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Indexed by:期刊论文

Date of Publication:2009-08-01

Journal:JOURNAL OF ORGANOMETALLIC CHEMISTRY

Included Journals:SCIE

Volume:694

Issue:17

Page Number:2814-2819

ISSN No.:0022-328X

Key Words:Cobaloxime; Heterobinuclear complex; Hydrogen production; Photocatalysis; Ruthenium photosensitizer

Abstract:Two heterobinuclear complexes [(bpy)(2)Ru(bpy-4-CH(3),4'-CONH(4-py)Co(dmgBF(2))(2)(OH(2))](PF(6))(2) (1, dmgBF(2) = (difluoroboryl) dimethylglyoximato) and [(bpy)(2)Ru(bpy-4-CH(3),4'-CONHCH(2)(4-py)Co(dmgBF(2))(2)(OH(2))](PF(6))(2) (2) were prepared, in which the polypyridyl ruthenium photosensitizer and the cobaloxime catalyst are connected either by a conjugated bridge (1) or by an unconjugated one (2). Complexes 1 and 2 were used as photocatalysts for hydrogen generation. Under optimal conditions, the turnover numbers (ton) for hydrogen evolution were 38 for 1 and 48 for 2 in the presence of 300 equiv of both Et(3)N and [Et(3)NH][BF(4)] in the acetone solution during an 8-h irradiation of visible light (lambda > ca. 400 nm). The complex 2 with an unconjugated bridge proved to be more efficient for photochemical hydrogen generation than the complex 1 with a conjugated bridge under the same reaction condition. (C) 2009 Elsevier B.V. All rights reserved.