Mixed-Valance chemistry in ruthenium is the transition metal choice to study electron transfer or exchange because low spin d5-d6 center from relatively stable coordinate complexes.1-3 Hush published the well-known basis of mixed-valence chemistry which focused on the two-state model.4 Creutz, Newton and Sutin reported a new aspect of the superexchange coupling model with the three-state system.5,6 Few reports provided significant points of real systems for superexchange coupling.7-9 The focus of this report is the synthesis and study of L-type tri-ruthenium complexes that exhibit interesting intervalence absorption and strong comproportionation between terminal metal centers. The electochemistry of △E1/2 between terminal centers for RU3(1) and Ru3(2) ranged between 0.12 and 0.13V.
