Tetranuclear Ruthenium(II) Complex with a Dinucleating Ligand Forming Multi-Mixed-Valence States

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.一种呈方形结构的四核钌(II)配合物[RuII4Cl5(bpmpm)2]3+ [1；bpmpm=4,6-双[[N,N-双(2'-吡啶甲基)氨基]甲基]嘧啶]，存在四步可逆的逐步单电子氧化过程：对该配合物1进行化学氧化可得到三种不同的混合价态，其中一种价态的电荷在两个钌中心上发生部分离域，该现象可通过观测到的区间电荷转移吸收带得到证实，该体系被归类为罗宾-戴（Robin–Day）II类。