square-pyramidal co-ordination geometries, their reactions with CO and alkynes, and the crystal structure of [Ni(CH2SiMe3)(PMe3)3]BF4 Manfred Bochmann, Ian Hawkins, Michael B. Hursthouse and Richard L. Short, pp 1213 DOI:10.1039/DT9900001213

Photochemistry of some group 6A and 8 metal–metal bonded cyclopentadienylcarbonyl dimers in poly(vinyl chloride) films at 12–298 K Richard H. Hooker and Antony J. Rest, pp 1221 DOI:10.1039/DT9900001221

Photochemistry of some (5-cyclopentadienyl)carbonylchloro complexes of molybdenum, tungsten, iron, and ruthenium in frozen gas matrices at ca. 12 K and in poly(vinyl chloride) films at ca. 12–298 K Richard H. Hooker, Khalil A. Mahmoud and Antony J. Rest, pp 1231 DOI:10.1039/DT9900001231

Preparation, properties, and reactions with sulphur dioxide of triphenylphosphine oxide complexes of manganese(II) thiocyanate. Crystal structures of [{Mn(OPPh3)2(NCS)(µ-NCS)}2], [Mn(OPPh3)4(NCS)2], and (PPh3O)(PPh3OH)(HSO4), a derivative of sulphuric acid formed under ambient air oxidation of sulphur dioxide K. Al-Farhan, Brian Beagley, Oraib El-Sayrafi, George A. Gott, Charles A. McAuliffe, Philomena P. Mac Rory and Robin G. Pritchard, pp 1243 DOI:10.1039/DT9900001243

Substitution of pyridine ligands from platinum(II) iodo complexes by dimethyl sulphoxide: crystal structure of trans-(3,5-dimethylpyridine)(dimethyl sulphoxide-S)di-iodoplatinum Tam T. B. Ha, Franz L. Wimmer, Jean-Pierre Souchard, Neil P. Johnson and Joël Jaud, pp 1251 DOI:10.1039/DT9900001251

Kinetics and mechanism of the oxidation of tris(2,2-bipyridyl)- and tris(1,10-phenanthroline)-iron(II) complexes with peroxodisulphate in acetate buffers Kamlesh Arora, Anand P. Bhargava and Yugul K. Gupta, pp 1257 DOI:10.1039/DT9900001257

Role of trace metal ions. Kinetics and mechanism of the copper(II)-catalysed oxidation of ascorbic acid with peroxodiphosphate in acetate buffers Dileep K. Mishra, T. Peter Amala Dhas, Prem D. Sharma, Anand P. Bhargava and Yugul K. Gupta, pp 1265 DOI:10.1039/DT9900001265

Metal complexes of molecular clefts. The synthesis and X-ray crystal structures of a mononuclear barium and four binuclear silver(I) complexes of bibracchial tetraimine Schiff-base macrocycles Harry Adams, Neil A. Bailey, W. Daniel Carlisle, David E. Fenton and Gentilina Rossi, pp 1271 DOI:10.1039/DT9900001271

Solvent effects on thermodynamic and electrochemical parameters: lanthanide cryptates in acetonitrile Isabella Marolleau, Jean-Paul Gisselbrecht, Maurice Gross, Françoise Arnaud-Neu and Marie-José Schwing-Weill, pp 1285 DOI:10.1039/DT9900001285

Allylic alkylation of complexed cyclo-octatetraene (cot)via the reaction of [Fe{P(OMe)3}(NO)2(3-allyl)]+ with [M(CO)3(4-cot)](M = Fe or Ru) derivatives; X-ray structure of [Ru(CO)2(PPh3)(2,3-C8H8R)][PF6]·0.5CH2Cl2[R = CH2C(Me)CH2] Neil G. Connelly, Mark Gilbert, A. Guy Orpen and John B. Sheridan, pp 1291 DOI:10.1039/DT9900001291

Comparison of the formation rate constants of some chromium(II) and copper(II) complexes Károly Micskei and István Nagypál, pp 1301 DOI:10.1039/DT9900001301

Studies on [Ru3(CO)12]-catalysed homogeneous transfer hydrogenation reactions; X-ray structure of [Ru4(CO)10Cl12(OPh)2] Sumit Bhaduri, Niteen Sapre, Krishna Sharma, Peter G. Jones and Gene Carpenter, pp 1305 DOI:10.1039/DT9900001305

Modelling the reduction of nitrobenzene with [Ru3(CO)12] as a homogeneous catalyst. X-Ray structures of [Ru3H(CO)10(PhNH)] and [N(PPh3)2][Ru3H(CO)9(PhN)] Sumit Bhaduri, Hanif Khwaja, Niteen Sapre, Krishna Sharma, Amitabha Basu, Peter G. Jones and Gene Carpenter, pp 1313 DOI:10.1039/DT9900001313

Crystallographic and molecular mechanics study of the copper perchlorate complex of a larger reinforced macrocycle Peter W. Wade and Robert D. Hancock, pp 1323 DOI:10.1039/DT9900001323

Substituted o-quinodimethane complexes of ruthenium(0) Nigel J. Simpson and David J. Cole-Hamilton, pp 1329 DOI:10.1039/DT9900001329

cis- and trans-Dichloro-derivatives of six- and seven-co-ordinate zirconium and hafnium bonded to quadridentate Schiff-base ligands. Crystal structures of [Zr(acen)Cl2(thf)], [M(salphen)Cl2(thf)]·0.5thf, [M(acen)Cl2], (M = Zr or Hf), and [Zr(msal)Cl2][acen =N,N-ethylenebis(acetylacetoneiminate), salphen =N,N-o-phenylenebis(salicylideneiminate), msal =N-methylsalicylideneiminate, and thf = tetrahydrofuran] Fabio Corazza, Euro Solari, Carlo Floriani, Angiola Chiesi-Villa and Carlo Guastini, pp 1335 DOI:10.1039/DT9900001335

Polydentate ligand exchange via formation of a dimetallic complex. Crystal structures of [(thf)Fe(acen)MCl2](M = Fe or Zn), [ClFe(salphen)FeCl(thf)2], [Ti(acen)(thf)2][CoCl3(thf)], and [Ti(acen)(thf)2]2[Fe3Cl8(thf)2][acen =N,N-ethylenebis(acetylacetoneiminate), salphen =N,N-o-phenylenebis(salicylideneiminate), and thf = tetrahydrofuran] Euro Solari, Fabio Corazza, Carlo Floriani, Angiola Chiesi-Villa and Carlo Guastini, pp 1345 DOI:10.1039/DT9900001345

Molecular and electronic structure of the complexes formed by the Schiff base N-(o-hydroxybenzylidene)ferroceneamine with CoII, NiII, CuII, and ZnII Michela Bracci, Claudio Ercolani, Barbara Floris, Mauro Bassetti, Angiola Chiesi-Villa and Carlo Guastini, pp 1357 DOI:10.1039/DT9900001357

Selectivity in transport Kenneth I. Kinnear, Joyce C. Lockhart and David J. Rushton, pp 1365 DOI:10.1039/DT9900001365

The acceptor properties of some pentafluorophenylphosphorus(V) species Rusmidah Ali and Keith B. Dillon, pp 1375 DOI:10.1039/DT9900001375

Binuclear copper(II) complexes bridged by oxamidate and dithio-oxamidate groups. Synthesis, structure, and magnetism Hisashi kawa, Naohide Matsumoto, Masayuki Koikawa, Keiko Takeda and Sigeo Kida, pp 1383 DOI:10.1039/DT9900001383

Synthesis, spectroscopy, and electrochemistry of homo- and hetero-leptic ruthenium(II) complexes of new pyrazole-containing bidentate ligands Peter J. Steel and Edwin C. Constable, pp 1389 DOI:10.1039/DT9900001389

The transient template effect: chromium(III)-directed syntheses of metal-free macrocyclic ligands and crystal structure of 1,11-bis(2-hydroxyethyl)-4,8;12,16;17,21-trinitrilo-1,2,10,11-tetra-azacyclohenicosa-2,4,6,9,12,14,18,20-octaene hydrochloride tetrahydrate Lap-Yan Chung, Edwin C. Constable, Adrian R. Dale, Muhammed S. Khan, Michael C. Liptrot, Jack Lewis and Paul R. Raithby, pp 1397 DOI:10.1039/DT9900001397

Synthesis and co-ordination behaviour of 6,6-bis(2-pyridyl)-2,2 : 4,4 : 2,2-quaterpyridine; back-to-back 2,2 : 6,2-terpyridine Edwin C. Constable and Michael D. Ward, pp 1405 DOI:10.1039/DT9900001405

Complexes of Tcv and TcIII with tridentate Schiff bases derived from S-methyl dithiocarbazate. Crystal structures of chloro[S-methyl 3-(2-hydroxy-1-naphthylmethylene)dithiocarbazato(2-)]oxotechnetium(V) and dichloro[S-methyl 3-(2-hydroxybenzylidene)dithiocarbazato(1-)]bis(triphenylphosphine)-technetium(III) Andrea Marchi, Roberto Rossi, Luciano Magon, Adriano Duatti, Roberto Pasqualini, Valeria Ferretti and Valerio Bertolasi, pp 1411 DOI:10.1039/DT9900001411

Theoretical versus experimental charge and spin-density distributions in trans-[Ni(NH3)4(NO2)2] Graham S. Chandler, Robert J. Deeth, Brian N. Figgis and Robin A. Phillips, pp 1417 DOI:10.1039/DT9900001417

Concept of the H(+) H(–) interaction. A low-temperature neutron diffraction study of cis-[IrH(OH)(PMe3)4]PF6 Raymond C. Stevens, Robert Bau, David Milstein, Ofer Blum and Thomas F. Koetzle, pp 1429 DOI:10.1039/DT9900001429

Synthesis and conformation of 9,10-dihydroplatina-anthracenes: nuclear magnetic resonance and X-ray crystal structure studies Nathaniel W. Alcock, Karen H. Bryars and Paul G. Pringle, pp 1433 DOI:10.1039/DT9900001433

Ten-vertex metallaborane chemistry: synthesis and characterization of some ortho-cycloboronated nido-5- and -6-iridadecaboranes; crystal structures of [5-H-5-(PPh3)-5-(PPh2-o-C6H4)-nido-5-IrB9H12-2] and [5-H-5,7-(PPh3)2-5-(PPh2-o-C6H4)-nido-5-IrB9H12-2]] Jonathan Bould, Janet E. Crook, Norman N. Greenwood, John D. Kennedy and Mark Thornton-Pett, pp 1441 DOI:10.1039/DT9900001441

Ten-vertex metallaborane chemistry: facile, thermally induced, nidoisocloso cluster-closure oxidation reactions in iridadecaborane clusters Jonathan Bould, Norman N. Greenwood and John D. Kennedy, pp 1451 DOI:10.1039/DT9900001451

Synthesis, reactivity, and X-ray crystal structure of [Rh{C6H4N(O)O-2}(-C5Me5)Cl] José Vicente, José A. Abad, Fernando J. Lahoz and Francisco J. Plou, pp 1459 DOI:10.1039/DT9900001459

Synthesis, X-ray structure, and nuclear magnetic resonance (1H and 13C) studies of ruthenium(II) complexes containing pyrazolyl ligands Daniel Carmona, Joaquina Ferrer, Luis A. Oro, María C. Apreda, Concepción Foces-Foces, Félix H. Cano, José Elguero and M. a Luisa Jimeno, pp 1463 DOI:10.1039/DT9900001463

Dimer species in aqueous solutions of m–phenylenediamine-N,N,N,N-tetra-acetic acid (m-H4pdta) with copper(II) and of pyridine-2,6-diamine-N,N,N,N-tetra-acetic acid (2,6-H4pydta) with nickel(II). X-Ray crystal structures of Na4[Cu2(m-pdta)2]·18H2O, Na4[Co2(m-pdta)2]·10H2O, and Na4[Ni2(2,6-pydta)2]·8H2O Alfredo Mederos, Pedro Gili, Sixto Domínguez, Angel Benítez, Ma Soledad Palacios, Margarita Hernández-Padilla, Pedro Martín-Zarza, Matías L. Rodríguez, Catalina Ruíz-Pérez, Fernando J. Lahoz, Luis A. Oro, Felipe Brito, Juan M. Arrieta, Metaxia Vlassi and Gabriel Germain, pp 1477 DOI:10.1039/DT9900001477

Trinuclear angular aggregates of rhodium: synthesis and crystal structures of [Rh3(µ3-SC5H4N)2(CO)6][ClO4](SC5H4N = pyridine-2-thiolate) and [Rh3(µ3-C7H4NS2)2(CO)2(PPh3)2(tfbb)][ClO4](C7H4NS2= benzothiazole-2-thiolate, tfbb = tetrafluorobenzobarrelene) Miguel A. Ciriano, Jesús J. Pérez-Torrente, Fernando Viguri, Fernando J. Lahoz, Luis A. Oro, Antonio Tiripicchio and Marisa Tiripicchio-Camellini, pp 1493 DOI:10.1039/DT9900001493

Tris(pentafluorophenyl) neutral and anionic five-co-ordinate complexes of rhodium(III). Crystal structures of [Rh(C6F5)3(PEt3)2] and [Rh(C6F5)3(AsPh3)2] Maria P. Garcia, M a Victoria Jiménez, Fernando J. Lahoz, Luis A. Oro, Antonio Tiripicchio and José A. López, pp 1503 DOI:10.1039/DT9900001503

Notes. Nuclear magnetic resonance evidence for three different isomers of [Ru3(µ-H)(µ-bzim)(CO)9(PPh3)](bzim = benzimidazolate). Crystal structure of [Ru3(µ-H)(µ-bzim)(CO)10]·Me2CO Maria Angela Pellinghelli, Antonio Tiripicchio, Javier A. Cabeza and Luis A. Oro, pp 1509 DOI:10.1039/DT9900001509

Cobalt(III) complexes of neutral selenium and tellurium donor ligands: synthesis and nuclear magnetic resonance studies Jennifer L. Brown, Tim Kemmitt and William Levason, pp 1513 DOI:10.1039/DT9900001513

Reaction of N(SCl)2+ salts with tin(II) chloride: a new preparative route to salts of the SNS+ cation Arthur J. Banister and Jeremy M. Rawson, pp 1517 DOI:10.1039/DT9900001517

Molecular structure of dimethyl(2,4-pentanedionato)gold(III) Shuzo Shibata, Kinya Iijima and Thomas H. Baum, pp 1519 DOI:10.1039/DT9900001519

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX015

Issue 5

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX017

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP023

Linear co-ordinative bonding at oxygen: a spectroscopic and structural study of phosphine oxide-Group 13 Lewis acid adducts Neil Burford, Bruce W. Royan, Rupert E. v. H. Spence, T. Stanley Cameron, Anthony Linden and Robin D. Rogers, pp 1521 DOI:10.1039/DT9900001521

Spectroscopic studies on matrix-isolated molybdenum pentachloride Alan K. Brisdon, John T. Graham, Eric G. Hope, Delyth M. Jenkins, William Levason and J. Steven Ogden, pp 1529 DOI:10.1039/DT9900001529

Synthesis, properties, and crystal structures of new mono- and homo-binuclear uranyl(VI) complexes with compartmental Schiff bases Umberto Casellato, Paolo Guerriero, Sergio Tamburini, Pietro A. Vigato and Rodolfo Graziani, pp 1533 DOI:10.1039/DT9900001533

Ferrocenyl ligands. Part 1. An analysis of the structures of substituted ferrocenylphosphines to aid in the understanding of the ligand bonding. The crystal and molecular structure of diferrocenylphenylphosphine Andrew Houlton, Roger M. G. Roberts, Jack Silver and Michael G. B. Drew, pp 1543 DOI:10.1039/DT9900001543

Complex formation between transition metals and DL-aspartic acid--hydroxamic acid (N-hydroxyasparagine) Etelka Farkas and Péter Buglyó, pp 1549 DOI:10.1039/DT9900001549

Reactivity of [Pt(CH2X)2(Ph2PCH2PPh2-PP)](X = Cl, Br, or I): four- to five-membered ring expansions. Crystal structure of [bis(diphenylphosphino)-methane-PP]bis(chloromethyl)platinum(II) Nathaniel W. Alcock, Paul G. Pringle, Paola Bergamini, Silvana Sostero and Orazio Traverso, pp 1553 DOI:10.1039/DT9900001553

Ruthenium in isomeric S4P2 co-ordination: metal redox and geometrical reorganisation Nilkamal Bag, Goutam Kumar Lahiri and Animesh Chakravorty, pp 1557 DOI:10.1039/DT9900001557

Synthesis of cis and trans isomers of N,N-dimethyl-1,2-ethanediamine complexes of nickel(II) nitrate and solid-phase thermal cis-to-trans isomeric transformation Subratanath Koner, Ashutosh Ghosh and Nirmalendu Ray Chaudhuri, pp 1563 DOI:10.1039/DT9900001563

He I photoelectron spectra of unstable boron isocyanates; electronic and geometric structures in the BClx(NCO)3 -x series Mehran Alaee, Peter Hofstra, Colin Kirby and Nicholas P. C. Westwood, pp 1569 DOI:10.1039/DT9900001569

Parametric analysis of crystal-field effects in rare-earth-metal disilicates doped with trivalent europium Christian Chateau, Jorma Hölsä and Pierre Porcher, pp 1575 DOI:10.1039/DT9900001575

Side-chain effect on the co-ordination behaviour of glycine derivatives toward copper(II), crystal structure of bis(µ-N-tritylglycinato-O)-bis[(2,2-bipyridine)(N-tritylglycinato-O)copper(II)] Ledi Menabue and Monica Saladini, pp 1581 DOI:10.1039/DT9900001581

Sulphonamide nitrogen-containing N-protected amino acids interacting with palladium(II). Polarographic and pH-metric investigation in aqueous solution Giovanna Battistuzzi Gavioli, Marco Borsari, Ledi Menabue, Monica Saladini, Gian Carlo Pellacani and Marco Sola, pp 1585 DOI:10.1039/DT9900001585

Synthesis and reactions of co-ordinatively unsaturated µ3-alkylidyne clusters; X-ray crystal structures of the phosphido bridged complexes [WFe2(µ3-CR)(µ-H)(µ-PPh2)(CO)6(-C5H5)]and[WFe2(µ3-CR){µ-C(O)C(Me)CHMe}(µ-PEt2)(CO)5(-C5H5)](R = C6H4Me-4) John C. Jeffery and Julian G. Lawrence-Smith, pp 1589 DOI:10.1039/DT9900001589

Binuclear copper(II) complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane: synthesis, spectroscopy, and spin coupling across multiple-atom bridges of variable length (3.6-7.6 Å) Phalguni Chaudhuri and Karen Oder, pp 1597 DOI:10.1039/DT9900001597

Reactivity of bis(diphenylphosphino)methane in cationic octahedral iron(II) derivatives. X-Ray structure of mer-[FeCl{(Ph2P)2 C(AuPPh3)2}(CNPh)3]PF6 V. Riera, J. Ruiz, X. Solans and E. Tauler, pp 1607 DOI:10.1039/DT9900001607

Reactivity of a cyclothiaphosphazene towards Grignard reagents. Crystal structure of the 1 : 1 adduct of the Bi(cyclothiaphosphazene)[NPMe(NSOPh)2]2 and benzene Jan K. Herrema, Andries P. Jekel, Herman Winter, Johan C. van de Grampel, Auke Meetsma, Jan L. de Boer and Anthony L. Spek, pp 1613 DOI:10.1039/DT9900001613

Synthesis and structural study of neutral mononuclear and anionic binuclear 2,4,6-trifluorophenyl derivatives of palladium(II). Crystal structure of [P(CH2Ph)Ph3]2[(C6F3H2)2Pd(µ-SCN)(µ-NCS)Pd(C6F3H2)2] Gregorio López, Gabriel Garcia, Maria D. Santana, Gregorio Sánchez, José Ruiz, Juan A. Hermoso, Angel Vegas and Martin Martínez-Ripoll, pp 1621 DOI:10.1039/DT9900001621

A comparison of methods for estimating equilibrium constants in ion exchange Erik Högfeldt, pp 1627 DOI:10.1039/DT9900001627

Stopped-flow study of the reaction of [Cr(H2O)6]3+ with H3AsO4-H2AsO4- and the much faster reaction of [Cr(NH3)5(H2O)]3+: substitution at arsenate(V) Miguel Ferrer, Manuel Martinez and Mari-Angel Pitarque, pp 1629 DOI:10.1039/DT9900001629

Interaction of related open-chain and macrocyclic ligands incorporating oxygen- and nitrogen-donor atoms with COII, NiII, CuII, ZnII, and CdII. X-Ray structures of a seven-co-ordinate zinc(II) complex as well as seven- and eight-co-ordinate cadmium(II) derivatives Kenneth R. Adam, Susan Donnelly, Anthony J. Leong, Leonard F. Lindoy, Brian J. McCool, Alan Bashall, Michael R. Dent, Brian P. Murphy, Mary McPartlin, David E. Fenton and Peter A. Tasker, pp 1635 DOI:10.1039/DT9900001635

Photoreaction of [MoH4(Ph2PCH2CH2PPh2)2] with allyl carbonates to give hydridocarbonatomolybdenum(II) complexes; X-ray crystal structure of a seven-co-ordinate molybdenum(II) complex [MoH(O2COEt)(Ph2PCH2CH2PPh2)2] Takashi Ito, Kazuaki Hamamoto, Susumu Kurishima and Kohtaro Osakada, pp 1645 DOI:10.1039/DT9900001645

Heterobinuclear nitrosyl complexes. Part 2. Crystal structures of [(Ph3P)2(NO)Ir(µ-dppn)(µ-Cl)PdCl][PF6]2 and [(Ph3P)Cl2Ir(µ-NO)(µ-dppn)PdCl]PF6[dppn = 3,6-bis(2-pyridyl)pyridazine] Antonio Tiripicchio, Marisa Tiripicchio Camellini, Francesco Neve and Mauro Ghedini, pp 1651 DOI:10.1039/DT9900001651

Ligand-bridged homo- and hetero-binuclear carbonyl polypyridyl complexes of ReI: syntheses, electronic spectra, redox, and luminescence behaviour Kuppuswamy Kalyanasundaram and Mohammad K. Nazeeruddin, pp 1657 DOI:10.1039/DT9900001657

Some dimethyl ether adducts of silyl and germyl halides Alexander J. Blake, Stephen Cradock, Keith C. Franklin and Stuart G. Fraser, pp 1663 DOI:10.1039/DT9900001663

A convenient preparation of 2,2:6,2:6,2-quaterpyridine; the crystal and molecular structures of 2,2:6,2:6,2-quaterpyridine and bis(acetonitrile)-(2,2:6,2:6,2-quaterpyridine)nickel(II) hexafluorophosphate-acetonitrile(1/1) Edwin C. Constable, Susan M. Elder, John Healy and Derek A. Tocher, pp 1669 DOI:10.1039/DT9900001669

Synthesis and characterization of bismuth bromide-arene complexes. X-Ray structure of bismuth(III) bromide-fluoranthene-p-xylene (4/2/1) Luigi Pietro Battaglia, Anna Bonamartini Corradi, Ida Maria Vezzosi and Franca Aline Zanoli, pp 1675 DOI:10.1039/DT9900001675

Synthesis of some [1,2-bis(alkoxycarbonyl)ethyl]ruthenium(II) complexes and their catalytic activities for cis-trans isomerization of dialkyl maleates Katsuma Hiraki, Naoyuki Ochi, Hiroko Takaya, Yoshio Fuchita, Yoshiharu Shimokawa and Hideki Hayashida, pp 1679 DOI:10.1039/DT9900001679

Crystallographic characterization of the polyoxotungstate [Eu3(H2O)3(SbW9O33)(W5O18)3]18- and energy transfer in its crystalline lattices Toshihiro Yamase, Haruo Naruke and Yoh Sasaki, pp 1687 DOI:10.1039/DT9900001687

Platinum metal complexes of potentially chelating alkene-sulphur and alkene-selenium ligands. The synthesis by chalcogen dealkylation and X-ray structures of the dimeric complexes [{PtI(SCH2CH2CMeCH2)}2] and [{PtI(PPh3)(SCH2CH2CMeCH2)}2], and a dynamic nuclear magnetic resonance study of [{PtI(L)(SCH2CH2CMeCH2)}2][L = PPh3, PPh2Me, or As(CH2SiMe3)3] Edward W. Abel, David G. Evans, Julian R. Koe, Michael B. Hursthouse, Mohammed Mazid, Mary F. Mahon and Kieran C. Molloy, pp 1697 DOI:10.1039/DT9900001697

Behaviour of [Ru2(CO)4({µ-MeCO2-O,O)2(PBun3)2] in the presence of hydrogen: synthesis and X-ray structure of polynuclear ruthenium carbonyl hydrides containing an encapsulated phosphide ligand Piero Frediani, Mario Bianchi, Antonella Salvini, Franco Piacenti, Sandra Lanelli and Mario Nardelli, pp 1705 DOI:10.1039/DT9900001705

Synthesis, spectroscopy, and photochemistry of bis[bis(diphenylphosphino)methane]bis(2,5-di-isocyano-2,5-dimethylhexane)dirhodium(I) Chi-Ming Che, Wai-Man Lee, Hoi-Lun Kwong, Vivian Wing-Wah Yam and Kar-Cheong Cho, pp 1717 DOI:10.1039/DT9900001717

Characterization by nuclear magnetic resonance spectroscopy, ferron assay, and acidification of partially neutralized aluminium solutions Cherkaoui Changui, William E. E. Stone, Leon Vielvoye and Jean-Marie Dereppe, pp 1723 DOI:10.1039/DT9900001723

Manganese(II) and iron(III) complexes of the tridentate ligands bis(benzimidazol-2-ylmethyl)-amine (L1) and -methylamine (L2). Crystal structures of [MnL1(CH3CO2)2], [FeL2Cl3], and [Fe2L12(µ-O){µ-(CH3)3CCO2}2][ClO4]2 Harry Adams, Neil A. Bailey, Jonathan D. Crane, David E. Fenton, Jean-Marc Latour and John M. Williams, pp 1727 DOI:10.1039/DT9900001727

Notes. Hydrido(benzochalcogenadiazole) complexes of ruthenium: crystal structure of [RuCl(H)(CO)(PPh3)(SN2C6H4)] Nathaniel W. Alcock, Anthony F. Hill and Mark S. Roe, pp 1737 DOI:10.1039/DT9900001737

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX019

Issue 6

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX021

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP027

Synthesis, crystal structure, and quasi-reversible dioxygen binding of [Cu2(tpmc)]X2[tpmc = 1,4,8,11-tetrakis(2-pyridylmethyl)-1,4,8,11-tetra-azacyclotetradecane; X = ClO4, PF6, or CF3SO3] Eiji Asato, Shinji Hashimoto, Naohide Matsumoto and Sigeo Kida, pp 1741 DOI:10.1039/DT9900001741

Synthesis and crystal structures of the dimetal compounds [CoRh(CO)2(PPh3)(4-C4Me4)(5-C2B9H11)], [Rh2(CO)2(PPh3)2(5-C2B9H11)], and [RhIrH(µ- : 5-C2B9H10)(CO)3(PPh3)2] José R. Fernandez, Gareth F. Helm, Judith A. K. Howard, Massimino U. Pilotti and F. Gordon A. Stone, pp 1747 DOI:10.1039/DT9900001747

Effects of ring size on thermodynamic and kinetic properties of copper(II)-diaminodiamide complexes in aqueous solution Ching-Hohn Len and Chung-Sun Chung, pp 1755 DOI:10.1039/DT9900001755

Iridium thioether chemistry: the synthesis and structures of [IrL2][PF6]3 and [IrHL2][PF6]2(L = 1,4,7-trithiacyclononane) Alexander J. Blake, Robert O. Gould, Alan J. Holder, Timothy I. Hyde, Gillian Reid and Martin Schröder, pp 1759 DOI:10.1039/DT9900001759

Kinetics of 1 : 1 NCS- for H2O substitution on WIV of [W3(µ3-S)(µ-S)3(H2O)9]4+ and [W3(µ3-S)(µ-O)3(H2O)9]4+: the effect of replacing core oxo by sulphido ligands and comparisons with MoIV3 Mohamed Nasreldin, Ade Olatunji, Paul W. Dimmock and A. Geoffrey Sykes, pp 1765 DOI:10.1039/DT9900001765

Synthesis and crystal structure of new polynuclear rhodium complexes formed by reaction of bis(-ethylene)(5-indenyl)rhodium with t-butylphospha-acetylene Paul Binger, Bruno Biedenbach, Richard Mynott, Reinhard Benn, Anna Rufiska, Peter Betz and Carl Krüger, pp 1771 DOI:10.1039/DT9900001771

Reactions of ruthenium(II)-co-ordinated phenyl phosphines: synthesis and X-ray crystal structures of the orthometallated complexes [Ru(C6H4PR1R2)(CH2SiMe3)(6-C6Me6)](R1= R2= Ph; R1= Ph, R2= Me; R1= R2= Me) and of [{Ru(CH2SiMe3)2(µ-,6-PMe2Ph)}2] containing bridging dimethylphenylphosphine ligands Pietro Diversi, Giovanni Ingrosso, Antonio Lucherini, Fabio Marchetti, Victor Adovasio and Mario Nardelli, pp 1779 DOI:10.1039/DT9900001779

First chelate complexes of 4-mercapto-1-methylpiperidine. Synthesis and characterization of [{M(µ-SC5H9NMe)X}2](M = PdII, X = Cl, Br, or I; M = PtII, X = Br or I). Crystal and molecular structure of [{Pt(µ-SC5H9NMe)Br}2] José-Antonio Ayllón, Pilar González-Duarte, Carles Miravitlles and Elies Molins, pp 1793 DOI:10.1039/DT9900001793

Migration of aryl and methyl onto carbonyl in iodorhodium(III) complexes Mauro Bassetti, Glenn J. Sunley, Francesco P. Fanizzi and Peter M. Maitlis, pp 1799 DOI:10.1039/DT9900001799

Preparation and crystal structure of di-µ-acetato-µ-hydroxo-hexa(ethyl acetate)dialuminium tris(tetrachloroaluminate) Piotr Sobota, Muhi O. Mustafa, Józef Utko and Tadeusz Lis, pp 1809 DOI:10.1039/DT9900001809

Arene derivatives of zirconium(II) and hafnium(II) Fausto Calderazzo, Piersandro Pallavicini and Guido Pampaloni, pp 1813 DOI:10.1039/DT9900001813

Metallaheteroborane chemistry. Part 6. Synthesis of closo-[2-(-ligand)-1,2-TeMB10H10] complexes with M(-ligand)= Rh(5-C5Me5)(1), Ru(6-p- MeC6H4Pri)(2), Ru(6-C6Me6)(3), and of nido-[6-(6-C6Me6)-8-(OEt)-6-RuB9H12](4), their characterisation by nuclear magnetic resonance spectroscopy and, for (1) and (3), by X-ray crystallography J. Chem. Soc., Dalton Trans. DOI:10.1039/DT9900001819

Metallaheteroborane chemistry. Part 7. Synthesis, crystal structure, and characterisation of two dinuclear rhodatelluraboranes, [{(PPh3)2RhTeB10H10}2] and [(PPh3)(CO)Rh2Te2B20H20] J. Chem. Soc., Dalton Trans. DOI:10.1039/DT9900001831

Synthesis and study of a mixed-ligand ruthenium(II) complex in its ground and excited states: bis(2,2-bipyridine)(dipyrido[3,2-a : 2,3-c]phenazine-N4N5)ruthenium(II) Edmond Amouyal, Abdulrazzak Homsi, Jean-Claude Chambron and Jean-Pierre Sauvage, pp 1841 DOI:10.1039/DT9900001841

On the relationship between crystallographic and spectroscopic evidence of dynamic processes in the solid state. The case of the osmium cluster helicopters Dario Braga, Fabrizia Grepioni, Brian F. G. Johnson, Jack Lewis and Marcia Martinelli, pp 1847 DOI:10.1039/DT9900001847

Metallacyclic complexes. Part 4. Synthesis of platinathietane-3-oxide complexes, and the single-crystal X-ray structure of [Pt{CH(COPh)S(O)CH(COPh)}(PPh3)2]·2CH2Cl2 William Henderson, Raymond D. W. Kemmitt, Lesley J. S. Prouse and David R. Russell, pp 1853 DOI:10.1039/DT9900001853

Complexes of aminophosphonates. Part 6. Copper(II) complexes of some catecholaminophosphonic acids J. Balla, T. Kiss, M. Jezowska-Bojczuk, H. Kozlowski and P. Kafarski, pp 1861 DOI:10.1039/DT9900001861

Synthesis of chiral atropoisomeric square-planar nickel(II) and copper(II) complexes formed by macrocyclic ligands containing pendant polyether groups and a quaternary ammonium group Yuri N. Belokon', Ludmila K. Pritula, Vitali I. Tararov, Vladimir I. Bakhmutov, Yuri T. Struchkov, Tatiana V. Timofeeva and Vasili M. Belikov, pp 1867 DOI:10.1039/DT9900001867

Chiral complexes of copper(II), containing polyether podands and a quaternary ammonium group, as potential receptors and carriers of -amino acid anions Yuri N. Belokon', Ludmila K. Pritula, Vitali I. Tararov, Vladimir I. Bakhmutov, Dimitri G. Gusev, Marina B. Saporovskaya and Vasili M. Belikov, pp 1873 DOI:10.1039/DT9900001873

Tri-µ-bromo-bis[tribromoruthenate(III)] salts: a synthetic, structural, spectroscopic, and electrochemical study Denise Appleby, Peter B. Hitchcock, Kenneth R. Seddon, Janet E. Turp, Jalal A. Zora, Charles L. Hussey, John R. Sanders and T. Anthony Ryan, pp 1879 DOI:10.1039/DT9900001879

Copper anti-inflammatory drugs in rheumatoid arthritis. Part 3. A potentiometric and spectroscopic study of zinc(II), calcium(II), and magnesium(II) polyaminodicarboxylate complexes Graham E. Jackson and Mark J. Kelly, pp 1889 DOI:10.1039/DT9900001889

Photochemical reactions of tricarbonyl[hydrotris(1-pyrazolyl)borato]rhenium(I) in the presence of neutral donor ligands. X-Ray crystal structures of the substitution derivatives [Re{HB(pz)3}(CO)2L], with L = C4H8O or PPh3 Mariangela Angaroni, G. Attilio Ardizzoia, Guiseppe D'Alfonso, Girolamo La Monica, Norberto Masciocchi and Massimo Moret, pp 1895 DOI:10.1039/DT9900001895

Synthesis, solid-state (X-ray) and solution (nuclear magnetic resonance) studies of the hydridocarbido carbonyl cluster anion [Re7H2C(CO)21]- Tiziaria Beringhelli, Guiseppe D'Alfonso, Gianfranco Ciani, Angelo Sironi and Henriette Molinari, pp 1901 DOI:10.1039/DT9900001901

Investigation of the electronic structure of tetrakis(trifluorophosphine)nickel by photoelectron spectroscopy with variable photon energy John G. Brennan, Jennifer C. Green, Catherine M. Redfern and Michael A. MacDonald, pp 1907 DOI:10.1039/DT9900001907

Kinetics and mechanism of the reaction between thallium(III) and thiocyanate ion in aqueous perchloric acid solutions Yugul K. Gupta, Dinesh Kumar, Seema Jain and Krishna S. Gupta, pp 1915 DOI:10.1039/DT9900001915

A theoretical model of the intensity of the near-infrared porphyrin-to-iron charge-transfer transitions in low-spin iron(III) haemoproteins. A correlation between the intensity of the magnetic circular dichroism bands and the rhombic distortion parameter of iron Andrew J. Thomson and Paul M. A. Gadsby, pp 1921 DOI:10.1039/DT9900001921

The oxidation of iodide by the tetrahydroxoargentate(III) ion in aqueous alkaline media Issifou Kouadio, Louis J. Kirschenbaum and Raj N. Mehrotra, pp 1929 DOI:10.1039/DT9900001929

Technetium(V) nitrido complexes with tetra-azamacrocycles: monocationic and neutral octahedral complexes containing the [TcN]2+ core. Crystal structure of [TcN(L1)H2O]·2H2O (H2L1= 1,4,8,11-tetra-azacyclotetradecane-5,7-dione) Andrea Marchi, Roberto Rossi, Luciano Magon, Adriano Duatti, Umberto Casellato, Rodolfo Graziani, Michel Vidal and Francoise Riche, pp 1935 DOI:10.1039/DT9900001935

Synthesis of dinuclear gold-(I), -(II), and -(III) complexes containing ylide ligands [(RO2C)CHPPh2CH(CO2R)]-(R = Me or Et) and trinuclear gold(I) complexes containing ylide ligands [(RO2C)CPPh2CH(CO2R)]2-(R = Me or Et) José Vicente, Maria-Teresa Chicote and Isabel Saura-Llamas, pp 1941 DOI:10.1039/DT9900001941

Synthesis of the first acetonylgold(III) complexes by C-H activation of acetone with 2-phenylazophenylgold(III) complexes José Vicente, Maria-Dolores Bermúdez, Maria-Teresa Chicote and Maria-José Sánchez-Santano, pp 1945 DOI:10.1039/DT9900001945

Molybdenum(VI) complex formation. Part 4. Equilibria and thermodynamic quantities for the reactions with tartrate in 1.0 mol dm-3 sodium chloride Johannes J. Cruywagen, J. Bernard B. Heyns and Elisabeth A. Rohwer, pp 1951 DOI:10.1039/DT9900001951

Reactions of co-ordinated ligands. Part 48. Reactivity studies of the octatrienediylidenedimolybdenum complexes [Mo2(µ-C8Me8)(-C5H5)2] and [Mo2(µ-C8H4But4)(-C5H5)2]. Crystal structures of [Mo2(µ-C8Me7CH2)(-C5H5)2][CF3SO3], [Mo2(µ-C8Me8)(µ-Cl)(-C5H5)2][SbCl4]·CH2Cl2, and [Mo2(µ-C8H4But4)(µMo,C-H)(-C5H5)2][BPh4]·CH2Cl2 Simon G. Bott, Lee Brammer, Neil G. Connelly, Michael Green, A. Guy Orpen, Jill F. Paxton, Colin J. Schaverien, Stuart Bristow and Nicholas C. Norman, pp 1957 DOI:10.1039/DT9900001957

Two phthalocyanine units stapled by carbon-carbon bonds in a new sandwich-type molecule: {5,5;19,19-bi[phthalocyaninato (2-)]}titanium(IV). Synthesis, X-ray crystal structure, and properties Claudio Ercolani, Anna Maria Paoletti, Giovanna Pennesi, Gentilina Rossi, Angiola Chiesi-Villa and Corrado Rizzoli, pp 1971 DOI:10.1039/DT9900001971

Syntheses and physicochemical properties of Cu(BF4)2 complexes of polythia[n]ferrocenophanes and the corresponding ferrocenium cations Masaru Sato, Motomi Katada, Satoru Nakashima, Hirotoshi Sano and Sadatoshi Akabori, pp 1979 DOI:10.1039/DT9900001979

Notes. X-Ray crystal structure of a copper(II) complex of the neurotoxic amino acid, DL--amino--methylaminopropionic acid Michael B. Hursthouse, Majid Motevalli, Paul O'Brien and Peter B. Nunn, pp 1985 DOI:10.1039/DT9900001985

Synthesis and structural characterization of an air-stable 17-electron complex containing the {Cr(NO)}2+ core Kom-Bei Shiu, J. L. Chou, Yu Wang and Gene-Hsiang Lee, pp 1989 DOI:10.1039/DT9900001989

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX023

Issue 7

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX025

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP031

Determination by ion exchange of the complexation of europium by a stibine, an arsine, and perchlorate in anhydrous aprotic organic solvents Gerard F. Payne, O. Lewin Keller jun. , Joseph Halperin and Wayne C. Wolsey, pp 1993 DOI:10.1039/DT9900001993

Stabilization of the open-chain structure of D-galacturonic acid in a dimeric complex with oxovanadium(IV) Mario Branca, Giovanni Micera, Daniele Sanna, Alessandro Dessě and Henryk Kozowski, pp 1997 DOI:10.1039/DT9900001997

A dynamic nuclear magnetic resonance study of the effects of methyl group substitution of the hexahapto-arene on the intramolecular rotations of (6-arene)dicarbonyl(triphenylphosphine)-chromium(0) and -molybdenum(0) complexes John A. Chudek, Geoffrey Hunter, Regine Louise MacKay, Peter Kremminger, Karl Schlögl and Walter Weissensteiner, pp 2001 DOI:10.1039/DT9900002001

Reactivity of Group 6 cationic complexes. Part 5. Photochemical water reduction by a chromium(II) metallorganic system and X-ray crystal and molecular structure of cis- and trans-[Cr(CO)2(-C5Me5){P(OMe)3}2]+ Liana Salsini, Marco Pasquali, Maurizio Zandomeneghi, Crescenzo Festa, Piero Leoni, Dario Braga and Piera Sabatino, pp 2007 DOI:10.1039/DT9900002007

Synthesis, reactivity, and electrochemistry of some new nitrides of molybdenum and tungsten: crystal structure of trinuclear [{µ-MoN(N3)2}{NMo(N3)(Et2PCH2CH2PEt2)2}2] David L. Hughes, Modher Y. Mohammed and Christopher J. Pickett, pp 2013 DOI:10.1039/DT9900002013

Determination of structural features of electrogenerated trans-[MoCl(NMe)(Ph2PCH2CH2PPh2)2]2+ by multinuclear electron paramagnetic resonance and electron nuclear double resonance spectroscopy and comparison of interatomic distances with those measured by X-ray analysis of the parent monocation David L. Hughes, David J. Lowe, Modher Y. Mohammed, Christopher J. Pickett and Nelson M. Pinhal, pp 2021 DOI:10.1039/DT9900002021

Peripheral functionalisation of the nickel(II) complex of a tetradentate (N3O) ligand via a pendant amine substituent James H. Cameron, Heather B. Harvey, John J. Liggat and Ian Soutar, pp 2029 DOI:10.1039/DT9900002029

Thermodynamics of formation of binary and ternary complexes of zinc(II) with halide and thiocyanate ions and 2,2-bipyridine in dimethylformamide Shin-ichi Ishiguro, Makoto Miyauchi and Kazuhiko Ozutumi, pp 2035 DOI:10.1039/DT9900002035

Syntheses, and structural, magnetic, and redox properties of multinuclear copper catecholates Eric Gojon, Jean-Marie Latour, Stephen J. Greaves, David C. Povey, Vijayalakshmi Ramdas and Gallienus W. Smith, pp 2043 DOI:10.1039/DT9900002043

Chemical and electrochemical substitution of monocarbon carboranes; rationalisation of experimental behaviour of derivatives of [nido-7-CB10H13]– and [closo-1-CB11H12]– Shah Alam Khan, John H. Morris and Shehla Siddiqui, pp 2053 DOI:10.1039/DT9900002053

Reactions of the co-ordinatively unsaturated µ3-alkylidyne cluster [WFe2(µ3-CC6H4Me-4)(µ-H)(µ-PPh2)(CO)6(-C5H5)] with PMe2Ph John C. Jeffery and Julian G. Lawrence-Smith, pp 2063 DOI:10.1039/DT9900002063

Synthesis, structure, and dynamic behaviour of (p-quinone)copper(I) complexes. Crystal structure determination of a copper p-benzoquinone complex stabilized by a tridentate oxygen ligand Bernd Lenders, Wolfgang Kläui, Manfred Irmler and Gerd Meyer, pp 2069 DOI:10.1039/DT9900002069

Co-ordination of a macrocyclic quadridentate tertiary amine ligand in the cis configuration: X-ray crystal structure of cis-[RuLCl2]ClO4(L = 1,4,7,10-tetramethyl-1,4,7,10-tetra-azacyclotridecane) Chi-Ming Che, Wai-Tong Tang, Wing-Tak Wong, Hon-Wah Lam and Ting-Fong Lai, pp 2077 DOI:10.1039/DT9900002077

Bifunctional phosphoric acid–phosphine oxide extractants: synthesis and complexes with uranium-(IV) and -(VI) and iron(III) Rina Arad-Yellin, Mendel Zangen, Hugo Gottlieb and Abraham Warshawsky, pp 2081 DOI:10.1039/DT9900002081

Copper(II)-promoted oxidation of mercaptocarboxylic acids. The characterization of disulphide- and oxalate-containing products. Crystal structures of [{Cu(bipy)(2,2-dtdp)}n]·3nH2O and [{Cu(bipy)(3,3-dtdp)}n]·2nH2O (bipy = 2,2-bipyridine, dtdp = dithiodipropanoate) Mark L. Brader, Eric W. Ainscough, Edward N. Baker, Andrew M. Brodie and David A. Lewandoski, pp 2089 DOI:10.1039/DT9900002089

Non-covalent interactions in thermodynamic stereoselectivity of mixed-ligand copper(II)-D- or L-histidine complexes with L-amino acids. A possible model of metal ion-assisted molecular recognition Gianna Borghesani, Ferdinando Pulidori, Maurizio Remelli, Roberto Purrello and Enrico Rizzarelli, pp 2095 DOI:10.1039/DT9900002095

Electrochemical synthesis of zinc(II), cadmium(II), and nickel(II) complexes of tetradentate Schiff-base ligands derived from aminothioether imidazoles Rufina Bastida, Teresa Lage, Conception Parrado, Teresa Rodriguez, Antonio Sousa and David E. Fenton, pp 2101 DOI:10.1039/DT9900002101

Synthesis and crystal structure of hexanuclear copper(I) complexes of µ3-pyridine-2-thionate Susumu Kitagawa, Megumu Munakata, Hisao Shimono, Shinji Matsuyama and Hideki Masuda, pp 2105 DOI:10.1039/DT9900002105

Nuclear magnetic resonance spectroscopic characterisation and the crystal and molecular structures of Ph3PSe·AlCl3and Ph3PSe·AlCl3: a classification of the co-ordinative bonding modes of the phosphine chalcogenides Neil Burford, Bruce W. Royan, Rupert E. v. H. Spence and Robin D. Rogers, pp 2111 DOI:10.1039/DT9900002111

Complexes of the platinum metals. Part 39. Salicylaldehydato(2–) derivatives of ruthenium, osmium, and iridium. X-Ray crystal structures of [Ru(OC6H4CO)(HOC6H4CH2OH)(CO)(PPh3)2]·CH2Cl2 and [Ru(OC6H4CO)(MeOH)(CO)(PPh3)2]·MeOH Arvind Sahajpal, Stephen D. Robinson, Muhammed A. Mazid, Majid Motevalli and Michael B. Hursthouse, pp 2119 DOI:10.1039/DT9900002119

Determination of the molecular structures of bis(methylsilyl) sulphide and bis(dimethylsilyl) sulphide in the gas phase by electron diffraction, supported by molecular mechanics calculations David G. Anderson, Veronica A. Campbell, George A. Forsyth and David W. H. Rankin, pp 2125 DOI:10.1039/DT9900002125

Solid-state carbon-13 nuclear magnetic resonance spectra of selected metal carboxylate complexes Paul A. Hunt, Brian P. Straughan, Ahmed A. M. Ali, Robin K. Harris and Barry J. Say, pp 2131 DOI:10.1039/DT9900002131

Multinuclear magnetic resonance study of the co-ordination of aluminium(III) with glycolic acid in aqueous solution, compared to co-ordination with oxalic and malonic acid Fokko R. Venema, Joop A. Peters and Herman van Bekkum, pp 2137 DOI:10.1039/DT9900002137

Bis(5-cyclopentadienyl) complexes of niobium(IV) and tantalum(IV); electron spin resonance and electrochemical studies and the molecular structure of [Ta(SCOPh)2(5-C5H5)2] John A. Hunter, W. Edward Lindsell, Kevin J. McCullough, Roger A. Parr and M. Louise Scholes, pp 2145 DOI:10.1039/DT9900002145

Ligand effects of ruthenium 2,2-bipyridine and 1,10-phenanthroline complexes on the electrochemical reduction of CO2 Hitoshi Ishida, Katsuyuki Fujiki, Tomoyuki Ohba, Katsutoshi Ohkubo, Koji Tanaka, Tohru Terada and Toshio Tanaka, pp 2155 DOI:10.1039/DT9900002155

Electronic structure factors of Ge–H bond activation by transition metals. Photoelectron spectra of [Mn(5-C5H5)(CO)2(HGePh3)], [Mn(5-C5H4Me)(CO)2(HGePh3)], and [Mn(5-C5Me5)(CO)2(HGePh3)] Dennis L. Lichtenberger and Anjana Rai-Chaudhuri, pp 2161 DOI:10.1039/DT9900002161

Chemical activation of pentaosmium carbonyl clusters: synthesis, structure, and reactivity of [Os5(CO)15(NCMe)] and [Os5H2(CO)14(NCMe)]; crystal structures of [Os5(CO)15{P(OMe)3}] and [Os5H2(CO)14(PEt3)] Rajesh Khattar, Brian F. G. Johnson, Jack Lewis, Paul R. Raithby and Maria J. Rosales, pp 2167 DOI:10.1039/DT9900002167

Base hydrolysis of -nitro-, azido- and isothiocyanato-[1,9-bis(2-pyridyl)-2,5,8-triazanonane]- and [1,11-bis(2-pyridyl)-2,6,10-triazaundecane]-cobalt(III) cations. Departure from first-order hydroxide dependence Etmina Ahmed, Martin L. Tobe and Madalena Humanes, pp 2175 DOI:10.1039/DT9900002175

Studies of the bonding in iron(II) cyclopentadienyl and arene sandwich compounds. Part 1. An interpretation of the iron-57 Mössbauer data Andrew Houlton, John R. Miller, Roger M. G. Roberts and Jack Silver, pp 2181 DOI:10.1039/DT9900002181

Gold–boron chemistry. Part 2. The interaction of {AuP(C6H11)3} bridges with decaboranyl cages: the accurate structure of [5,6-µ-{AuP(C6H11)3}-nido-B10H13], and the synthesis and molecular and electronic structures of its conjugate base [5,6,9,10-µ4-{AuP(C6H11)3}-nido-B10H12]– Andrew J. Wynd, Alan J. Welch and R. V. Parish, pp 2185 DOI:10.1039/DT9900002185

Camphor-derived -ketophosphonate complexes of molybdenum (VI) and titanium (IV); crystal and molecular structure of dichloro [(1R)-endo-(+)-3-(diethoxyphosphoryl)camphor]dioxomolybdenum(VI) Michael Gahagan, Raymond K. Mackie, David J. Cole-Hamilton, Domenico C. Cupertino, Mary Harman and Michael B. Hursthouse, pp 2195 DOI:10.1039/DT9900002195

The different reactivity of 2-aminopyridines and 2-pyridone with [Ru3(CO)12]. X-Ray crystal structure of [Ru3(µ-H)(µ3-anpy)(CO)9](hanpy = 2-anilinopyridine) Pedro L. Andreu, Javier A. Cabeza, Victor Riera, Yves Jeannin and Daniel Miguel, pp 2201 DOI:10.1039/DT9900002201

Formation in solution, synthesis, crystal structure, and magnetic properties of µ-hydroxo-µ-perchlorato-bis[(diethylenetriamine) perchloratocopper(II)] Isabel Castro, Juan Faus, Miguel Julve, Francesc Lloret, Michel Verdaguer, Olivier Kahn, Suzanne Jeannin, Yves Jeannin and Jacqueline Vaisserman, pp 2207 DOI:10.1039/DT9900002207

Synthesis, crystal structure, magnetic properties, and solution study of the complex µ-oxalato-bis[aqua(1,4,7-triazacyclononane)nickel(II)] nitrate dihydrate Andrea Bencini, Antonio Bianchi, Paola Paoli, Enrique García-Espańa, Miguel Julve and Victor Marcelino, pp 2213 DOI:10.1039/DT9900002213

Electrochemical studies of gold(I) and gold(III) complexes of bis(diphenylphosphines) James V. McArdle and Gerald E. Bossard, pp 2219 DOI:10.1039/DT9900002219

Synthesis and characterization of technetium(V) and rhenium(V) oxo-complexes with Schiff-base ligands containing the ONN donor-atom set. Molecular structure of trans-dichloro-oxo[1-(8-quinolyliminomethyl)-2-naphtholato-NNO]technetium(V) Francesco Tisato, Fiorenzo Refosco, Annarosa Moresco, Giuliano Bandoli, Ulderico Mazzi and Marino Nicolini, pp 2225 DOI:10.1039/DT9900002225

A study of electrochemically grown prussian blue films using Fourier-transform infra-red spectroscopy Paul A. Christensen, Andrew Hamnett and Simon J. Higgins, pp 2233 DOI:10.1039/DT9900002233

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 98. Tri- and tetra-nuclear metal compounds with ethylidyne or p-tolylmethylidyne groups, and having both cyclopentadienyl and carbaborane ligands M. Concepción Gimeno and F. Gordon A. Stone, pp 2239 DOI:10.1039/DT9900002239

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 99. Synthesis of the cluster compounds [MWCoAu(µ-CC6H4Me-4)(µ3-CR)(CO)4(-C5H5)(-C5Me5)(5-C2B9H9Me2)](M = Mo or W, R = C6H4Me-4; M = W, R = Me); crystal structure of the complex [MoWCoAu-(µ-CC6H4Me-4)(µ3-CC6H4Me-4)(CO)4(-C5H5)(-C5Me5)(5-C2B9H9Me2)]·CH2Cl2 Nicholas Carr, M. Concepción Gimeno and F. Gordon A. Stone, pp 2247 DOI:10.1039/DT9900002247

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 100. Synthesis of mixed-metal compounds via the salts [NEt4][Rh(CO)L(5-C2B9H9R2)](L = PPh3, R = H; L = CO, R = Me); crystal structures of the complexes [WRhAu(µ-CC6H4Me-4)(CO)3(PPh3)(-C5H5)(5-C2B9H11)] and [WRh2Au2(µ3-CC6H4Me-4)(CO)6(-C5H5)(5-C2B9H9Me2)2]·0.5CH2Cl2 Nicholas Carr, M. Conceptión Gimeno, Justin E. Goldberg, Massimino U. Pilotti, F. Gordon A. Stone and Isil Topalolu, pp 2253 DOI:10.1039/DT9900002253

Synthesis of 4-1,3-diphosphacyclobutadiene(5-1,2-dicarbaborane)rhodium complexes; crystal structures of the compounds [NEt4][Rh(4-But2C2P2)(5-C2B9H11)], [Rh{4-But2C2P2Au(PPh3)}(5-C2B9H11)], and [Rh{4-But2C2P2Co-(CO)2(4-C4Me4)}(5-C2B9H11)] Helen F. Dare, Judith A. K. Howard, Massimino U. Pilotti, F. Gordon A. Stone and Jürgen Szameitat, pp 2263 DOI:10.1039/DT9900002263

Kinetics of silver(I)-catalysed oxidation of hydrazinium ion by the [ethylenebis(biguanide)]silver(III) cation Rupendranath Banerjee, Amitava Das and Subrata Dasgupta, pp 2271 DOI:10.1039/DT9900002271

Synthesis, X-ray crystal structure, and reactivity of the binuclear copper(I) complex [{Cu(3,5Me2-pz)(CNR)}2](R = cyclohexyl, 3,5Me2-pz = 3,5-dimethylpyrazolate) toward RNCO (R = cyclohexyl), PhNCS, COS, and CS2. N,S Co-ordination of the 3,5-dimethylpyrazolecarbodithioate anion in [Cu{3,5Me2-pz–C(S)–S}(CNR)2] G. Attilio Ardizzoia, M. Angela Angaroni, Girolamo La Monica, Norberto Masciocchi and Massimo Moret, pp 2277 DOI:10.1039/DT9900002277

Synthesis, structure, and magnetism of the trinuclear copper(II) complex [Cu(CuL)2][ClO4]2[H2L = 3,3-(trimethylenedinitrilo)bis(2-butanone oxime)] Dominique Luneau, Hiroki Oshio, Hisashi kawa and Sigeo Kida, pp 2283 DOI:10.1039/DT9900002283

Optical and magnetic properties of K[M{S2C2(CN)2}2]·H2O (M = Ni, Pt, or Au) Shoichi Kutsumizu, Norimichi Kojima, Naohilo Watanabe and Toshiro Ban, pp 2287 DOI:10.1039/DT9900002287

Platinum complexes of the tripod-like ligand tris(2-diphenylphosphinoethyl)amine (tdpea). X-Ray crystal strcture of [Pt(tdpea)(CH2Cl)]BPh4 Carlo A. Ghilardi, Stefano Midollini, Simonetta Moneti, Annabella Orlandini, Giancarlo Scapacci and Aldo Traversi, pp 2293 DOI:10.1039/DT9900002293

Notes. Synthesis and X-ray crystal structure of a naphthalene complex of ruthenium, [Ru(6-C10H8)(4-cod)](cod = cyclo-octa-1,5-diene) Mark Crocker, Michael Green, Judith A. K. Howard, Nicholas C. Norman and Diane M. Thomas, pp 2299 DOI:10.1039/DT9900002299

Preparation and crystal structure of a novel spirocyclic derivative of hexachlorocyclotriphosphazene Barteld de Ruiter, Johan C. van de Grampel and Fré van Bolhuis, pp 2303 DOI:10.1039/DT9900002303

Iodine-127 nuclear magnetic resonance spectra of transition-metal periodate complexes John Evans, William Levason and Mark D. Spicer, pp 2307 DOI:10.1039/DT9900002307

Protonation of electron-rich diphosphazane-bridged derivatives of dicobalt octacarbonyl: crystal structure of [Co2(µ-H)(CO)4{µ-(MeO)2PN(Et)P(OMe)2}2]BPh4·CH2Cl2 John S. Field, Raymond J. Haines and Lesley A. Rix, pp 2311 DOI:10.1039/DT9900002311

Synthesis and characterization of four-membered, spirobicyclic, transition-metal-substituted phosphoranes Badri N. Anand, Rajwant Bains and Km. Usha, pp 2315 DOI:10.1039/DT9900002315

Letters riks Kupe and Edmunds Lukevics, pp 2319 DOI:10.1039/DT9900002319

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX027

Issue 8

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX029

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP037

New fluxional seven-co-ordinate molybdenum(II) and tungsten(II) complexes: X-ray structure of the pyridine-2-thionato complex [W(C5H4NS)2(CO)2(PMe2Ph)] Antony J. Deeming, Manzurul Karim and Nicholas I. Powell, pp 2321 DOI:10.1039/DT9900002321

Magnetostructural correlations for hexachlorodicuprate(II) salts: crystal structure and magnetic properties of the tetrameric complex [{Cu2(terpy)Cl4}2](terpy = 2,2:6,2-terpyridine) José-Vicente Folgado, Pedro Gómez-Romero, Fernando Sapiña and Daniel Beltrán-Porter, pp 2325 DOI:10.1039/DT9900002325

Tungsten(VI) complexes as new products in the high-intensity photolysis of octacyanotungstate(V) ion in hydroxylic solvents; crystal structure of [PPh4]2[W(CN)6O]·H2O and [PPh4]2[W(CN)5O(OMe)] Barbara Sieklucka, Nathaniel W. Alcock, Terence J. Kemp and Derk J. Stufkens, pp 2331 DOI:10.1039/DT9900002331

Complex formation of calcium(II) with amino acids under physiological conditions Masunobu Maeda, Kohji Okada, Yoshihiro Tsukamoto, Kazushiro Wakabayashi and Kaname Ito, pp 2337 DOI:10.1039/DT9900002337

Electron paramagnetic resonance and visible spectroscopic studies of mixed-ligand complexes of copper(II) ion, salicylate ion, and a nitrogen base in aqueous solution Enric Casassas, Anna Izquierdo-Ridorsa and Romà Tauler, pp 2341 DOI:10.1039/DT9900002341

Synthesis of conformational isomers, thermally induced isomerism, and crystal structure of cis-di-isothiocyanatobis(N-methylpropane-1,3-diamine)nickel(II) Alok K. Mukherjee, Monika Mukherjee, Siddhartha Ray, Ashutosh Ghosh and Nirmalendu Ray Chaudhuri, pp 2347 DOI:10.1039/DT9900002347

Characterisation of monomeric methylsodium and methylpotassium: infrared spectra of the matrix-isolated molecules Klaus Burczyk and Anthony J. Downs, pp 2351 DOI:10.1039/DT9900002351

Chemistry of phosphido-bridged dimolybdenum complexes. Part 5. Synthesis and protonation of a phosphido-bridged dimolybdenum complex containing a terminal alkyne ligand: X-ray crystal structures of [Mo2(µ-PPh2)2(CO)(-C2Me2)(-C5H5)2] and [Mo2(µ-Co)(µ-PPh2){µ-Ph2PC(Me)CHMe}(-C5H5)2][BF4] Gráinne Conole, Mary McPartlin, Martin J. Mays and Michael J. Morris, pp 2359 DOI:10.1039/DT9900002359

Chemistry of phosphide-bridged dimolybdenum complexes. Part 6. The insertion of allene into co-ordinated µ-vinyl and 3-allyl ligands; X-ray crystal structures of [Mo2(-C5H5)2(µ-PMe2){3-CH2C(CH2)C(Me)CH2}(CO)3] and [Mo2(-C5H5)2{µ-5-CH2C(CH2)C(Me)CH2}(µ-PMe2)(CO)2] Gráinne Conole, Kim Henrick, Mary McPartlin, Andrew D. Horton, Martin J. Mays and Enrico Sappa, pp 2367 DOI:10.1039/DT9900002367

Synthetic studies on cobalt carbonyl complexes containing antimony and bismuth. Crystal structures of [SbO(OH){Co(CO)3L}2][L = PPh3 or P(C6H4Me-p)3] William Clegg, Neville A. Compton, R. John Errington, David C. R. Hockless, Nicholas C. Norman, Martin Ramshaw and Peter M. Webster, pp 2375 DOI:10.1039/DT9900002375

Unexpected nitrogen-oxygen exchange reactions in cyclic metallaphosphazenes; synthesis and X-ray crystal structures of [Mo(OPPh2NHPPh2O)O2Cl2], [Mo(OPPh2NPPh2O)2(O)Cl], and [Mo(OPPh2NPPh2O)2O2] Mathias Rietzel, Herbert W. Roesky, Kattesh V. Katti, Hans-Georg Schmidt, Regine Herbst-Irmer, Mathias Noltemeyer, George M. Sheldrick, Martyn C. R. Symons and Atieh Abu-Raqabah, pp 2387 DOI:10.1039/DT9900002387

Raman and X-ray crystallographic studies of solid trimethylindium Alexander J. Blake and Stephen Cradock, pp 2393 DOI:10.1039/DT9900002393

Six- and seven-co-ordinate manganese(II) complexes of Schiff-base ligands derived from the condensation of 2,6-diacetylpyridine with ethanolamine (L1) or propanolamine (L2); X-ray crystal structures of [MnL1Cl2]·H2O and [{MnL2(NCS)2}x] Sally Brooker and Vickie McKee, pp 2397 DOI:10.1039/DT9900002397

Synthesis, infrared, and X-ray study of di-µ-thiocyanato-1N,S:2N,S-bis-[bis(2,2-bipyridine)di-isothiocyanatobismuth(III)]: a case of eight-co-ordinated bismuth Nuccio Bertazzi, Giuseppe Alonzo, Luigi P. Battaglia, Anna Bonamartini Corradi and Giorgio Pelosi, pp 2403 DOI:10.1039/DT9900002403

Selective C-O bond cleavage of allylic esters using [MoH4(Ph2PCH2CH2PPh2)2] under light irradiation to give hydridocarboxylatomolybdenum(II) complexes Takashi Ito, Tetsuaki Matsubara and Yoichiro Yamashita, pp 2407 DOI:10.1039/DT9900002407

Preparation and characterisation of tetraphenylphosphonium and tetraphenylarsonium halogenoargentates(I), including a new lodoargentate(I) cluster, [Ag4I8]4-, containing three- and four-co-ordinated silver(I) Göran Helgesson and Susan Jagner, pp 2413 DOI:10.1039/DT9900002413

Iron-57 Mössbauer spectroscopic studies on 1,1-bis(diphenylphosphino)ferrocene metal complexes. The influence of metal-ion geometry on the hyperfine interactions Andrew Houlton, Sahd K. Ibrahim, Jonathan R. Dilworth and Jack Silver, pp 2421 DOI:10.1039/DT9900002421

Acid-base chemistry of polypyridyl ruthenium compounds of (pyridin-2-yl)-1,2,4-triazoles. X-Ray crystal structure of bis(2,2-bipyridine)[3-methyl-5-(pyridin-2-yl)-1,2,4-triazolato-N1]ruthenium hexafluorophosphate tetrahydrate Barbara E. Buchanan, Johannes G. Vos, Masao Kaneko, Wilhelm J. M. van der Putten, John M. Kelly, Ronald Hage, Rudolf A. G. de Graaff, Rob Prins, Jaap G. Haasnoot and Jan Reedijk, pp 2425 DOI:10.1039/DT9900002425

Metal complexes of benzodiazepines. Part 1. Synthesis, crystal structure, and characterization in solid and solution of trans-dichloro(7,8-dichloro-2,3-dihydro-2,2,4-trimethyl-1H-1,5-benzodiazepine)(tri-n-propylphosphine)-palladium(II) Maria Chiara Aversa, Placido Giannetto, Giuseppe Bruno, Matteo Cusumano, Antonino Giannetto and Silvano Geremia, pp 2433 DOI:10.1039/DT9900002433

Dynamic processes of trinuclear carbonyl clusters [M3(CO)12](M = Fe, Ru, or Os) and their derivatives Brian F. G. Johnson and Adrian Bott, pp 2437 DOI:10.1039/DT9900002437

Synthesis of dicarbonyl and halogeno complexes of (-pentamethyl-cyclopentadienyl)(nitrosyl)-molybdenum and -tungsten. Crystal structure of [{Mo(5-C5Me5)(NO)Br(µ-Br)}2] Pilar Gomez-Sal, Ernesto de Jesús, Wilfried Michiels, Pascual Royo, Amelio Vázquez de Miguel and Sagrario Martínez-Carrera, pp 2445 DOI:10.1039/DT9900002445

Reduction-oxidation properties of organotransition-metal complexes. Part 31. Reductive elimination, oxidative addition and substitution, and migratory insertion in pentaphenylcyclopentadienylruthenium nitrosyl chemistry Neil G. Connelly, Andrew C. Loyns, Ian Manners, David L. Mercer, Karen E. Richardson and Philip H. Rieger, pp 2451 DOI:10.1039/DT9900002451

Macrocyclic tetranuclear clusters with 28-, 32-, 36-, 40-, and 44-membered rings as high-potential iron-sulphur protein analogues Takenori Tomohiro, Kouichi Uoto and Hiroaki (Yohmei) Okuno, pp 2459 DOI:10.1039/DT9900002459

Reactions of dimesityldioxo-osmium(VI) with donor ligands; reactions of MO2(2,4,6-Me3C6H2)2, M = Os or Re, with nitrogen oxides. X-Ray crystal structures of [2,4,6-Me3C6H2N2]+[OsO2(ONO2)2(2,4,6-Me3C6H2)]-, OsO(NBut)(2,4,6-Me3C6H2)2, OsO3(NBut), and ReO3[N(2,4,6-Me3C6H2)2] Brian S. McGilligan, John Arnold, Geoffrey Wilkinson, Bilquis Hussain-Bates and Michael B. Hursthouse, pp 2465 DOI:10.1039/DT9900002465

Polynuclear thiolate complexes in solution. Solution equilibria studies of silver(I) complexes of 4-mercapto-1-methylpiperidine Pilar González-Duarte and Josep Vives, pp 2477 DOI:10.1039/DT9900002477

Polynuclear thiolate complexes in solution. Solution equilibria studies of silver(I) complexes of 3-(dimethylamino)propane-1-thiol and 3-aminopropane-1-thiol and comparative study with 4-mercapto-1-methylpiperidine Pilar González-Duarte and Josep Vives, pp 2483 DOI:10.1039/DT9900002483

Synthesis and characterization of dinickel(II) and dipalladium(II) complexes of the macrocyclic binucleating ligand 3,13-dimethyl-3,13-dinitro-1,5,11,15-tetra-azacycloeicosane-8,18-dithiol (L5). Crystal structure of the complex [Ni2(L5- 2H)][NO2]2·3.5H2O Geoffrey A. Lawrance, Marcel Maeder, Therese M. Manning, Margaret A. O'Leary, Brian W. Skelton and Allan H. White, pp 2491 DOI:10.1039/DT9900002491

New nickel(II) and palladium(II) complexes with unsymmetrical quadridentate Schiff bases derived from 8-amino-4-methyl-5-azaoct-3-en-2-one. Crystal and molecular structure of [4,10-dimethyl-3-(nitroso-N)-5,9-(diaza-2N)-trideca-3,10-diene-2,12-(dionato-O)(2-)]nickel(II) Marek Kwiatkowski, Edmund Kwiatkowski, Aleksandra Olechnowicz, Douglas M. Ho and Edward Deutsch, pp 2497 DOI:10.1039/DT9900002497

Protonation of bis[1,2-bis(diethylphosphino)ethane]bis(dinitrogen)-molybdenum and -tungsten with fluoroboric acid-diethyl ether (1/1) in benzene; crystal and molecular structure of bis[1,2- bis(diethylphosphino)ethane]fluoro[hydrazido(2-)]tungsten tetrafluoroborate J. Elaine Barclay, Adrian Hills, David L. Hughes, G. Jeffery Leigh, Colin J. Macdonald, Mohamad Abu Bakar and Hapipah Mohd.-Ali, pp 2503 DOI:10.1039/DT9900002503

Mixed sulphur and phosphorus ylide complexes of palladium formed by phase-transfer catalysis. X-Ray crystal structure of [Pd{(CH2)2S(O)Me}{Ph2PCH2PPh2CHC(O)Ph}]I·CH2Cl2·H2O Ivan J. B. Lin, H. C. Shy, C. W. Liu, Ling-Kang Liu and Shou-Kei Yeh, pp 2509 DOI:10.1039/DT9900002509

Octahedral and trigonal-bipyramidal complexes of osmium(II) with 1,2-bis(dicyclohexylphosphino)ethane. Stereochemistry of addition reactions to five-co-ordinate osmium(II) derivatives and to their ruthenium(II) analogues Antonio Mezzetti, Alessandro Del Zotto and Pierluigi Rigo, pp 2515 DOI:10.1039/DT9900002515

Single-atom NCS bridging in binuclear complexes of MnII, FeII, CoII, NiII, and CuII of macrocyclic 20- and 22-membered ligands: a spectroscopic, crystallographic, and molecular mechanics study Charlie Harding, Debbie McDowell, Jane Nelson, Suman Raghunathan, Clarke Stevenson, Michael G. B. Drew and Paul C. Yates, pp 2521 DOI:10.1039/DT9900002521

Reactions of the complexes [WI2(CO)(NCMe)(2-RC2R)2](R = Me or Ph) with dithiocarbamates and related ligands, and the X-ray crystal structure of [WI(CO)(S2CNC4H8)(,2-MEC2Me)2] Elaine M. Armstrong, Paul K. Baker, Kevin R. Flower and Michael G. B. Drew, pp 2535 DOI:10.1039/DT9900002535

Redox-active cavitand host molecules containing multiple ferrocenyl redox centres: syntheses, crystal structure, molecular mechanics calculations, and electrochemical properties Paul D. Beer, E. Louise Tite, Michael G. B. Drew and Arthur Ibbotson, pp 2543 DOI:10.1039/DT9900002543

Bis(arene)vanadium anions, a new class of organovanadium complexes: syntheses, reactivity towards carbon oxides, and electron spin resonance investigation Giovanni Fochi, Xu Runjuan and Arturo Colligiani, pp 2551 DOI:10.1039/DT9900002551

Synthesis, reactivities, and electrochemical properties of pyridinecarboxamide complexes of rhodium(III) and iridium(III). Crystal structure of [Rh(bpb)(py)2]ClO4[H2bpb = 1,2-bis(2-pyridinecarboxamido)benzene, py = pyridine] Shing-Tat Mak, Vivian Wing-Wah Yam, Chi-Ming Che and Thomas C. W. Mak, pp 2555 DOI:10.1039/DT9900002555

Synthesis of heteroleptic violurato complexes of coIII. Influence of the co-ordinated ligands on the protonation-deprotonation reactions of dihydrogenviolurate anion. Crystal structure of potassium dihydrogenviolurato(nitrilotriacetato)cobaltate(III) dihydrate, K[Co(H2vi)(nta)]·2H2O Fidel Almazán, Enrique García-España, Miquel Mollar, Francesc Lloret, Miguel Julve, Juan Faus, Xavier Solans and Neus Alins, pp 2565 DOI:10.1039/DT9900002565

Reactions of co-ordinated ligands. Part 49. Ligand-displacement and oxidative-addition reactions of [Ru{P(OMe)3}(4-C4Ph4)(4-C5H6)]; crystal structures of [Ru(NCMe){P(OMe)3}(3-C3H5)(4-C4Ph4)][SbF6] and [Ru{C(Ph)C(Ph)C(6-C6H5)C(Ph)CH2CHCH2}{P(OMe)3}2][BF4] Mark Crocker, Michael Green, Katherine R. Nagle and David J. Williams, pp 2571 DOI:10.1039/DT9900002571

Kinetic studies in aqueous solutions of cobalt(II)-ethylenediamine, -malonate, and -glycinate complexes Károly Micskei and István Nagypál, pp 2581 DOI:10.1039/DT9900002581

Oxidative addition of I2, MeI, and CH2I2 to the naphthalene-1,8-diamide bridged complex [Ir2{µ-1,8-(NH)2C10H6}(CO)2(PPh3)2]. X-Ray crystal structure of [Ir2I2(µ-CH2){µ-1,8-(NH)2C10H6}(CO)2(PPh3)2]·CH2Cl2 María J. Fernández, Javier Modrego, Fernando J. Lahoz, José A. López and Luis A. Oro, pp 2587 DOI:10.1039/DT9900002587

Some novel phosphoranides containing pentafluorophenyl groups Rusmidah Ali and Keith B. Dillon, pp 2593 DOI:10.1039/DT9900002593

Kinetics and mechanism of anation reactions of [M(NH3)5(H2O)]3+ by H3POn/H2POn- Systems (M = CrIII, n= 3; M = CoIII, n= 2) Miguel Ferrer, Gabriel Gonzalez and Manuel Martinez, pp 2597 DOI:10.1039/DT9900002597

Co-ordination properties of dialkyltin(IV) in aqueous solution. Thermodynamics of complex formation with carboxylic acids Guiseppe Arena, Antonio Gianguzza, Lorenzo Pellerito, Salvatore Musumeci, Roberto Purrello and Enrico Rizzarelli, pp 2603 DOI:10.1039/DT9900002603

Co-ordination chemistry of higher oxidation states. Part 35. Synthetic, spectroscopic, and electrochemical studies of some mer- and fac-[OsL3X3]/[OsL3X3]+ systems (L = PR3, AsR3, SbR3, or pyridine; X = Cl or Br): crystal structure of fac-[Os(PEt2Ph)3Cl3]·CH2Cl2 Robert A. Cipriano, William Levason, Roy A. S. Mould, Derek Pletcher and Michael Webster, pp 2609 DOI:10.1039/DT9900002609

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 101. Synthesis of the compounds [WPt(µ-CC6H4Me-4)(µ-:x-C2BnHn-1Me2)(CO)2(PMe2Ph)2](x= 5, n= 9; x= 6, n= 10); crystal structures of an isomer of each complex Nicholas Carr, M. Concepción Gimeno and F. Gordon A. Stone, pp 2617 DOI:10.1039/DT9900002617

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 102. Alkylidyne ligand migration from manganese to a rhodacarbaborane cluster; crystal structure of [Rh{,5-CH(C6H4Me-4)-C2B9H10}(CO)(PPh3)] Massimino U. Pilotti and F. Gordon A. Stone, pp 2625 DOI:10.1039/DT9900002625

Notes. Proton nuclear magnetic resonance and optical spectra of six-co-ordinated high-spin (S= 2) bis(tetrahydrofuran)(3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropionato)iron(II) encapsulated in aqueous detergent micelles Shyamalava Mazumdar and Okhil K. Medhi, pp 2633 DOI:10.1039/DT9900002633

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX031

Issue 9

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX033

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP041

Positively charged Pd2 complexes of a new thiophenoxide-hinged binucleating ligand. The crystal and molecular structure of µ-{4-methyl-2,6-bis[2-(2-pyridyl-N)ethylimino-N-methyl]thiophenolato-1S:2S}-bis[dichloropalladium(II)] chloride-water-methanol (1/1/0.5) Bernard F. Hoskins, Christine J. McKenzie, Richard Robson and Lu Zhenrong, pp 2637 DOI:10.1039/DT9900002637

Sterically hindered organotin compounds. Part 1. Synthesis and reaction chemistry of tris(trimethylsilyl)methyltin(IV) derivatives. X-Ray crystal structures of Sn(CH2Ph)2[C(SiMe3)3](OSiMe3) and Sn(CH2Ph)2[C(SiMe3)3][CH2CHC(SiMe3)2] Paul Brown, Mary F. Mahon and Kieran C. Molloy, pp 2643 DOI:10.1039/DT9900002643

Comparison of the hydrolyses of gallium(III) and aluminium(III) solutions by nuclear magnetic resonance spectroscopy Susan M. Bradley, Ronald A. Kydd and Raghav Yamdagni, pp 2653 DOI:10.1039/DT9900002653

Reaction of [FeL4X2][FeX4](L = OPPh3 or OAsPh3, X = Cl or Br) with sulphur dioxide to yield some rare examples of iron(III) complexes of sulphur dioxide, [FeL4{OS(O)X}2][FeX4]. The oxidation of sulphur dioxide by the iron(III) complexes and the isolation of the sulphuric acid derivatives (PPh3O)(PPh3OH)(HSO4) and (AsPh3OH)(HSO4). Crystal structure of the latter Brian Beagley, David G. Kelly, Philomena P. Mac Rory, Charles A. McAuliffe and Robin G. Pritchard, pp 2657 DOI:10.1039/DT9900002657

Halogenation reactions of electron-rich diphosphazane ligand-bridged derivatives of dicobalt octacarbonyl: crystal structures of [Co2(µ-I)(µ-CO)(CO)2{µ-(MeO)2PN(Et)P(OMe)2}2]BPh4 and [Co(CO)2{P(OMe)3}2{(MeO)2PN(Et)P(OMe)2-P}]BPh4 Neil J. Bailey, John S. Field, Raymond J. Haines and Lesley A. Rix, pp 2661 DOI:10.1039/DT9900002661

Carbon-hydrogen and metal-carbon bond formation and breakage in thermal reactions of bis(mesityl)(cyclo-octatetraene)zirconium(IV) derivatives. Crystal structures of [Zr(8-C8H8)(mes)2], [{Zr(8-C8H8)[-OC(mes)2]}2], [{Zr(8-C8H8)(µ-2,4-Me2-6-CH2C6H2)}2], and [{Zr(8-C8H8)}2(µ-mes)(µ-2,4-Me2-6-CHC6H2)](mes = 2,4,6-Me3C6H2) Pietro Berno, Sergio Stella, Carlo Floriani, Angiola Chiesi-Villa and Carlo Guastini, pp 2669 DOI:10.1039/DT9900002669

Aqueous chemistry of platinum and palladium complexes. Part 2. Synthesis and crystal structure of a palladium hydroxo complex [Pd(terpy)(OH)]ClO4·H2O (terpy = 2,2:6,2-terpyridine) Paule Castan, Françoise Dahan, Smita Wimmer and Franz L. Wimmer, pp 2679 DOI:10.1039/DT9900002679

Reactions of nucleophiles with bis(µ-thiosulphato-S)-bis(dinitrosylferrate)(2-), [Fe2(S2O3)2(NO)4]2-, and of electrophiles with heptanitrosyltri-µ3-thio-tetraferrate(1-), [Fe4S3(NO)7]-: new routes to bis(µ-organothiolato)-bis(dinitrosyliron) complexes [Fe2(SR)2(NO)4] and the crystal and molecular structure of trimethylsulphonium heptanitrosyltri-µ3-thio-tetraferrate(1-), SMe3[Fe4S3(NO)7] Christopher Glidewell, Ronald J. Lambert, Mary E. Harman and Michael B. Hursthouse, pp 2685 DOI:10.1039/DT9900002685

Synthesis and complexation properties of a novel potassium-selective trisanisyl bis(benzo-crown ether) Paul D. Beer, E. Louise Tite and Arthur Ibbotson, pp 2691 DOI:10.1039/DT9900002691

Kinetics and mechanism of the oxidation of phosphinic, phenylphosphinic, and phosphorous acids by pyridinium fluorotrioxochromate(VI) Anu Moondra, Abha Mathur and Kalyan K. Banerji, pp 2697 DOI:10.1039/DT9900002697

The trans effect in gold(III) complexes. Kinetics of substitution reactions of the trichloro(phenyl)aurate(III) anion in methanol Etmina Ahmed, Robin J. H. Clark, Martin L. Tobe and Lucio Cattalini, pp 2701 DOI:10.1039/DT9900002701

The structure of D-xylo-5-hexulosonic acid and its gadolinium(III) complexes in aqueous medium as studied by nuclear magnetic resonance M. Madalena Caldeira, Herman van Bekkum and Joop A. Peters, pp 2707 DOI:10.1039/DT9900002707

Synthesis, characterization, and oxygenation of bis-fenced porphyrinato iron(II) and cobalt(II) complexes Eishun Tsuchida, Teruyuki Komatsu, Etsuo Hasegawa and Hiroyuki Nishide, pp 2713 DOI:10.1039/DT9900002713

Manganese complexes with S2CPEt3 ligands. X-Ray crystal structures of cis-trans-[Mn(CO)2(PEt3)2(S2CPEt3)]ClO4 and cis-trans-[Mn(CO)2(PEt3)2(S2CH)] Daniel Miguel, Victor Riera, Jesús A. Miguel, Fernando Diego, Claudette Bois and Yves Jeannin, pp 2719 DOI:10.1039/DT9900002719

Redox-active liquid membranes: transport of electrons across a dichloromethane layer mediated by the [CoIIIL1X2]+-[CoIIL1X2] redox system (L1= 1-hexadecyl-1,4,8,11-tetra-azacyclotetradecane, X = Cl or ClO4) Giancarlo De Santis, Luigi Fabbrizzi, Antonio Poggi and Barbara Seghi, pp 2729 DOI:10.1039/DT9900002729

Lattice effects in the Mössbauer spectra of salts of [Fe4S4(SBut)4]2-. Crystal structures of [NMe4]2[Fe4S4(SBut)4]·HSBut and [N(n-C5H11)4]2[Fe4S4(SBut)4]·HSBut David J. Evans, Adrian Hills, David L. Hughes, Geoffrey J. Leigh, Andrew Houlton and Jack Silver, pp 2735 DOI:10.1039/DT9900002735

Heavier halides of early transition elements by halide-exchange reactions. Crystal and molecular structure of [Ph3C]2[Hf2Cl10] Fausto Calderazzo, Piersandro Pallavicini, Guido Pampaloni and Pier Francesco Zanazzi, pp 2743 DOI:10.1039/DT9900002743

Palladium(II) complexes of N,N-co-ordinating arylazouracil ligands: infrared spectroscopy, thermal properties, and X-ray crystal structure of trans-bis(6-amino-1,3-dimethyl-5-phenylazouracilato)palladium(II) José Ruiz, Enrique Colacio, Juan de Dios López-Gonzalez, Markku Sundberg and Raikko Kivekäs, pp 2747 DOI:10.1039/DT9900002747

Dilithium tetra(t-butylimido)-molybdate(VI) and -tungstate(VI) and some reactions thereof. X-Ray crystal structures of W[(µ-NBut)2AlX2]2(X = Cl or Me), [W(NBut)2(NH2But)Cl(µ-Cl)]2, and [W2Cu5(NBut)2(µ-NBut)6(NHBut)2]BF4 Andreas A. Danopoulos, Geoffrey Wilkinson, Bilquis Hussain-Bates and Michael B. Hursthouse, pp 2753 DOI:10.1039/DT9900002753

Copper(II) and nickel(II) complexes of N,N,N,N?-tetrakis(2-aminoethyl)-1,4,7,11-tetra-azacyclotetradecane (taei), -1,4,8,12-tetra-azacyclopentadecane (taep), and -1,5,9,13-tetra-azacyclohexadecane (taeh). Crystal structures of [Cu2(taep)][ClO4]4, [Cu2(taeh)][ClO4]4, and [Cu2(N3)(taeh)][ClO4]3 Ichiro Murase, Ikuhiko Ueda, Nobuhiro Marubayashi, Sigeo Kida, Naohide Matsumoto, Machiko Kudo, Makoto Toyohara, Kumiko Hiate and Masahiro Mikuriya, pp 2763 DOI:10.1039/DT9900002763

Synthesis, spectroscopic and structural characterization of mono- and bi-nuclear iron(II) complexes with 2,6-diacetylpyridine bis(acylhydrazones) Alex Bonardi, Clara Carini, Curzio Merlo, Corrado Pelizzi, Giancarlo Pelizzi, Pieralberto Tarasconi, Francesca Vitali and Fabrizio Cavatorta, pp 2771 DOI:10.1039/DT9900002771

Synthesis of (pentamethylcyclopentadienyl)nitrosylmolybdenum complexes containing halide, methyl, or cyclopentadienyl ligands. Crystal structures of [MoMe(-C5H5)(-C5Me5)(NO)] and [{Mo(-C5Me5)O(µ-O)}2] Ernesto de Jesús, Amelio Vázquez de Miguel, Pascual Royo, Anna Maria Manotti Lanfredi and Antonio Tiripicchio, pp 2779 DOI:10.1039/DT9900002779

Synthetic, spectroscopic, and X-ray crystallographic studies on phenylcyanamidocopper(II) complexes. The characterization of three different co-ordination modes for phenylcyanamide anions Mark L. Brader, Eric W. Ainscough, Edward N. Baker, Andrew M. Brodie and Scott L. Ingham, pp 2785 DOI:10.1039/DT9900002785

Novel S-N ring contractions using the 4-phenyl-1,2,3,5-dithiadiazole dimer, the synthesis and X-ray crystal structures of [(PhCN2S2)2Cl][S3N3], [PhCN2S2][S3N3], and [PhCN2S2][S3N2]Cl, and an ab initio molecular-orbital study of the bonding in [PhCN2S2][S3N3] Arthur J. Banister, Michael I. Hansford, Zdenek V. Hauptman, Anthony W. Luke, Simon T. Wait, William Clegg and Karl Anker Jørgensen, pp 2793 DOI:10.1039/DT9900002793

Gold-boron chemistry. Part 3. The synthesis, characterisation, and molecular structure of [(H11C6)3PAu]2B8H10. Comments on the anomalous structure of B8H12 Andrew J. Wynd and Alan J. Welch, pp 2803 DOI:10.1039/DT9900002803

Electrochemical and electron spin resonance studies of dichloro(1,2,4-triazole)copper(II) and dichlorobis(1,2,4-triazole)copper(II) in dimethyl sulphoxide Karl M. Kadish, Yuanjian Deng, Souad Zaydoun and Malika Saidi Idrissi, pp 2809 DOI:10.1039/DT9900002809

Photochemistry of tricarbonyl (5-cyclopentadienyl)(trifluoroacetyl)-molybdenum in a variety of frozen gas matrices at ca. 12 K: infrared spectroscopic evidence for carbon monoxide ejection and difluorocarbene formation by -F elimination Andrew K. Campen, Khalil A. Mahmoud, Antony J. Rest and Paul A. Willis, pp 2817 DOI:10.1039/DT9900002817

Photochemistry of some dinuclear molybdenum and tungsten cyclopentadienyl carbonyl complexes in frozen gas matrices at ca. 12 K: infrared spectroscopic evidence for carbon monoxide ejection as a primary photoprocess Martin L. Baker, Peter E. Bloyce, Andrew K. Campen, Antony J. Rest and Thomas E. Bitterwolf, pp 2825 DOI:10.1039/DT9900002825

Photochemistry of some iron and ruthenium (5-cyclopentadienyl) carbonyl dimers in frozen gas matrices at ca. 12 K Peter E. Bloyce, Andrew K. Campen, Richard H. Hooker, Antony J. Rest, Neil R. Thomas, Thomas E. Bitterwolf and Joyce E. Shade, pp 2833 DOI:10.1039/DT9900002833

Blue copper models. Synthesis and characterization of copper(II) enethiolate complexes derived from (1R)-3-hydroxymethylenebornane-2-thione and 2-aminothia-alkyl-1-methylbenzimidazoles (donor set N2SS*) or diamines (donor set N2S2) Luigi Casella, Michele Gullotti, Edoardo Suardi, Massimo Sisti, Roberto Pagliarin and Piero Zanello, pp 2843 DOI:10.1039/DT9900002843

Co-ordination of 6,13-dimethyl-1,4,8,11-tetra-azacyclotetradecane-6,13-diamine to platinum(II) and palladium(II). Syntheses, characterisation, and X-ray crystal structures of the perchlorate salts of both complexes Paul V. Bernhardt, Geoffrey A. Lawrance, Wyona C. Patalinghug, Brian W. Skelton, Allan H. White, Neil F. Curtis and Asokamali Siriwardena, pp 2853 DOI:10.1039/DT9900002853

Synthesis, physical properties and X-ray crystal structure of an oxovanadium(IV) complex of the pendant-arm macrocycle 6,13-dimethyl 1,4,8,11-tetra-azacyclotetradecane-6,13-diamine Paul V. Bernhardt, Geoffrey A. Lawrance, Peter Comba, Lisandra L. Martin and Trevor W. Hambley, pp 2859 DOI:10.1039/DT9900002859

Reactivity of [Os3H(CO)10(MeCN){Si(OR)3}](R = Me or Et) towards diphosphines. X-Ray crystal structures of [Os3H(CO)10{Si(OEt)3}(dppe)], [{Os3H(CO)10[Si(OMe)3]}2(µ-dppe)] and [Os3(CO)10(dppe)](dppe = Ph2PCH2CH2PPh2) Brian F. G. Johnson, Jack Lewis, Magda Monari, Dario Braga, Fabrizia Grepioni and Cecilia Gradella, pp 2863 DOI:10.1039/DT9900002863

The molecular structures of the gaseous dimeric molecules Me2Ga(µ-H)2GaMe2 and Me2Ga(µ-Cl)2GaMe2 as determined by electron diffraction Paul L. Baxter, Anthony J. Downs, Michael J. Goode, David W. H. Rankin and Heather E. Robertson, pp 2873 DOI:10.1039/DT9900002873

Synthesis, characterisation, and some properties of molecular mixed-ligand peroxo complexes of uranium(VI) containing amines or aminocarboxylic acids as coligands Manish Bhattacharjee, Mihir K. Chaudhuri and Ranendra N. Dutta Purkayastha, pp 2883 DOI:10.1039/DT9900002883

Polyhedral iridamonocarbaborane chemistry. Two ten-vertex arachno-6,9-iridacarbadecaboranes and some related ten-vertex carbaborane chemistry. Comparative nuclear magnetic resonance studies and the molecular structure of [asym-9-(CO)-9,9-(PPh3)2-9-H-arachno-9,6-IrCB8H12] Xavier L. R. Fontaine, John D. Kennedy, Mark Thornton-Pett, Karl Nestor, Bohumil tíbr, Tomá Jelínik and Karel Bae, pp 2887 DOI:10.1039/DT9900002887

Five-co-ordinated copper(II) complexes: a new look at the isomerization from trigonal-bipyramidal to square-pyramidal geometry in bis(bipyridyl)-(monodentate ligand)copper(II) and related complexes Oliviero Carugo and Carla Bisi Castellani, pp 2895 DOI:10.1039/DT9900002895

Potentiometric and spectroscopic studies on oxovanadium(IV) complexes of salicylic acid and catechol and some derivatives Malgorzata Jezowska-Bojczuk, Henryk Kozowski, András Zubor, Tamás Kiss, Mario Branca, Giovanni Micera and Alessandro Dessì, pp 2903 DOI:10.1039/DT9900002903

Spectroscopic and potentiometric study of protonation and copper(II) complex formation of 3-amino-L-tyrosine Pál Sipos and Tamás Kiss, pp 2909 DOI:10.1039/DT9900002909

Gold(I) complexes of 1-diphenylarsino-2-diphenylphosphinoethane (dadpe): solution studies, X-ray crystal structures, and cytotoxicity of [(AuCl)2dadpe]·0.5dma (dma = dimethylacetamide) and [Au(dadpe)2]Cl·2H2O Orla M. Ni Dhubhghaill, Peter J. Sadler and Reiko Kuroda, pp 2913 DOI:10.1039/DT9900002913

Notes. Synthesis and structure of a new inorganic dianionic bis(dithiocarbonato)nitridotechnetate(V) complex K2[TcN(S2CO)2]·2H2O Roberto Rossi, Andrea Marchi, Luciano Magon, Umberto Casellato and Rodolfo Graziani, pp 2923 DOI:10.1039/DT9900002923

Synthesis and reactivity of mono-, tri-, and poly-nuclear ruthenium carbonyl complexes containing the pyridine-2-thiolate ligand (pyS). Stepwise preparation of [Ru(pyS)2(CO)2] by reaction of [Ru3(CO)12] with pyridine-2-thiol Pedro L. Andreu, Javier A. Cabeza, José M. Fernández-colinas and Víctor Riera, pp 2927 DOI:10.1039/DT9900002927

The oxidative dimerization of arylamido complexes of platinum revisited: protonation/deprotonation or oxidation/reduction? Pablo Espinet, Gabriel Garcia-Herbosa and José M. Ramos, pp 2931 DOI:10.1039/DT9900002931

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX035

Issue 10

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX037

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP047

A tetrahedral zinc(II) complex of N-(R)-1-phenylethylsalicylideneimine. Structural and circular dichroism spectral investigations on stereoselectivity Hiroshi Sakiyama, Hisashi kawa, Naohide Matsumoto and Sigeo Kida, pp 2935 DOI:10.1039/DT9900002935

Cobalt(II)-lanthanoid(III)(Ln = La, Nd, or Gd) complexes of N,N-ethylenebis(3-carboxysalicylideneimine). Interaction of ligating groups on the Co-Ln centre Yichiro Aratake, Hisashi kawa, Eiji Asato, Hiroshi Sakiyama, Masahito Kodera, Sigeo Kida and Masatomi Sakamoto, pp 2941 DOI:10.1039/DT9900002941

Charge density and spectra of dichlorotetrakis(thiourea) nickel(II): an ab initio discrete variation X calculation George A. Christos, Brian N. Figgis and Philip A. Reynolds, pp 2947 DOI:10.1039/DT9900002947

Synthesis and characterization of transition-metal-substituted germanium and tin azides: X-ray crystal structures of [{Fe(CO)2(cp)}2E(N3)2](cp =-C5H5, E = Ge or Sn) Mark J. Hampden-Smith, Deqing Lei and Eileen N. Duesler, pp 2953 DOI:10.1039/DT9900002953

Synthesis and spectroscopic properties of [AsPh4][MO(bipy)(CN)3]·0.5bipy·2H2O (M = Mo or W); X-ray crystal structure of the tungsten complex Janusz Szklarzewicz, Alina Samotus, Nathaniel W. Alcock and Matthias Moll, pp 2959 DOI:10.1039/DT9900002959

Studies of pendant arm macrocyclic ligands. Part 7. Synthesis of two sexidentate macrocycles based upon a pyridine-containing tetra-aza macrocycle with either two 2-pyridylmethyl or two 1-pyrazolylmethyl pendant co-ordinating arms, and characterisation of their cobalt(II), nickel(II), copper(II), and zinc(II) complexes. Crystal structure of {3,11-di(2-pyridylmethyl)-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17),13,15-triene}nickel(II) perchlorate Karappulli P. Balakrishnan, Hadi A. A. Omar, Peter Moore, Nathaniel W. Alcock and Graham A. Pike, pp 2965 DOI:10.1039/DT9900002965

The mode of co-ordination of the quaternised 2,4-bipyridinium cation. Crystal structures of trichloro(1-methyl-2,4-bipyridinium-N1)platinum(II) dihydrate and dichloro(1-methyl-2,4-bipyridin-3-ylium-C3, N1)platinum(II) Paule Castan, Françoise Dahan, Smita Wimmer and Franz L. Wimmer, pp 2971 DOI:10.1039/DT9900002971

Reactivity of the hydride [CoH{P(OEt)2Ph}4] with RN2+(R = aryl), NO+, and H+ cations: preparation and properties of new cobalt complexes. Measurements of T1 for [CoH{P(OEt)2Ph}4] and [CoH2{P(OEt)2Ph}4]BPh4 Gabriele Albertin, Paola Amendola, Stefano Antoniutti and Emilio Bordignon, pp 2979 DOI:10.1039/DT9900002979

Syntheses, crystal structures, and electrochemical properties of binuclear copper(II,II)[Cu2L1Cl2][ClO4]2·4CH3CN and copper(I,I)[Cu2L1][ClO4]2 complexes {L1= 2,5-bis[N,N-bis(2-pyridylethyl)aminomethyl]pyrazine} Hiroki Oshio, pp 2985 DOI:10.1039/DT9900002985

Novel dinuclear ruthenium(I) and osmium(I) complexes containing poly(pyrazolyl)borato ligands. X-Ray crystal structure of [{Ru[HB(C3H3N2)3](CO)2}2] Margot M. de V. Steyn, Eric Singleton, Sibbele Hietkamp and David C. Liles, pp 2991 DOI:10.1039/DT9900002991

Electronic structure of axially distorted molybdenum(V) complexes; an absorption spectral study David Collison, pp 2999 DOI:10.1039/DT9900002999

Kinetic and mechanistic studies on the complexation of aquachromium(III) with DL-tryptophan in aqueous acidic media J. Chem. Soc., Dalton Trans. DOI:10.1039/DT9900003007

Spectroscopic and electrical properties of [Cu(C3Se5)2]2- and [Ni(C3Se5)2]2- anion complexes and X-ray crystal structures of [NMe4]2[Cu(C3Se5)2]·2MeCN and[NBun4][Ni(C3Se5)2] Gen-etsu Matsubayashi and Akito Yokozawa, pp 3013 DOI:10.1039/DT9900003013

Formation of platinum-enamine complexes by reaction of Zeise's salt with secondary amines Giuseppe Balacco and Giovanni Natile, pp 3021 DOI:10.1039/DT9900003021

Reaction of polynuclear acetylide clusters. Synthesis of pentanuclear heterometallic clusters by addition of [M(CO)3(CCPh)(-C5H5)] to [MOs3(CO)11(CCPh)(-C5H5)](M = Mo or W). Crystal structures of [Mo2Os3(CO)11(CCPhCCPh)(-C5H5)2]·2H2O and [MoWOs3(CO)8(µ4-C)-(µ3-CPh)(CCPh)(-C5H5)2]·CH2Cl2 Chang-Ho Wu, Yun Chi, Shie-Ming Peng and Gene-Hsiang Lee, pp 3025 DOI:10.1039/DT9900003025

Synthesis of the tetranuclear mixed-metal carbido clusters [WRu3L(CO)11(µ4-C)(µ-H)]via methoxymethylidyne clusters [WRu3L(CO)11(µ3-COMe)](L =-C5H5 or -C5Me5). Crystal structures of [WRu3(-C5Me5)(CO)11(µ3-COMe)] and [WRu3(-C5H5)(CO)11(µ4-C)(µ-H)] Yun Chi, Shiow-Huey Chuang, Bao-Fei Chen, Shie-Ming Peng and Gene-Hsiang Lee, pp 3033 DOI:10.1039/DT9900003033

Organoruthenaborane chemistry. Part 7. Preparation, molecular structure, and nuclear magnetic resonance properties of eleven-vertex closo-type clusters: [2,4-Me2-1 -(pcym)-1,2,4-RuC2B8H8], [2,3-Me2-1 -(pcym)-1,2,3-RuC2B8H8], [1-(pcym)-1-RuB10H10] and some related species Mark Bown, Xavier L. R. Fontaine, Norman N. Greenwood, John D. Kennedy and Mark Thornton-Pett, pp 3039 DOI:10.1039/DT9900003039

Camphor-derived -ketophosphine complexes of palladium(II) and platinum(II) D. Andrew Knight, David J. Cole-Hamilton and Domenico C. Cupertino, pp 3051 DOI:10.1039/DT9900003051

Synthesis and crystal structures of the complexes [RhPt(µ-H)(µ-CO)(PEt3)2(PPh3)(5-C2B9H11)] and [RhPt{-C(C6H4Me-4)C(C6H4Me-4)H}(CO)(PEt3)(PPh3)(5-C2B9H11)] Justin E. Goldberg, Judith A. K. Howard, Harald Müller, Massimino U. Pilotti and F. Gordon A. Stone, pp 3055 DOI:10.1039/DT9900003055

Mono- and di-nuclear nickel(II) complexes with Schiff bases derived from 4-substituted 2,6-diformylphenol and 7-amino-4-methyl-5-azahept-3-en-2-one; crystal and molecular structure of [4-chloro-2,6-bis(4-methyl-2-oxo-5,8-diazanona-3,8-dienyl)phenolato(3-)]dinickel(II) bromide hemihydrate Marek Kwiatkowski, Edmund Kwiatkowski, Aleksandra Olechnowicz, Douglas M. Ho and Edward Deutsch, pp 3063 DOI:10.1039/DT9900003063

Direct synthesis of intercalation compounds between a layered double hydroxide and an anionic dye In Yong Park, Kazuyuki Kuroda and Chuzo Kato, pp 3071 DOI:10.1039/DT9900003071

Ab initio study of the photoelectron spectra and bonding in [Ru2(O2CH)4] and [Ru2(O2CH)4(NO)2]: the effect of axial ligands on metal-metal interactions Geoffrey E. Quelch, Ian H. Hillier and Martyn F. Guest, pp 3075 DOI:10.1039/DT9900003075

Synthesis of intermediates in the C-H activation of acetone with 2-phenylazophenylgold(III) complexes and in the C-C coupling of aryl groups from diarylgold(III) complexes. Crystal and molecular structures of [Au{C6H3(NNC6H4Me-4)-2-Me-5}(acac-C)Cl](acac = acetylacetonate), cis-[Au(C6H4NNPh-2)Cl2(PPh3)], and [Au(C6H4CH2NMe2-2)(C6F5)Cl] José Vicente, María Dolores Bermúdez, Jaime Escribano, María Pilar Carrillo and Peter G. Jones, pp 3083 DOI:10.1039/DT9900003083

Reaction products between gold(III) bromide and tetramethylthiourea: dibromobis(tetramethylthiourea)gold(III) dibromoaurate(I) and bromo(tetramethylthiourea)gold(I). Synthesis, crystal and molecular structure, and infrared spectra Antonio C. Fabretti, Aleardo Giusti and Wanda Malavasi, pp 3091 DOI:10.1039/DT9900003091

Syntheses, spectroscopy, and electrochemistry of high-valent osmium(V) and -(VI) oxo complexes of macrocyclic tertiary amine ligands Chi-Ming Che, Wing-Kin Cheng and Vivian Wing-Wah Yam, pp 3095 DOI:10.1039/DT9900003095

Mechanism of the reaction of cuboidal [Mo3FeS4(H2O)10]4+ with dioxygen Paul W. Dimmock and A. Geoffrey Sykes, pp 3101 DOI:10.1039/DT9900003101

Fluxional behaviour of bis- and tris-(ether phosphine)ruthenium(II) chloro and acetato complexes G. Malachy McCann, Andrew Carvill, Ekkehard Lindner, Berthold Karle and Hermann A. Mayer, pp 3107 DOI:10.1039/DT9900003107

X-Ray structures and magnetism of azido-bridged mixed-ligand binuclear copper(II) complexes. Model complexes of the type III copper protein centre Keiji Matsumoto, Shun'ichiro Ooi, Wasuke Mori and Yasuo Nakao, pp 3117 DOI:10.1039/DT9900003117

Unusual behaviour of the thioether function of the ligand 1,8-bis(3,5-dimethyl-1-pyrazolyl)-3,6-dithiaoctane (bddo) towards transition-metal salts. X-Ray structures of a green and a red modification of [Cu(bddo)Cl2] Willem G. Haanstra, Wilfred A. J. W. van der Donk, Willem L. Driessen, Jan Reedijk, John S. Wood and Michael G. B. Drew, pp 3123 DOI:10.1039/DT9900003123

Substitution of [Ru3(µ-H)3(µ3-Bi)(CO)9] with monodentate Group 15 donor ligands Brian F. G. Johnson, Jack Lewis and Alan J. Whitton, pp 3129 DOI:10.1039/DT9900003129

On the factors controlling the crystal packing of first-row transition-metal binary carbonyls Dario Braga, Fabrizia Grepioni and Piera Sabatino, pp 3137 DOI:10.1039/DT9900003137

Notes. Dynamic processes in the solid state. X-Ray structural characterization and dynamic behaviour of [Mo(C6H5Me)(CO)3] Dario Braga and Fabrizia Grepioni, pp 3143 DOI:10.1039/DT9900003143

Formation of [FeM(-C5H5)(CO)4(µ-CO)(µ-CRCRH)](M = Fe or Ru) complexes from the reaction of [MH(-C5H5)(CO)2] with [Fe2(CO)9] and acetylenes. X-Ray structure of [FeRu(-C5H5)(CO)4(µ-CO)(µ-CPhCPhH)] Ramon Yáñez, Josep Ros, Isabel Moldes, René Mathieu, Xavier Solans and Mercé Font-Bardía, pp 3147 DOI:10.1039/DT9900003147

Neutral pentanuclear Pt3Ag2 complexes: crystal structure of trans-[PtCl2{(µ-SC4H8)Pt(C6F5)3(2-C6H5Me)}2] Rafael Usón, Juan Forniés, Milagros Tomás and Irene Ara, pp 3151 DOI:10.1039/DT9900003151

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX039

Issue 11

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX041

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP051

Proton and zinc(II) complexes of 2-(polyhydroxyalkyl)thiazolidine-4-carboxylic acid derivatives Tamás Gajda, László Nagy and Kálmán Burger, pp 3155 DOI:10.1039/DT9900003155

Manganese(II) complexes containing the tridentate ligands 2,6-bis[1-(phenylimino)ethyl]pyridine, L1, or 2,6-bis[1-(4-methoxyphenylimino)ethyl]pyridine, L2. The molecular structures of five-co-ordinate [MnBr2L1] and the zinc analogue [ZnCl2L1] Dennis A. Edwards, Mary F. Mahon, William R. Martin, Kieran C. Molloy, Phillip E. Fanwick and Richard A. Walton, pp 3161 DOI:10.1039/DT9900003161

Synthesis of the cationic bis(but-2-yne) complex [W(CO)(NCMe)(S2CNC4H8)-(2-MeC2Me)2]BF4 and its reactions with neutral bidentate donor ligands (L–L) to give [W(CO)(S2CNC4H8)(L–L)(2-MeC2Me)]BF4: X-ray crystal structure determination of [W(CO)(S2CNC4H8)(Ph2PCH2PPh2)(2-MeC2Me)]BF4 Paul K. Baker, Kevin R. Flower, Mary E. Harman and Michael B. Hursthouse, pp 3169 DOI:10.1039/DT9900003169

Copper co-ordination compounds of a chelating imidazole–thioether ligand. The molecular structures of [1,3-bis(5-methyl-4-imidazolyl)-2-thiapropane]-bis(nitrato)copper(II) and bis[1,3-bis(5-methyl-4-imidazolyl)-2-thiapropane]-copper(II) bis(tetrafluoroborate)–ethanol(1/2) Ambria C. van Steenbergen, Elisabeth Bouwman, Rudolf A. G. de Graaff, Willem L. Driessen, Jan Reedijk and Piero Zanello, pp 3175 DOI:10.1039/DT9900003175

Nickel(II) complexes of Schiff-base ligands derived from the condensation of 2,6-diacetylpyridine with ethanolamine (L1) or propanolamine (L2); X-ray crystal structures of [NiL12][ClO4]2·H2O, [{NiL1(NCS)2}2], [NiL22][ClO4]2, and [{NiL2(NCS)2}x]{L1= 2,6-bis[1-(2-hydroxyethylimino)ethyl]pyridine and L2= 2,6-bis[1-(3-hydroxypropylimino)ethyl]pyridine} Sally Brooker and Vickie McKee, pp 3183 DOI:10.1039/DT9900003183

Oxidative electrochemistry of the cluster [Co4(CO)9{HC(PPh2)3}]. Reactivity with the nucleophiles PPh3 and P(OMe)3 Jean Rimmelin, Rodolphe Jund, Maurice Gross and Ali A. Bahsoun, pp 3189 DOI:10.1039/DT9900003189

Reactions of cyclopalladated compounds. Part 24. Reactivity of the Pd–C bond of cyclopalladated compounds towards isocyanides and carbon monoxide. Role of the donor group Jairton Dupont and Michel Pfeffer, pp 3193 DOI:10.1039/DT9900003193

Synthesis and characterisation of half-sandwich tantalum compounds in oxidation states (I)–(V): tertiary phosphine, acetylene, butadiene, carbonyl, and oxo derivatives. X-Ray crystal structures of [Ta(C5Me5)Cl3(PMe3)] and [Ta(C5Me5)Cl2(CO)2(PMe3)] Vernon C. Gibson, Terence P. Kee and William Clegg, pp 3199 DOI:10.1039/DT9900003199

Patterns of nuclear spin coupling in species with platinum–tin bonds: a comparison of phosphorus and tin William McFarlane and Nicholas H. Rees, pp 3211 DOI:10.1039/DT9900003211

Spectroscopy and redox properties of the luminescent excited state of [Au2(dppm)2]2+(dppm = Ph2PCH2PPh2) Chi-Ming Che, Hoi-Lun Kwong, Chung-Kwong Poon and Vivian Wing-Wah Yam, pp 3215 DOI:10.1039/DT9900003215

Weak charge-transfer polyoxoanion salts: the reaction of quinolin-8-ol (Hquin) with phosphotungstic acid and the crystal and molecular structure of [H2quin]3[PW12O40]·4EtOH·2H2O Donato Attanasio, Mario Bonamico, Vincenzo Fares, Patrizia Imperatori and Lorenza Suber, pp 3221 DOI:10.1039/DT9900003221

Preparation, properties, and crystal and molecular structures of trans-tetrakis(acetic acid)dichlorovanadium(II) and hexakis(acetic acid)vanadium(II) dibromide David G. L. Holt, Leslie F. Larkworthy, David C. Povey, Gallienus W. Smith and G. Jeffery Leigh, pp 3229 DOI:10.1039/DT9900003229

Preparation and X-ray crystal structure of a vanadium(III) complex of salicylaldehyde hydrazone from vanadium–Schiff base precursors David L. Hughes, G. Jeffery Leigh and J. Roger Sanders, pp 3235 DOI:10.1039/DT9900003235

Novel stannosilicates. Part 1. Synthesis and characterisation Alan Dyer and Jalal J. Jafar, pp 3239 DOI:10.1039/DT9900003239

Comparative photochemistry of some tricarbonyl(4-polyene)iron complexes in frozen gas matrices at ca. 12 K Stephen T. Astley, Mary P. V. Churton, Ramli B. Hitam and Antony J. Rest, pp 3243 DOI:10.1039/DT9900003243

Synthesis of nickel(II), copper(II), zinc(II), and cadmium(II) complexes of 2-[(2-mercaptophenyl)iminomethyl] pyrrole and 2-[(2-mercaptoethyl)-iminomethyl]pyrrole by the electrochemical cleavage of a disulphide bond: the crystal structure of bis{2-[(pyrrol-2-yl)methyleneamino]thiophenolato-S,N}zinc(II) Jesus Castro, Jaime Romero, José A. García-Vázquez, María L. Durán, Alfonso Castińeiras, Antonio Sousa and David E. Fenton, pp 3255 DOI:10.1039/DT9900003255

Oxidative addition of diphenylphosphinoacetic acid to rhodium: crystal structures of the intermediate, [RhCl(H)(Ph2PCH2CO2-OP)(Ph2PCH2CO2H-P)2] and of the final product, [Rh(Ph2PCH2CO2-OP)3] Alexandr Jegorov, Jaroslav Podlaha, Jana Podlahová and Frantiek Tureek, pp 3259 DOI:10.1039/DT9900003259

Palladium superoxido complexes. In what way ( or ) is O2– co-ordinated? A quantum chemical approach Michael J. Filatov, Eugeni P. Talsi, Oleg V. Gritsenko, George M. Zhidomirov and Kirill I. Zamaraev, pp 3265 DOI:10.1039/DT9900003265

The displacement of the heterocyclic base R-py from [Pd(dien)(R-py)]2+(dien = 1,5-diamino-3-azapentane, R-py = 4-chloropyridine or 4-aminopyridine) by water in acid and basic solution and by chloride. The involvement of a stable five-co-ordinate species Luciano Canovese, Lucio Cattalini, Paolo Uguagliati and Martin L. Tobe, pp 3271 DOI:10.1039/DT9900003271

Kinetics of reactions of pentane-2,4-dionato complexes of manganese(III) with glyoxylate anion in aqueous perchlorate media Rupendranath Banerjee, Rina Das and Amiya K. Chakraburtty, pp 3277 DOI:10.1039/DT9900003277

Novel mono- and di-ferrocenyl bipyridyl ligands: syntheses, electrochemistry, and electropolymerisation studies of their ruthenium(II) complexes Paul D. Beer, Oldrich Kocian and Roger J. Mortimer, pp 3283 DOI:10.1039/DT9900003283

Metallocene bis(aza-crown ether) ligands and related compounds. Their syntheses, co-ordination chemistry, and electrochemical properties Paul D. Beer, Anthony D. Keefe, Harrison Sikanyika, Christopher Blackburn and Jerome F. McAleer, pp 3289 DOI:10.1039/DT9900003289

Redox-responsive crown ethers containing a direct link between the ferrocene redox-active centre and a benzo-crown ether. Crystal structures of a ferrocene benzo-15-crown-5 ligand and of its sodium complex Paul D. Beer, Harrison Sikanyika, Christopher Blackburn, Jerome F. McAleer and Michael G. B. Drew, pp 3295 DOI:10.1039/DT9900003295

Thermochemistry of ammonium and rubidium perrhenates, and the effect of hydrogen bonding on the solubilities of ammonium salts David A. Johnson, pp 3301 DOI:10.1039/DT9900003301

Oxidation reaction of [{Cu(Hpz)2Cl}2](Hpz = pyrazole): synthesis of the trinuclear copper(II) hydroxo complexes [Cu3(OH)(pz)3(Hpz)2Cl2]·solv (solv = H2O or tetrahydrofuran). Formation, magnetic properties, and X-ray crystal structure of [Cu3(OH)(pz)3(py)2Cl2]·py (py = pyridine) Mariangela Angaroni, G. Attilio Ardizzoia, Tiziana Beringhelli, Girolamo La Monica, Dante Gatteschi, Norberto Masciocchi and Massimo Moret, pp 3305 DOI:10.1039/DT9900003305

An electron spin resonance spectral study of bis(dimethylglyoximato)-cobalt(II) and some phosphine and phosphite adducts Baltazar de Castro, Maria Rangel and J. Barrie Raynor, pp 3311 DOI:10.1039/DT9900003311

Synthesis and characterization of two aluminoarsenates with occluded ethylenediamine Jiesheng Chen, Ruren Xu, Yihua Xu and Jianqing Qiu, pp 3319 DOI:10.1039/DT9900003319

Ternary complexes of substituted catechols and dipeptides with copper(II) Debjani Chakraborty and Pabitra K. Bhattacharya, pp 3325 DOI:10.1039/DT9900003325

Reactions of [Mo(NO){HB(3,5-Me2C3N2H)3}I2] with some cyclic ethers to form alkoxide complexes Najat J. Al Obaidi, Christopher J. Jones and Jon A. McCleverty, pp 3329 DOI:10.1039/DT9900003329

Substitution chemistry of carbonyl and sulphur dioxide triangulo-platinum clusters. Crystal structure of [Pt3(µ-CO)(µ-SO2)2{P(C6H11)3}3] Simon G. Bott, Andrew D. Burrows, Osayi J. Ezomo, Malcolm F. Hallam, John G. Jeffrey and D. Michael P. Mingos, pp 3335 DOI:10.1039/DT9900003335

Synthesis, spectroscopy, and electrochemistry of heterocyclic thionato complexes of divalent nickel: crystal structure of tetraethylammonium fac-[tris(benzothiazoline-2-thionato)nickelate(II)] Eric S. Raper, Amanda M. Britton and William Clegg, pp 3341 DOI:10.1039/DT9900003341

Protonation and deprotonation reactions of triruthenium nona- and octa-carbonyl clusters containing a µ3-2-amido-6-methylpyridine (µ3-ampy) ligand. X-Ray structures of [Ru3(µ-H)2(µ3-ampy)(CO)9][BF4] and of one of the two isolated isomers of [Ru3(µ-H)2(µ3-ampy)(CO)8(PPh3)][BF4] Pedro L. Andreu, Javier A. Cabeza, Victor Riera, Claudette Bois and Yves Jeannin, pp 3347 DOI:10.1039/DT9900003347

Octahedral alkylidyne complexes of tungsten with chelating ligands as precursors for polynuclear compounds. Crystal structures of [W(CR)(CO)2(dmpe)(NCS)] and [Co2W(µ3-CR)(CO)8(dmpe)Br](R = C6H4Me-4, dmpe = Me2PCH2CH2PMe2) Gabino A. Carriedo, Gema Sánchez, Victor Riera, Claudette Bois, Yves Jeannin and Daniel Miguel, pp 3355 DOI:10.1039/DT9900003355

Synthesis, structures, and electrochemistry of palladium and platinum macrocyclic complexes of [18]aneN2S4(1,4,10,13-tetrathia-7,16-diazacyclo-octadecane) and Me2[18]aneN2S4(7,16-dimethyl-1,4,10,13-tetrathia-7,16-diazacyclo-octadecane). Single crystal X-ray structures of [Pd(Me2[18]aneN2S4)][PF6]2·Me2CO, [Pd([18]aneN2S4)][BPh4]2, and [Pd2Cl2([18]aneN2S4)][PF6]2·2MeCN Alexander J. Blake, Gillian Reid and Martin Schröder, pp 3363 DOI:10.1039/DT9900003363

Synthesis of tetranuclear iron–sulphur protein analogues with tetrathiol ligands attached to macrocycles which provide intramolecular hydrophobic domains Hiroaki (Yohmei) Okuno, Kouichi Uoto, Takenori Tomohiro and Marie-Thérčse Youinou, pp 3375 DOI:10.1039/DT9900003375

Formation and stability constants of dimethyltin(IV) complexes with citrate, tripolyphosphate, and nitrilotriacetate in aqueous solution Giuseppe Arena, Annalinda Contino, Salvatore Musumeci and Roberto Purrello, pp 3383 DOI:10.1039/DT9900003383

Oxo transfer and metal oxidation in the reaction of [Ru(PPh3)3Cl2] with m-chloroperbenzoic acid: structure of [Ru(PPh3)2(m-ClC6H4CO2)Cl2] Surajit Chattopadhyay, Nilkamal Bag, Partha Basu, Goutam Kumar Lahiri and Animesh Chakravorty, pp 3389 DOI:10.1039/DT9900003389

Chiral discriminations of complexes with D3 symmetry. Molecular structure and crystal-packing mode of (–)589-tris[(–)-O,O-1(R),2(R)-dimethylethylene dithiophosphato]chromium(III), [Cr{(–)bdtp}3] Reiko Kuroda and Paolo Biscarini, pp 3393 DOI:10.1039/DT9900003393

Crystal structure of bis(2,2-bipyridyl)monochlorocopper(II) tetrafluoroborate. A relook at the structural pathway of the bis(2,2-bipyridyl)monochlorocopper(II) cation Patrick Nagle, Edward O'Sullivan, Brian J. Hathaway and Edgar Muller, pp 3399 DOI:10.1039/DT9900003399

Investigation of the electronic structures of -cyclopentadienyl transition-metal dihalide dimers Jennifer C. Green, Malcolm L. H. Green, Philip Mountford and Michael J. Parkington, pp 3407 DOI:10.1039/DT9900003407

Ferrocenyl surface species on platinum and conducting glass electrodes, and on photoelectrochemical n-silicon electrodes F. Rudolph Mayers, Anthony G. Osborne and David R. Rosseinsky, pp 3419 DOI:10.1039/DT9900003419

Aryl and aryne complexes of chromium, molybdenum, and tungsten. X-Ray crystal structures of [Cr(2-MeC6H4)(µ-2-MeC6H4)(PMe3)]2, Mo(2-2-MeC6H3)(2-MeC6H4)2(PMe2Ph)2, and W(2-2,5-Me2C6H2)(2,5-Me2C6H3)2-(PMe3)2 Stefan U. Koschmieder, Brian S. McGilligan, Gregory McDermott, John Arnold, Geoffrey Wilkinson, Bilquis Hussain-Bates and Michael B. Hursthouse, pp 3427 DOI:10.1039/DT9900003427

Macrocyclic ligand ring size effects. Part 1. Complexation of tetra-aza ligands containing fused dibenzo substituents with ZnII and CdII: a solution stability, X-ray crystal structure, and molecular mechanics study Kenneth R. Adam, Brian J. McCool, Anthony J. Leong, Leonard F. Lindoy, Christopher W. G. Ansell, Philip J. Baillie, Keith P. Dancey, Laurel A. Drummond, Kim Henrick, Mary McPartlin, Dalgit K. Uppal and Peter A. Tasker, pp 3435 DOI:10.1039/DT9900003435

Linear thermodynamic relationships for the ternary system copper(II)–5-substituted 1,10-phenanthroline--amino acid Yun-Ti Chen, Hua-Kuan Lin and Jun-Ying Zhu, pp 3445 DOI:10.1039/DT9900003445

Nuclear magnetic resonance studies of the protonation sequence of some oxaaza macrocyclic compounds Maria T. S. Amorim, José R. Ascenso, Rita Delgado and Joăo J. R. Fraústo da Silva, pp 3449 DOI:10.1039/DT9900003449

Gold complexes with heterocyclic thiones as ligands. X-Ray structure determination of [Au(C5H5NS)2]ClO4 Rafael Usón, Antonio Laguna, Mariano Laguna, Josefina Jiménez, Maria P. Gómez, Ana Sainz and Peter G. Jones, pp 3457 DOI:10.1039/DT9900003457

Synthesis of mononuclear complexes of Ru and Os and heterobimetallic M–M(M = Ru or Os; M= Rh, Ir, or Au) compounds with pyrazolate or imidazolate type ligands. X-Ray crystal structure of [(Ph3P)2(OC)HRu(µ-bim)Rh(cod)](bim = dianion of 2,2-bi-imidazole, cod = cyclo-octa-1,5-diene) María P. García, Ana M. López, Miguel A. Esteruelas, Fernando J. Lahoz and Luis A. Oro, pp 3465 DOI:10.1039/DT9900003465

Synthesis and characterization of trinuclear Schiff-base complexes containing sulphur dioxide or hydrogensulphite ions as bridging groups. Crystal structure of [Zn{(µ-CH3CO2)(salpd-µ-O,O)Cu}2][salpd = propane-1,3-diylbis(salicylideneiminate)] Chki Fukuhara, Kazuhiko Tsuneyoshi, Naohide Matsumoto, Sigeo Kida, Masahiro Mikuriya and Masayasu Mori, pp 3473 DOI:10.1039/DT9900003473

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 103. Carbaborane molybdenum and tungsten dimetal complexes Stephen J. Dossett, Ian J. Hart and F. Gordon A. Stone, pp 3481 DOI:10.1039/DT9900003481

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 104. Trimetal molybdenum and tungsten complexes containing 5-C2B9H9R2(R= H or Me) ligands; crystal structure of [NEt4][Mo2W(µ3-CC6H4Me-4)(µ-CO)(CO)7(PMe3)(5-C2B9H9Me2)] Stephen J. Dossett, Ian J. Hart, Massimino U. Pilotti and F. Gordon A. Stone, pp 3489 DOI:10.1039/DT9900003489

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 105. Alkylidyne tungsten and molybdenum complexes with pyrazolylmethane ligands Peter K. Byers and F. Gordon A. Stone, pp 3499 DOI:10.1039/DT9900003499

Low-temperature neutron-diffraction structure of [Ru(OH2)6]3+ in the caesium sulphate alum lattice CsRu[SO4]2·12H2O Stephen P. Best and J. Bruce Forsyth, pp 3507 DOI:10.1039/DT9900003507

Qualitative interpretation of Mössbauer data for some [1] ferrocenophanes; Fe–Pd dative bonding in [(SC5H4)2FePd (PPh3)] and Fe–Hg and Fe–H+ bonding in ferrocene Jack Silver, pp 3513 DOI:10.1039/DT9900003513

Dynamic behaviour of some metal carbonyl clusters in the solid state Dario Braga, Christopher E. Anson, Adrian Bott, Brian F. G. Johnson and Elisabeth Marseglia, pp 3517 DOI:10.1039/DT9900003517

Synthesis of new silyl-substituted triosmium clusters. The reactivity of the anion [Os3(CO)11{Si(OEt)3}]– towards Group 1B and 2B metals Brian F. G. Johnson, Jack Lewis and Magda Monari, pp 3525 DOI:10.1039/DT9900003525

Polyazamacrocycles. Part 7. Kinetics of aquation of trans-dichloro and trans-chloro (nitro) complexes of cobalt (III) with tetra-aza macrocycles Ramesh Bembi, Tapashi G. Roy, Amrit K. Jhanji and Alka Maheswari, pp 3531 DOI:10.1039/DT9900003531

Spectroscopy and electrical conductivity of [Au(C3S5)2]n– and [Au(C3Se5)2]n–(n= 0–1) complexes and X-ray crystal structure of [NBun4][Au(C3S5)2] Gen-Etsu Matsubayashi and Akito Yokozawa, pp 3535 DOI:10.1039/DT9900003535

Model studies of benzimidazole complexes of Cu, Zn, and Cd. Crystal structures of 1,5-bis(benzimidazol-2-yl)-3-thiapentane complexes of CuBr2 and Cu(NO3)2 and nuclear magnetic resonance studies of exchange of 1,6-bis(benzimidazol-2-yl)-2,5-dithiahexane on Cd Joyce C. Lockhart, William Clegg, M. N. Stuart Hill and David J. Rushton, pp 3541 DOI:10.1039/DT9900003541

Notes. Upon the fluxionality of [RhCl(PPh₃)(Ph₂PO₂CCHCHMe)]
Derek J. Irvine, Andrzej F. Borowski and David J. Cole-Hamilton,Â
pp 3549 DOI:10.1039/DT9900003549

Synthesis and characterization of the alkoxycarbonyl complexes [(C5Me5)M(µ-pz)(µ-I)2Rhl(CO2R)(CO)](M = Rh, R = Me or Et; M = Ir, R = Me; pz = pyrazolate). Molecular structure of [(C5Me5)Ir(µ-pz)(µ-I)2Rhl(CO2Me)(CO)] Daniel Carmona, Fernando J. Lahoz, Luis A. Oro, Josefa Reyes and M. Pilar Lamata, pp 3551 DOI:10.1039/DT9900003551

Functionalizable Schiff base complexes of lanthanum. Synthesis and crystal structures of [La2L4(thf)2(µ-Cl)2] and [La(L)2(HL)Cl][HL =N-(2,4,6-trimethylphenyl)salicylideneimine, HL=N-(2-dimethylaminoethyl)-salicylideneimine, and thf = tetrahydrofuran] Philippe Blech, Carlo Floriani, Angiola Chiesi-Villa and Carlo Guastini, pp 3557 DOI:10.1039/DT9900003557

Additions and corrections David J. Evans, Adrian Hills, David L. Hughes, Geoffrey J. Leigh, Andrew Houlton and Jack Silver, pp 3563 DOI:10.1039/DT9900003563

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX043

Issue 12

Front cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FX045

Contents pages J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000FP057

A study of the comparative donor properties to CuII of the terminal amino and imidazole nitrogens in peptides Leslie D. Pettit, Simon Pyburn, Wojciech Bal, Henryk Kozlowski and Michel Bataille, pp 3565 DOI:10.1039/DT9900003565

Charge distribution in Schiff-base biquinone complexes. Electrochemical, spectroelectrochemical and electron spin resonance studies of complexes of CoIII, NiII, ZnII, CuII, and CdII with the N-(2-hydroxy-3,5-di-t-butylphenyl)-4,6-di-t-butyl-o-benzoquinone imine ligand system in CH2Cl2 Bhaskar G. Maiya, Yuanjian Deng and Karl M. Kadish, pp 3571 DOI:10.1039/DT9900003571

Syntheses of some transition-metal complexes containing the tripodal ligand HB(PriMeC3N2H)3 and the X-ray crystal structure of [Mo(No)-{HB(3-Pri-5-MeC3N2H)3}(OEt)2] Mecededes Cano, Jose V. Heras, Swiatoslaw Trofimenko, Angeles Monge, Enrique Gutierrez, Christopher J. Jones and Jon A. McCleverty, pp 3577 DOI:10.1039/DT9900003577

The heteronuclear cluster chemistry of the Group 1B metals. Part 15. Effect of the nature of the Group 1B metals and the cone angles of the attached phosphine ligands on the metal framework structures of heteronuclear cluster compounds. Synthesis, structures, and dynamic behaviour of the bimetallic hexanuclear cluster compounds [M2Ru4H2(CO)12(PR3)2](M = Cu, R = CHMe2 or C6H11; M = Ag or Au, R = CHMe2, C6H11, or CMe3) Carolyn J. Brown, Paul J. McCarthy and Ian D. Salter, pp 3583 DOI:10.1039/DT9900003583

Reductive cleavage of the C-S bond in [Ni2(cp)2(µ-SR)2](cp =-C5H5) by LiAlH4. Crystal structures of [Ni2(cp)2(µ-SPh)2] and [Ni2(cp)2{µ-o-(SCH2)2- C6H4}] Ngan-Fong Ho, Thomas C. W. Mak and Tien-Yau Luh, pp 3591 DOI:10.1039/DT9900003591

Charge density, covalence, and the ground state of the [Fe(CN)6]3- ion in Cs2K[Fe(CN)6] Brian N. Figgis, Edward S. Kucharski, Jacqui M. Raynes and Philip A. Reynolds, pp 3597 DOI:10.1039/DT9900003597

Tin-119 Mössbauer titration of dimethyl- and trimethyl-tin(IV) hydroxides with model ligands mimicking nucleic acid phosphate sites, and with deoxyribonucleic acid Renato Barbieri, Arturo Silvestri and Vincenzo Piro, pp 3605 DOI:10.1039/DT9900003605

Chemistry of the diaminochalcogenophosphinic chloride-aluminium trichloride system: preparation and crystal structures of new chalcogenophosphonium cations Neil Burford, Rupert E. v. H. Spence and Robin D. Rogers, pp 3611 DOI:10.1039/DT9900003611

Stereoselective addition reactions of diphenylphosphine: meso- and rac-1,2-diphenyl-1,2-bis(diphenylphosphino)ethane and their Group 6 metal tetracarbonyl complexes. Crystal structures of the molybdenum derivatives Jonathan L. Bookham, William McFarlane, Mark Thornton-Pett and Simon Jones, pp 3621 DOI:10.1039/DT9900003621

Preparation, crystal structure and kinetics of acid hydrolysis of an isomer of [Cr(picdien)Cl][ZnCl4][picdien = 1,9-bis(2-pyridyl)-2,5,8-triazanonane] V. Ugalde-Saldivar, Maria A. Luna-Canut, Martha E. Sosa-Torres, Maria J. Rosales-Hoz, R. A. Toscano and Martin L. Tobe, pp 3629 DOI:10.1039/DT9900003629

Manganese(III) complexes of 1,2-bis(2-pyridinecarboxamido)benzene: synthesis, spectra, and electrochemistry Manabendra Ray, Subhasish Mukerjee and Rabindranath Mukherjee, pp 3635 DOI:10.1039/DT9900003635

Lipoxygenase-like function of some binuclear iron(III) complexes Yuzo Nishida and Kasumi Yamada, pp 3639 DOI:10.1039/DT9900003639

Electrochemical synthesis of neutral divalent transition-metal complexes with tetradentate thioether-benzimidazole-containing ligands Rufina Bastida, Sira Gonzalez, Teresa Rodriguez, Antonio Sousa and David E. Fenton, pp 3643 DOI:10.1039/DT9900003643

Tripodal benzimidazolate complexes of tricarbonylmolybdenum(0) and of iron(III) Jonathan D. Crane and David E. Fenton, pp 3647 DOI:10.1039/DT9900003647

Electron paramagnetic resonance study of the [W(CO)4{P(OMe)3}]- radical anion trapped in a single crystal of [N(PPh3)2][W(CO)4H{P(OMe)3}] Rosemary C. Hynes, Keith F. Preston, Jerry J. Springs and Antony J. Williams, pp 3655 DOI:10.1039/DT9900003655

Behaviour of polynuclear ruthenium carbonyl carboxylates in the presence of hydrogen and/or carbon monoxide Piero Frediani, Mario Bianchi, Antonella Salvini and Franco Piacenti, pp 3663 DOI:10.1039/DT9900003663

Stoicheiometry, kinetics, and mechanism of the oxidation of hyponitrous acid by iodine in acetate buffers Pankaj Bhatnagar, Rama K. Mittal and Yugal K. Gupta, pp 3669 DOI:10.1039/DT9900003669

Dimer and trimer calix[4]arenes containing multiple metallocene redox-active centres. Single-crystal X-ray structure of a bis(ferrocene)-bis(p-t-butylcalix[4]-arene) hydrophobia host molecule Paul D. Beer, Anthony D. Keefe, Alexandra M. Z. Slawin and David J. Williams, pp 3675 DOI:10.1039/DT9900003675

Synthesis of mono- and di-nuclear palladium(II) complexes containing ylide ligands [PPh2(CHCO2R)2]-(R = Me or Et). Crystal structures of [Pd{(CHCO2Et)2PPh2}2], [Pd{(CHCO2Et)2PPh2}Cl(PPh3)], and [Pd{(CHCO2Et)2PPh2}(NC5H5)2]ClO4 José Vicente, María-Teresa Chicote, Isabel Saura-Llamas, María-José López-Muñoz and Peter G. Jones, pp 3683 DOI:10.1039/DT9900003683

Nickel K-edge extended X-ray absorption fine structure studies of tris(diamine) complexes of nickel(II) and their halogen oxidation products John Evans, William Levason and Richard J. Perry, pp 3691 DOI:10.1039/DT9900003691

Thionation of 1,1-dibenzoylferrocene: crystal and molecular structure of 1,4-diphenyl-1,4-epithio-2,3-dithia[4](1,1) ferrocenophane George Ferguson, William Bell and Christopher Glidewell, pp 3697 DOI:10.1039/DT9900003697

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 106. Synthesis and reactions of the alkylidyne complexes [M(CR)(CO)2{(C6F5)AuC(pz)3}](M = WorMo, R = alkyloraryl, pz = pyrazol-1-yl); crystal structure of [WPtAU(C6F5)(µ3-CMe)(CO)2(PMe2Ph)2{(C6F5)AuC(pz)3}] Peter K. Byers, Nicholas Carr and F. Gordon A. Stone, pp 3701 DOI:10.1039/DT9900003701

Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 107. Reactions of diphenylphosphine with molybdenumtungsten dimetal complexes; crystal structures of [MoW(µ-PPh2){µ-C(OH)C(C6H4Me-4)}-(CO)(7-C7H7)(5-C2B9H11)]and[MoW(µ-PPh2)(CO)3(5-C9H7){5-C2B9H8(CH2C6-H4Me-4)Me2}] Stephen A. Brew, Stephen J. Dossett, John C. Jeffery and F. Gordon A. Stone, pp 3709 DOI:10.1039/DT9900003709

Studies on the nature of cobalt(III) acetate Antony B. Blake, John R. Chipperfield, Seng Lau and David E. Webster, pp 3719 DOI:10.1039/DT9900003719

Terminal phosphido-complexes of co-ordinatively saturated and unsaturated platinum(II) Andreas Handler, Paul Peringer and Ernst P. Müller, pp 3725 DOI:10.1039/DT9900003725

Formation of the TcN multiple bond from the reaction of ammonium pertechnetate with S-methyl dithiocarbazate and its application to the preparation of technetium-99m radiopharmaceuticals Adriano Duatti, Andrea Marchi and Roberto Pasqualini, pp 3729 DOI:10.1039/DT9900003729

Synthesis, electrochemistry, and reactivities of trans-[RuVI(L)O2]2+(L =N,N-dimethyl-N,N-bis(2-pyridylmethyl)propylenediamine Chi-Ming Che, Wai-Tong Tang and Chi-Keung Li, pp 3735 DOI:10.1039/DT9900003735

Electron-transfer chemistry of the luminescent excited state of trans-dioxo-osmium(VI) Vivian Wing-Wah Yam and Chi-Ming Che, pp 3741 DOI:10.1039/DT9900003741

Novel luminescent polynuclear gold(I) phosphine complexes. Synthesis, spectroscopy, and X-ray crystal structure of [Au3(dmmp)2]3+[dmmp = bis(dimethylphosphinomethyl)methylphosphine] Vivian Wing-Wah Yam, Ting-Fong Lai and Chi-Ming Che, pp 3747 DOI:10.1039/DT9900003747

Structural and far-infrared studies of compounds containing the novel trinuclear lodocuprate(I) complex [Cu3(AsPh3)3I4]- Graham A. Bowmaker, Annamaria Camus, Robert D. Hart, John D. Kildea, Brian W. Skelton and Allan H. White, pp 3753 DOI:10.1039/DT9900003753

Structural reorganizations accompanying the nickel(II)-nickel(I) redox change in nickel complexes with the tripodal ligand MeC(CH2PPh2)3(triphos, L). X-Ray crystal structure of [NiL(I)]2[As6I8] Piero Zanello, Arnaldo Cinquantini, Carlo A. Ghilardi, Stefano Midollini, Simonetta Moneti, Annabella Orlandini and Alessandro Bencini, pp 3761 DOI:10.1039/DT9900003761

Synthesis and characterization of dinuclear rhodium complexes containing (benzylthiomethyl)diphenylphosphine as the bridging ligand. Structure of the novel rhodium(II) complex [Rh2Cl4(CO)2(µ-PhCH2SCH2PPh2)2] Yoshio Fuchita, Yoshihisa Ohta, Katsuma Hiraki, Masanori Kawatani and Nobuaki Nishiyama, pp 3767 DOI:10.1039/DT9900003767

Nuclear magnetic resonance studies of complexes of aluminium(III), gallium(III), and indium(III) with disulphonated 2,2-dihydroxyazobenzene ligands in aqueous solution Dennis F. Evans and Nobuhiko Iki, pp 3773 DOI:10.1039/DT9900003773

Interconversion of oxo and imido ligands at a dimolybdenum centre: molecular and electronic structure of [{Mo(-C5H4Me)(NPh)(µ-NPh)}2] Malcolm L. H. Green, Graeme Hogarth, Peter C. Konidaris and Philip Mountford, pp 3781 DOI:10.1039/DT9900003781

Synthesis and electrochemistry of crown ether dithiolene complexes Malcolm L. H. Green, William B. Heuer and Graham C. Saunders, pp 3789 DOI:10.1039/DT9900003789

Synthesis of the WW triply bonded dimers [W2(-C5H4R)2X4](X = Cl, R = Me or Pri; X = Br, R = Pri) and X-ray crystal structures of [W(-C5H4Pri)Cl4] and [W2(-C5H4Pri)2Cl4] Malcolm L. H. Green, Jason D. Hubert and Philip Mountford, pp 3793 DOI:10.1039/DT9900003793

Bis(diphenylphosphino)methane-assisted synthesis of iron-platinum and -palladium clusters. Crystal structures of [Fe2Pt(µ-dppm)(CO)8] and [FePt2(µ-dppm)(CO)6](dppm = Ph2PCH2PPh2) Pierre Braunstein, Jean-Luc Richert and Yves Dusausoy, pp 3801 DOI:10.1039/DT9900003801

Synthesis and characterization by Raman spectroscopy of AsBr4AsF6; its thermodynamic and kinetic stability and that of related salts Thomas Klapötke and Jack Passmore, pp 3815 DOI:10.1039/DT9900003815

Geometrical isomer preference of RuII and RuIII: chemistry and structure of a RuS4P2 family. Crystal structure of [Ru(PhCH2SCS2)2(PPh3)2] Amitava Pramanik, Nilkamal Bag Goutam, Kumar Lahiri and Animesh Chakravorty, pp 3823 DOI:10.1039/DT9900003823

Synthesis and structure of a trinuclear manganese(II) complex containing low-spin metal Surajit Chattopadhyay, Partha Basu, Samudranil Pal and Animesh Chakravorty, pp 3829 DOI:10.1039/DT9900003829

Crystal structure and electronic properties of dibromo- and dichloro-tetrakis[µ3-bis(2-pyridyl)amido]tricopper(II) hydrate Liang-Ping Wu, Pat Field, Tony Morrissey, Clair Murphy, Pat Nagle, Brian Hathaway, Charles Simmons and Peter Thornton, pp 3835 DOI:10.1039/DT9900003835

Ruthenium thioether chemistry: the synthesis and structure of a host-guest complex [Ru([9]aneS3)2][BPh4]2·2Me2SO, and of [Ru([9]aneS3)2][BPh4]2·2MeNO2 and [Ru([18]aneS6)][BPh4]2([9]aneS3=1,4,7-trithiacyclononane, [18]aneS6= 1,4,7,10,13,16-hexathiacyclo-octadecane) Michael N. Bell, Alexander J. Blake, Alan J. Holder, Timothy I. Hyde and Martin Schröder, pp 3841 DOI:10.1039/DT9900003841

Platinum metal complexes of mixed thia/oxa ionophores. The synthesis and single-crystal X-ray structures of [Pd([15]aneS2O3)2][PF6]2 and [RuCl(PPh3)([15]aneS2O3)2]PF6·H2O ([15]aneS2O3= 1,4,7-trioxa-10,13-dithiacyclopentadecane) Alexander J. Blake, Gillian Reid and Martin Schröder, pp 3849 DOI:10.1039/DT9900003849

Notes. Chemical and structural investigations on bismuth complexes of 2,6-di-acetylpyridine bis(2-thenoylhydrazone) and 2,6-diacetylpyridine bis(thiosemicarbazone) L. P. Battaglia, A. Bonamartini Corradi, C. Pelizzi, G. Pelosi and P. Tarasconi, pp 3857 DOI:10.1039/DT9900003857

Back cover J. Chem. Soc., Dalton Trans. DOI:10.1039/DT99000BX047