Preparation and Spectroscopic Properties of the [Re2(C3S4Se)5]2- Anion Complex and Electrical Conductivities of the Oxidized Species [C3S4Se2- = 1,3-Dithiole-2-selone-4,5-dithiolate(2-)

Abstract

The dinuclear rhenium(IV) complexes with the C3S4Se-ligand [1,3-dithiole-2-selone-4,5- dithiolate(2-)], [PPh4]2- (1) and [NEt4]2[Re2(C3S4Se)5] (2), were prepared. Complex 2 was oxidized by a reaction with [Fe(C5H5)2][PF6] or [TTF]3[BF4]2 (TTF·+ = the tetrathiafulvalenium radical cation) and by the current-controlled electrolysis to yield [NEt4]x[Re2(C3S4Se)5] (x = 0.15 and 0.5) and [TTF][Re2(C3S4Se)5]. The compounds exhibit electrical conductivities of 3.3 x 10-3 - 9.3 x 10-4 S cm-1 for compact pellets at room temperature. Electrochemical and spectroscopic properties of the complexes are discussed on the basis of cyclic voltammetry and ESR, XPS and IR spectra as well as the magnetic susceptibility of the TTF salt.