The novel bridging ligand 3,6-bis(phenylcyanamido)-1,2,4,5-tetrazine (tdpcH2) and its dinuclear complex [{Ru(ttpy)(bpy)}2(μ-tdpc)][PF6]2 were prepared and characterized by elemental analysis and 1H NMR spectroscopy. Cyclic voltammetry and vis-NIR and IR spectroelectrochemistry of [{Ru(ttpy)(bpy)}2(μ-tdpc)]2+ showed that [{Ru(ttpy)(bpy)}2(μ-tdpc)]3+ is a Class II mixed-valence system with metal-metal coupling of 400 cm-1 assuming a transition dipole moment length of 21 Å. DFT calculations of tdpc2- suggested that the stability of the HOMO results in weak metal-metal coupling via the hole-superexchange mechanism.

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Keywords Mixed-valence, Ruthenium, Spectroelectrochemistry
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Journal Canadian Journal of Chemistry
Habibagahi, F. (Fatemeh), & Crutchley, R. (2014). Mixed-valence properties of a dinuclear ruthenium complex bridged by bis(phenylcyanamido)tetrazine. Canadian Journal of Chemistry, 92(11), 1081–1085. doi:10.1139/cjc-2014-0307