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Synthesis and proton transfer-linked redox tuning of ruthenium(II) complexes with tridentate 2,6-bis(benzimidazol-2-yl)pyridine ligands
Journal article

Synthesis and proton transfer-linked redox tuning of ruthenium(II) complexes with tridentate 2,6-bis(benzimidazol-2-yl)pyridine ligands

Xiao Xiaoming, Masa-aki Haga, Takeko Matsumura-Inoue, Yu Ru, Anthony W Addison and Kenji Kano
Dalton Transactions, (16), pp 2477-2484
1993

Abstract

New ruthenium complexes of two tridentate ligands 2,6-bis(benzimidazol-2-yl)pyridine (L 7 ) and 2,6-bis(1-methylbenzimidazol-2-yl)pyridine (L 8 ) have been synthesised. Proton and 13 C NMR spectroscopy served well for their characterization, and the observed change. Proton chemical shift yields information about the electron distribution accompanying deprotonation of the ligands. The [RuL 7 2 ] n + chelate acta as a tetrabasic acid, with p K a ranging from 2.5 to 10.7, depending on the ruthenium oxidation state. The absorption spectra and oxidation potentials are consequently sensitive to solution pH and to solvent. The proton-coupled oxidative electron-transfer reactions of the complexes afford stable higher oxidation states such as Ru IV . The properties of the complexes are discussed in comparison to those of previously reported bis(tridentate ligand)ruthenium compounds.

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Chemistry, Inorganic & Nuclear
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