title: Tetranuclear ruthenium(II) complex with a dinucleating ligand forming multi-mixed-valence states.
abstract: A square-shaped tetranuclear ruthenium(II) complex, [Ru(II)4Cl5(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.
authors.affiliation: Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Ohzu
authors.forename: Tomoya
authors.initials: T
authors.lastname: Ishizuka
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kotani
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Shiota
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yoshizawa
authors.forename: Takahiko
authors.initials: T
authors.lastname: Kojima