Synthesis and characterization of heterodinuclear RuPt and IrPt complexes containing pyrazolate bridging ligands. Crystal structure of [(eta(5)-C5Me5)Ir(mu-pz)(3)PtMe3] (pz = pyrazolate)

The reaction of the metallo-ligand [Ru(eta(6)-p-cymene)(pz)(2)(Hpz)] with t he platinum complex [{PtIMe3}(4)] affords mixtures of the heterodinuclear c omplexes [(eta(6)-p-cymene)Ru(mu-pz)(3)PtMe3] (1) and [(eta(6)-p-cymene)Ru( mu-pz)(2)(mu-I)PtMe3] (2). The reaction of the iridium derivative [Ir(eta(5 )-C5Me5)(pz)(2)(Hpz)] with [{PtIMe3}(4)] gives [(eta(5)-C5Me5)Ir(mu-pz)(2)( mu-I)PtMe3] (3). Both [Ru(eta(6)-p-cymene)(pz)(2)(Hpz)] and [Ir(eta(5)-C5Me 5)(pz)(2)(Hpz)] react with [{PtIMe3}(4)] in the presence of NaOH yielding 1 and [(eta(5)-C5Me5)Ir(eta-pz)(3)PtMe3] (4), respectively. While [Ru(eta(6) -p-cymene)(pz)(2)(Hpz)] reacts with [PtBr2Me2Sx] to give mixtures of [(eta( 6)-p-cymene)Ru(mu-pz)(3)PtBrMe2] (5) and [(eta(6)-p-cymene)Ru(mu-pz)(2)(mu- Br)PtBrMe2] (6), the reaction of [Ir(eta(5)-C5Me5)(pz)(2)(Hpz)] with [PtBr2 Me2Sx] gives [(eta(5)-C5Me5)Ir(mu-pz)(2)(mu-Br)PtBrMe2] (7) as the sole pro duct. All species were characterized in solution by H-1-NMR spectroscopy. T he crystal structure of complex 4 has been determined by single-crystal X-r ay diffraction. (C) 2000 Elsevier Science S.A. All rights reserved.