195448-90-9Relevant academic research and scientific papers
Neutral gold(I) complexes with mixed phosphorus ligands
Hollatz, Christian,Schier, Annette,Schmidbaur, Hubert
, p. 1333 - 1338 (1997)
The reaction of compounds (R3P)AuMe with diphenylphosphinous acid Ph2P(O)H affords methane and neutral complexes of the type (R3P)AuP(O)Ph2 (1a: R = Me; Ib: R = Ph; le: R = o-Tol). la, b are obtained in high yield, but the yield of le is lower owing to a side-reaction which leads to a different product: Ph2P(OH)-Au-P(O)Ph2 (2). The crystal structure of la was determined by a single-crystal X-ray diffraction study. The compound is a monomer with a linear P-Au-P' axis and the phosphane and phosphinite ligands in a staggered conformation. In solution (CHCl3, CH2Cl2) compounds la-c undergo a ligand redistribution, establishing equilibria that involve ionic isomers of the type [(R3P]2Au]++ [Au-(P(O)Ph2)2]-, which are readily identified through their NMR data. The analogous reaction of (R3P)AuMe with dimethylphosphite (MeO)2P(O)H gives methane and the corresponding dimethylphosphites of the type (R3P)AuP(O}(OMe)2 (3a: R = Me; 3b: R = Ph; 3c: R = o-Tol). The crystal structure of 3b has also been determined. It features a linear structure with an eclipsed conformation of the ligands. In polar solvents (CHCL3, methanol) there is again an equilibrium between neutral and ionic isomers, the latter comprising bis(phosphane)gold cations [(R3P)2Au]+ and (Au[P(O)-(OMe)2]2)- anions, as confirmed by NMR spectroscopy and mass spectrometry. VCH Verlagsgesellschaft mbH,.
