Electro- and photocatalytic hydrogen evolution by a cobalt complex based on a tripodal iminopyridine ligand
Electro- and photocatalytic hydrogen evolution by a cobalt complex based on a tripodal iminopyridine ligand
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基于三足亚氨基吡啶配体的钴配合物的电催化和光催化析氢
DOI:
10.1016/j.poly.2014.07.031
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发表时间:
2014-10
期刊:
影响因子:
2.6
通讯作者:
Changneng Chen
中科院分区:
文献类型:
--
作者:
Xiaowei Song;Huimin Wen;Chengbing Ma;Changneng Chen
A cobalt complex based on the tripodal iminopyridine type ligand (2E)-2-N-(pyridin-2-ylmethylidene)-1-N,1-N-bis({2-[(E)-(pyridin-2-ylmethylidene)amino]phenyl})benzene-1,2-diamine (L1), namely, [CoL1](BF4)2(1a), was synthesized and characterized by FT-IR, UV–Vis spectroscopy, magnetic moment and elemental analysis. X-ray structural study of1ashows that the complex is coordinatively saturated and contains the uncoordinated bridgehead nitrogen atom. Electrochemical studies reveal that the complex1ahas an electrocatalytic proton reduction activity in acetonitrile, when using acetic acid as a proton source withicat/ip∼ 3.3. Therefore we estimate that the complex1acould give the highest TOF of 2.3 s−1for the reduction of proton to hydrogen. Furthermore, under visible-light irradiation, an optimized H2evolution system containing1a(0.1 mM), [Ir(ppy)2(bpy)](PF6) (0.1 mM), and 10 vol% TEA in CH3CN–H2O (1/1, v/v) mixed solvents at pH 10 gives a highest turnover number of 34. For comparison, an electron-withdrawing ester group (CO2CH2CH3) is introduced into the pyridine moiety of the ligand as inL2, however, which leads to its corresponding cobalt complex2aless active than the complex1afor electro- and photocatalytic H2evolution. Additionally, the control experiment establishes that the isostructural zinc complex [ZnL1](BF4)2(1b) is ineffective for H2generation.
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