The pyrimidine bridged binuclear complex (CNhFepymRu(NH 3)5' (I) was prepared in aqueous solution by mixing cquimolar of Fe(CN)50H13. and Ru(NH 3)spym;!+. Its mixed valence state molecule (CN)5FepymRu(NHJh(II) was obtained upon oxidation of I by one equivalent of peroxydisulfate ion. Both binuclear complexes and corresponding Fe(II) and Ru(lI) mononuclear complexes displayed a metal-to-ligand charge transfer absorption in 400-450 nm region. Rate constants of formation and dissociation of I and II were measured, and the values of k, (-10 3M· l s· l ) and k.l (-10.
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