Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-05-01

Journal: INORGANIC CHEMISTRY COMMUNICATIONS

Included Journals: SCIE

Volume: 55

Page Number: 56-59

ISSN: 1387-7003

Key Words: Ruthenium dimer catalyst; Water oxidation; Mechanism; Kinetic study

Abstract: A new dinuclear ruthenium complex 1 (L1[Ru(bda)(2)(picoline)](2)) based on Ru-bda (H(2)bda = 2,2'-bipyridine-6,6'-dicarboxylic acid) and dipyridyl xanthene (L1 = 4,5-dipyridyl-2,7-di-tert-butyl-9,9-dimethyl xanthene) ligand was synthesized to probe the catalytic oxidation of water. An oxygen evolution experiment displays a low catalytic water oxidation activity with a first-order reaction kinetic mechanism. The result indicates that the O-O bond formation of the dinuclear catalyst 1 follows a water nucleophilic attack pathway rather than a radical coupling pathway. The most plausible interpretation is that the steric hindrance effects of the L1 and bda ligands lead to a disadvantage in forming the face-to-face configuration of the two active sites in a one dimer molecule. (C) 2015 Elsevier B.V. All rights reserved.