Synthesis of five-coordinate Pt(II) complexes containing organogermanium fragments in axial position. Structure of [PtCl(GePh2Cl)(2,9-Me-2-1,10-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-ph en)(CH2=CH2)], which form the first class of five-coordinate platinum(II) c omplexes bearing organogermanium fragments, have been obtained by oxidative addition of GeMenC4-n (n = 1, 2, 3) and GePh2Cl2 to the strongly nucleophi lic [Pt-0(2,9-Me-2-1,10-phen)(CH2=CH2)] The X-ray crystal structure of [PtC l(GePh2Cl)(dmphen)(CH2=CH2)] discloses trigonal bipyramidal coordination wi th the anionic ligands in the axial sites. A significant trans-influence ex erted by the organogermanium fragment has been observed and compared with t hat of the corresponding C, Sn, Pb and Hg groupings in analogous compounds, (C) 1999 Elsevier Science S.A. All rights reserved.