Tetranuclear Ruthenium(II) Complex with a Dinucleating Ligand Forming Multi-Mixed-Valence States
- Shingo Ohzu ,
- Tomoya Ishizuka ,
- Hiroaki Kotani ,
- Yoshihito Shiota ,
- Kazunari Yoshizawa , and
- Takahiko Kojima
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† Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
‡ Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
§ Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan
*E-mail: [email protected]
Abstract
A square-shaped tetranuclear ruthenium(II) complex, [RuII4Cl5(bpmpm)2]3+ [1; bpmpm = 4,6-bis[[N,N-bis(2′-pyridylmethyl)amino]methyl]pyrimidine], exhibited four reversible and stepwise one-electron-oxidation processes: chemical oxidation of 1 formed three different mixed-valence states, in one of which the charge is partially delocalized on the two Ru centers, to be evidenced by observation of an intervalence charge-transfer absorption band, categorized into the Robin–Day class II.