title: Highly Efficient and Selective Photocatalytic CO2 Reduction by Iron and Cobalt Quaterpyridine Complexes.
abstract: 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‴-quaterpyridine) 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.
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors.forename: Zhenguo
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.|CAS Key Laboratory of Crust-Mantle and the Environment, School of Earth and Space Sciences, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Siwei
authors.initials: S
authors.lastname: Cheng
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
authors.forename: Claudio
authors.initials: C
authors.lastname: Cometto
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
authors.forename: Elodie
authors.initials: E
authors.lastname: Anxolabéhère-Mallart
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors.forename: Siu-Mui
authors.initials: SM
authors.lastname: Ng
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors.forename: Chi-Chiu
authors.initials: CC
authors.lastname: Ko
authors.affiliation: CAS Key Laboratory of Crust-Mantle and the Environment, School of Earth and Space Sciences, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Guijian
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors.forename: Lingjing
authors.initials: L
authors.lastname: Chen
authors.affiliation: Université Paris Diderot , Sorbonne Paris Cité, Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Robert
authors.affiliation: Department of Biology and Chemistry, Institute of Molecular Functional Materials, and State Key Laboratory in Marine Pollution, City University of Hong Kong , Tat Chee Avenue, Kowloon Tong, Hong Kong, China.
authors.forename: Tai-Chu
authors.initials: TC
authors.lastname: Lau