Redox Properties of Binuclear Rhenium-Platinum Vinylidene Complexes with Phosphorus containing Ligands
Galina V Burmakina, Victor V Verpekin, Dmitry V Zimonin, Oleg S Chudin, Ruslan O Ergaev, Anatoly I Rubaylo
Abstract
The redox properties of new binuclear μ-vinylidene complexes Cp(CO)2RePt(μ-C1=C2HPh)LL′ [L = СO, L′ = PPh3 (1); L = СO, L′ = P(OPr-i)3 (2); L = L′ = PPh3 (3); L = L′ = P(OPr-i)3 (4)] were studied by electrochemical methods at a platinum, a glassed carbon and a dropping mercury electrodes in acetonitrile solutions. It was established that one-electron oxidation of 3 and 4 results in a cleavage of the Re-Pt and Pt-C1 bonds affording vinylidene complex Cp(CO)2Re=C=CHPh and [PtL2] fragments. In contrast to complexes 3 and 4, one-electron oxidation of 1 and 2 is reversible, indicating the greater electrochemical stability of lasts relative to 3 and 4.