THE SYNTHESIS AND CHARACTERIZATION OF SOME DIVINYLDISILOXANE-(TERTIARY PHOSPHINE) COMPLEXES OF PLATINUM(0) AND NICKEL(0)

Reaction of the platinum(0) complex [{Pt(LL)}(2)(mu-LL)] [LL=(ViMe(2)S i)(2)O] with PR(3) (R=C(6)H(4)Me-p or C6H11-c) or PPh(2)CH(2)CBu(2)(t) OH yields, by displacement of the bridging vinylsiloxane ligand, compl exes having both a phosphine and a vinylsiloxane as co-ligands. There is evidence for interaction between the platinum atom and the OH moiet y in [Pt(LL)(PPh(2)CH(2)CBu(2)(t)OH)]. Reaction of the analogous nicke l(0) complex [{Ni(LL)}(2)(mu-LL)] with a tertiary phosphine yields [Ni (LL)PR(3)] (R = Ph, C6H11-c or C(6)H(4)Me-p). The zinc reduction of [N i(PPh(3))(2)Cl-2] in the presence of (ViPh(2)Si)(2)O (PLL) yields the complex [Ni(PLL)PPh(3)]. X-ray molecular structures of the crystalline complexes [Pt(LL)P(C(6)H(4)Me-p)(3)], [Pt(LL)(PPh(2)CH(2)CBu(2)(t)OH) ], [Ni(LL){P(C6H11-c)(3)}]and [Ni(PLL)(PPh(3))] show a trigonal planar metal environment and chair conformation for the M(LL) and M(PLL) uni ts.