Synthesis and reactivity of organoplatinum-rhenium heterobimetallic complexes having sulfur ligands

Article abstract of DOI:10.1016/1381-1169(95)00231-6

New organoplatinum-rhenium heterobimetallic complexes (organic ligand = Me (1), Et (2), CH₂Ph (3), Ph (4)) with sulfur ligands have been prepared and characterized by IR, ¹H and ¹³C{¹H} NMR, elemental analysis, and chemical reactions. Complex 1 was thermally more stable than related PtMeCl(cod) (5) and PtMe(SPh)cod) (6). On the other hand, thermolysis reaction of 2 in diphenylmethane at 80°C afforded ethylene in a larger yield than those for PtEtCl(cod) (7) and PtEt(SPh)(cod) (8). From the estimation of electronegativity using ¹H NMR data, it was suggested that Pt in 2 was more electron deficient than in 7 and 8. It is thus proposed that SRe(CO)₄ units in 2 decreases the electron density at Pt, resulting in the promotion of apparent β-H elimination to form ethylene.