SYNTHESIS AND REACTIVITY OF ORGANOPLATINUM-RHENIUM HETEROBIMETALLIC COMPLEXES HAVING SULFUR LIGANDS

New organoplatinum-rhenium heterobimetallic complexes (organic ligand = Me (1), Et (2), CH(2)Ph (3), Ph (4)) with sulfur ligands have been p repared and characterized by IR, H-1 and C-13{H-1} NMR, elemental anal ysis, and chemical reactions. Complex 1 was thermally more stable than related PtMeCl(cod) (5) and PtMe(SPh)(cod) (6). On the other hand, th ermolysis reaction of 2 in diphenylmethane at 80 degrees C afforded et hylene in a larger yield than those for PtEtCl(cod) (7) and PtEt(SPh)( cod) (8). From the estimation of electronegativity using H-1 NMR data, it was suggested that Pt in 2 was more electron deficient than in 7 a nd 8. It is thus proposed that SRe(CO)(4) units in 2 decreases the ele ctron density at Pt, resulting in the promotion of apparent beta-H eli mination to form ethylene.