THE SYNTHESIS OF OLEFIN, CARBONYL AND THIOLATE COMPLEXES OF PLATINUM(IV) IN THE [(ETA(5)-C5ME5)PT(IV)] SYSTEM - CRYSTAL AND MOLECULAR-STRUCTURE OF (ETA(5)-C5ME5)PTME2[S(P-CH3(C6H4)]

A number of CpPtMe2X and Cp*PtMe2(L)(+)(OTf)(-) complexes have been p repared [Cp = eta(5)-C5Me5; OTf = OSO2CF3; X = OTf, I, N-3, S(p-tol); L = CO, C2H4, CH2=CHMe, NH3, NH2But]. The complexes CpPtMe2(CO)(+)(O Tf)(-), CpPtMe2(C2H4)(+)(OTf)(-), and Cp*PtMe2(CH2=CHMe)(+)(OTf)(-) r epresent a rare type of compound in which a pi acid ligand is coordina ted to a high valent metal center predominantly through sigma-donation and pi-backbonding plays only a limited role in the metal-ligand inte raction. The arylthiolate complex, CpPtMe2[S(p-tol)], has been struct urally characterized by X-ray diffraction. (C) 1998 Elsevier Science L td. All rights reserved.