SYNTHESIS AND CHARACTERIZATION OF MONONUCLEAR PALLADIUM(II) AND PLATINUM(II), DINUCLEAR PALLADIUM(I) AND PLATINUM(I), AND HETEROBIMETALLIC (PT-HG OR PT-AG) COMPLEXES CONTAINING 1,1-BIS(DIPHENYLPHOSPHINO)ETHANEAS LIGAND

The complex [Pd(dpmMe)(2)]Cl-2 [dpmMe = 1,1-bis-(diphenylphosphino) et hane] was prepared from [PdCl2- (PhCN)(2)], whilst [Pd(2)X(2)(mu-dpmMe )(2)] complexes were prepared from [PdCl(2)PhCN)(2)] and [Pd(PPh(3))(4 )] (X = Cl), [PdBr(eta(3)-C3H5)](2) (X = Br), or (Pd2Cl2(mu-dpmMe)(2)] (X = I). Reaction of [Pd2Cl2(mu-dpmMe)(2)] with MeO(2)C-C=CCO(2)Me(L) gave the A-frame complex (PdCl2(mu-L) (mu-dpmMe)(2)]. The complexes [ PtCl2(dpmMe)] and [Pt(dpmMe)(2)]Cl-2 were prepared from [PtCl2(Bu(t)CN )(2)]. Treatment of either [PtCl2(dpmMe)] with PhC=CLi or [Pt(dpmMe)(2 )]Cl-2 with MeONa gave [Pt(Ph(2)PCMe . PPh(2))(2)]. Reaction of [PtCl2 (Bu(t)CN)(2)] with [Pt(PPh(3))(4)] and dpmMe gave a mixture of [Pt2Cl2 (mu-dpmMe)(2)] and [PtCl2(dpmMe)]. The heterobimetallic complexes [Pt( C=CPh)(2) (mu-dpmMe)(2)MX] (MX=HgCl2 or AgCl) were made from the react ion of [Pt(dpmMe)(2)]Cl-2 with Hg(C=CPh)(2) or Ag(C=CPh), respectively . Reaction of the Pt-Hg complex with Na2S gave [Pt(C=CPh)(2) (eta(1)-d pmMe)(2)]. Oxidative addition of MeI to [PtMe(2) . (dpmMe)] gave two P t-IV isomers of the formula [PtMe(3)I(dpmMe)].