The synthesis and characterisation of some divinyldisiloxane-(tertiary phosphine) complexes of platinum(0) and nickel(0)

Article abstract of DOI:10.1016/S0022-328X(96)06676-4

Reaction of the platinum(0) complex [{Pt(LL)}₂(μ-LL)] [LL = (ViMe₂Si)₂O] with PR₃ (R = C₆H₄Me-p or C₆H₁₁-c) or PPh₂CH₂CBu^t₂OH yields, by displacement of the bridging vinylsiloxane ligand, complexes having both a phosphine and a vinylsiloxane as co-ligands. There is evidence for interaction between the platinum atom and the OH moiety in [Pt(LL)(PPh₂CH₂CBu^t₂OH)]. Reaction of the analogous nickel(0) complex [{Ni(LL)}₂(μ-LL)] with a tertiary phosphine yields [Ni(LL)PR₃] (R = Ph, C₆H₁₁-c or C₆H₄Me-p). The zinc reduction of [Ni(PPh₃)₂Cl₂] in the presence of (ViPh₂Si)₂O (PLL) yields the complex [Ni(PLL)PPh₃]. X-ray molecular structures of the crystalline complexes [Pt(LL)P(C₆H₄Me-p)₃], [Pt(LL)(PPh₂CH₂CBu^t₂OH)], [Ni(LL){P(C₆H₁₁-c)₃}] and [Ni(PLL)(PPh₃)] show a trigonal planar metal environment and chair conformation for the M(LL) and M(PLL) units.