The dinuclear complex [(NH3)5RuLRu(NH3)5][Cl]4, where L2−= 1,4-dicyanamido-2,3,5,6-tetrachlorobenzene dianion, has been prepared. UV-vis-near-IR spectroscopy and electrochemical data strongly indicate that its mixed-valence derivative is a weakly coupled case, with Habestimated to be 185 cm−1. It is suggested that coupling between the metal centers via the low-energy LMCT system is symmetry forbidden, while coupling via the high-energy LMCT system is energetically unfavorable.

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Journal Inorganic Chemistry
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Aquino, M.A.S. (Manuel A. S.), Bostock, A.E. (Ann E.), & Crutchley, R. (1990). A pentaammineruthenium mixed-valence complex with 1,4-dicyanamido-2,3,5,6-tetrachlorobenzene dianion as bridging ligand: Symmetry-attenuated electronic coupling between redox sites. Inorganic Chemistry, 29(19), 3641–3644.