Electrochemical behaviour of dicyanobis(2,2′-bipyridine) ruthenium(II) and dicyanobis(1,10-phenanthroline) ruthenium(II) complexes |
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| Authors: | S. Roffia M. Ciano |
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| Affiliation: | Centro di Studio di Elettrochimica Teorica e Preparativa, Istituto Chimico “G. Ciamician”, Università di Bologna, Bologna (Italy);C.N.R., Laboratorio di Fotochimica e Radiazioni d''Alta Energia, Bologna (Italy) |
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| Abstract: | The electrochemical behaviour of Ru(bipy)2(CN)2 and Ru(phen)2(CN)2 (bipy=2,2′-bipyridine; phen=1,10-phenanthroline) has been investigated in dimethylformamide. Both complexes exhibit one oxidation wave and three reduction waves. In the case of Ru(bipy)2-(CN)2 the anodic process and the first two cathodic processes involve one electron and are reversible in the time scale of polarographic and cyclic voltammetric experiments. The third reduction step is irreversible and has been attributed to the addition of three electrons to Ru(bipy)2(CN)2 followed by liberation of one or more ligands and reduction of liberated bipyridine. The features of the redox processes for the Ru(phen)2(CN)2 are similar to those found for the bipy complex except for the first reduction wave, which is complicated by adsorption phenomena. A qualitative MO discussion of the redox processes is also reported. |
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