Electrochemical investigation on the phosphine rhenium complexes [ReCl 3(PMe 2Ph) 3] and [ReCl 4(PMe 2Ph) 2] in an aprotic medium

Abstract

The cathodic and anodic behaviour of the complexes [ReCl 3(PMe 2Ph) 3] and [ReCl 4(PMe 2Ph) 2] has been studied at platinum and mercury electrodes in acetonitrile solvent. The reduction and oxidation products have been identified and both thermodynamic and kinetic aspects of the involved electrode mechanisms have been studied. In particular, new rhenium derivatives such as [ReCl 3(PMe 2Ph) 3] +. [ReCl 4(PMe 2Ph) 2] − and [ReCl 3(PMe 2Ph) 2(MeCN)] +, have been prepared. In addition the species [ReCl 4(PMe 2Ph) 2] has been obtained in a yield higher than that obtained by conventional chemical methods. The E 1 2 values of several redox couples of rhenium complexes have been calculated and compared with the corresponding values of the technetium ones; the stability of analogous rhenium and technetium compounds has been also discussed.