UV–Vis-NIR spectroelectrochemical study of tetrathiorhenate-bridged diruthenium complexes

The new compound (NEt4)[(acac)2RuS2ReS2Ru(acac)2] was characterized by cyclic voltammetry to reveal reversible reduction and oxidation behavior. While the redox products proved EPR silent, the UV–Vis-NIR spectroelectrochemistry showed shifted charge-transfer absorptions and a typical near-infrared intervalence (RuII → RuIII) band at λmax = 1725 nm (ε = 1800 M−1 cm−1) for the one-electron oxidized intermediate. The results are discussed in comparison to those obtained for [(bpy)2RuS2ReS2Ru(bpy)2]Cl3.

The suitability of a tetrathiometallate bridge for allowing electrochemical and electronic communication between two redox-active transition metal centers has been studied for the system [(acac)2Ru(μ-S)2Re(μ-S)2Ru(acac)2]n, n = 0. A typical inter-valence charge transfer absorption was observed by spectroelectrochemisttry in the near infrared.Figure optionsDownload as PowerPoint slide