Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 30, Pages 9413-9416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b06002
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Funding
- Hong Kong University Grants Committee Area of Excellence Scheme [AoE/P-03-08]
- Shenzhen Science and Technology Research Grant [JCYJ20150601102053067]
- Universite Sorbonne Paris Cite
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The design of highly efficient and selective photocatalytic systems for CO2 reduction that are based on nonexpensive materials is a great challenge for chemists. The photocatalytic reduction of CO2 by [Co(qpy) (OH2)(2)](2+) (1) (qpy = 2,2 ' : 6 ',2 '' : 6 '',2 ''-quater-pyridine) and [Fe(qpy)(OH2)(2)](2+) (2) have been investigated. With Ru(bpy)(3)(2+) as the photosensitizer and 1,3-dimethyl-2-phenyl-2,3- dihydro-1H-benzo [d]imidazole as the sacrificial reductant in CH3CN/triethanolamine solution under visible-light excitation (blue light-emitting diode), a turnover number (TON) for CO as high as 2660 with 98% selectivity can be achieved for the cobalt catalyst. In the case of the iron catalyst, the TON was > 3000 with up to 95% selectivity. More significantly, when Ru(bpy)(3)(2+) was replaced by the organic dye sensitizer purpurin, TONs of 790 and 1365 were achieved in N,N-dimethylformamide for the cobalt and iron catalysts, respectively.
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