TRIMETHYLSILYLMETHYL GOLD(I) COMPLEXES - X-RAY STRUCTURE OF SIME3)PPH2CH2PPH2ME]CLO4-CENTER-DOT-0.25CH(2)CL(2)

The reaction of [AuCl(L)] (L = AsPh3 or PPh3) with Mg(CH2SiMe3)Cl give s the neutral complexes [Au(CH2SiMe3)L] [L = ASPh(3) (1) or PPh3 (2)]. Complex 1 undergoes substitution reactions with monodentate ligands t o afford mononuclear complexes [Au(CH2SiMe3)PPh3] or [Au(CH2SiMe3)L']C lO4 [L' = PPh2CH2PPh2Me (3) or PPh2CH2PPh2CH2C6F5 (4)]. If a potential ly bidentate ligand is used, the latter reaction gives mononuclear or dinuclear complexes, [Au(CH2SiMe3)dppe] (dppe = PPh2CH2CH2PPh2) (5) or [(Me3SiCH2)Au(L-L>Au(CH2SiMe3)] [L-L = dppm (6) or dppe (7)] (dppm = PPh2CH2PPh2), depending on the molar ratio. The structure of [Au(CH2Si Me3)PPh2CH2PPh2Me]ClO4 has been established by an X-ray diffraction st udy. (C) 1997 Elsevier Science S.A.