Synthesis of five-coordinate Pt(II) complexes containing organogermanium fragments in axial position.: Structure of [PtCl(GePh2Cl)(2,9-Me2-1,10-phen)(CH2=CH2)]

The family of complexes of formula [PtCl(ERxCly)(N,N-chelate)(olefin)] (E = Sn, Pb, Hg) including organometal groups hound to Pt(LI) has been expanded to include Ge derivatives. The complexes [PtCl(GeRnCl3-n)(2,9-Me-2-1,10-phen)(CH2=CH2)], which form the first class of five-coordinate platinum(II) complexes bearing organogermanium fragments, have been obtained by oxidative addition of GeMenC4-n (n = 1, 2, 3) and GePh2Cl2 to the strongly nucleophilic [Pt-0(2,9-Me-2-1,10-phen)(CH2=CH2)] The X-ray crystal structure of [PtCl(GePh2Cl)(dmphen)(CH2=CH2)] discloses trigonal bipyramidal coordination with the anionic ligands in the axial sites. A significant trans-influence exerted by the organogermanium fragment has been observed and compared with that of the corresponding C, Sn, Pb and Hg groupings in analogous compounds, (C) 1999 Elsevier Science S.A. All rights reserved.