Triangular trinuclear Co(III), Rh(III), and Ir(III) dithiolene complexes, [[M3(η5-C5Me5)3(S6C6)] (M = Co, Rh, Ir), which have not been obtained by the trimerization of mononuclear complexes, were synthesized via a new synthetic route, that is, the reaction of benzenehexathiol and [(η5-C5Me5)Co(CO)I2], [Rh(η5-C5Me5)Cl2]2 and [Ir(η5-C5Me5)Cl2]2, respectively, under basic conditions. Single crystal X-ray diffraction measurements were carried out and their crystal structures were determined. Electrochemical measurements revealed that the trinuclear complexes exhibit three-step one-electron redox reactions and form mixed valence complexes. Studies on the stabilities of their mixed valence states and the X-ray crystal structure analyses revealed that the through-bond internuclear electronic interaction and the aromaticity of central benzene ring decrease in the order of Co > Rh > Ir.
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