Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 694, Issue 17, Pages 2814-2819Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2009.04.041
Keywords
Cobaloxime; Heterobinuclear complex; Hydrogen production; Photocatalysis; Ruthenium photosensitizer
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Funding
- National Natural Science Foundation China [20633020]
- National Basic Research Program of China [2009CB220009]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0711]
- Swedish Energy Agency
- Swedish Research Council
- K & A Wallenberg Foundation
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Two heterobinuclear complexes [(bpy)(2)Ru(bpy-4-CH3,4'-CONH(4-py)Co(dmgBF(2))(2)(OH2)](PF6)(2) (1, dmgBF(2) = (difluoroboryl) dimethylglyoximato) and [(bpy)(2)Ru(bpy-4-CH3,4'-CONHCH2(4-py)Co(dmgBF(2))(2)(OH2)](PF6)(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 Et3N and [Et3NH][BF4] 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.
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