Cyclometalated organoplatinum(II) complexes: first example of a monodentate benzo[h]quinolyl ligand and a complex with bridging bis(diphenylphosphino)ethane

The cyclometalated complexes [Pt(ppy)R(SMe(2))] or [Pt(bhq)R(SMe(2))], where ppyH = 2-phenylpyridine, bhqH = benzo[h] quinoline and R = methyl or p-tolyl, react with bis(diphenylphosphino) ethane, dppe, in a 1 : 1 ratio to give the corresponding complexes [Pt(kappa(1)-C-ppy) R(dppe)] or [Pt(kappa(1)-C-bhq)R(dppe)], in which the ppy or bhq ligands are monodentate and dppe is chelating. The similar reaction in a 2 : 1 ratio gives the binuclear complexes [{Pt(ppy)R}(2)(mu-dppe)] or [{Pt(bhq)R}(2)(mu-dppe)], in which the dppe ligands are in the unusual bridging bidentate bonding mode.