文摘
A dinuclear cobalt complex [Co<sub>2sub>(OH)L<sup>1sup>](ClO<sub>4sub>)<sub>3sub> (1, L<sup>1sup>=N[(CH<sub>2sub>)<sub>2sub>NHCH<sub>2sub>(m-C<sub>6sub>H<sub>4sub>)CH<sub>2sub>NH(CH<sub>2sub>)<sub>2sub>]<sub>3sub>N) displays high selectivity and efficiency for the photocatalytic reduction of CO<sub>2sub> to CO in CH<sub>3sub>CN/H<sub>2sub>O (v/v=4:1) under a 450 nm LED light irradiation, with a light intensity of 100 mW cm<sup>−2sup>. The selectivity reaches as high as 98 %, and the turnover numbers (TON) and turnover frequencies (TOF) reach as high as 16896 and 0.47 s<sup>−1sup>, respectively, with the calculated quantum yield of 0.04 %. Such high activity can be attributed to the synergistic catalysis effect between two Co<sup>IIsup> ions within 1, which is strongly supported by the results of control experiments and DFT calculations.
