title: Water oxidation catalyzed by a dinuclear cobalt-polypyridine complex.
abstract: The dinuclear Co complex [(TPA)Co(μ-OH)(μ-O2 )Co(TPA)](ClO4 )3 (1, TPA=tris(2-pyridylmethyl)amine) catalyzes the oxidation of water. In the presence of [Ru(bpy)3 ](2+) and S2 O8 (2-) , photoinduced oxygen evolution can be observed with a turnover frequency (TOF) of 1.4±0.1 mol(O2 ) mol(1)(-1)  s(-1) and a maximal turnover number (TON) of 58±5 mol(O2 ) mol(1)(-1) . The complex is shown to act as a molecular and homogeneous catalyst and a mechanism is proposed based on the combination of EPR data and light-driven O2 evolution kinetics.
authors.affiliation: School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062 (P. R. China); Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, 75120 Uppsala (Sweden).
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Wang
authors.forename: Edgar
authors.initials: E
authors.lastname: Mijangos
authors.forename: Sascha
authors.initials: S
authors.lastname: Ott
authors.forename: Anders
authors.initials: A
authors.lastname: Thapper
keywords: dinuclear cobalt complexes; homogeneous catalysis; photocatalysis; water oxidation