Tetranuclear
Ruthenium(II) Complex with a Dinucleating
Ligand Forming Multi-Mixed-Valence States
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Abstract
A square-shaped
tetranuclear ruthenium(II) complex, [Ru<sup>II</sup><sub>4</sub>Cl<sub>5</sub>(bpmpm)<sub>2</sub>]<sup>3+</sup> [<b>1</b>; bpmpm =
4,6-bis[[<i>N</i>,<i>N</i>-bis(2′-pyridylmethyl)amino]methyl]pyrimidine],
exhibited four reversible and stepwise one-electron-oxidation processes:
chemical oxidation of <b>1</b> 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
