Dithiolato-Bridged Nickel(II) Salicylcysteamine Complexes as Robust Proton Reduction Electrocatalysts: Cyclic Voltammetry and Computational Studies
作者:Hui Min Tang、Wai Yip Fan
DOI:10.1021/acs.inorgchem.1c02524
日期:2021.12.6
A series of Schiff-base nickel(II) complexes were prepared from the reaction of nickel(II) acetate with N-salicylcysteamine [HO-C6H4-CH═N(CH2)2SH] ligands. These complexes were analyzed to be dimeric nickel complexes containing two bridging thiolato ligands. Using cyclic voltammetry, they were found to be efficient homogeneous proton reduction electrocatalysts when acetic acid was used as the proton
通过乙酸镍(II)与N-水杨基半胱胺[HO-C 6 H 4 -CH=N(CH 2 ) 2 SH]配体的反应制备了一系列席夫碱镍(II)配合物。这些配合物被分析为含有两个桥接硫醇基配体的二聚镍配合物。使用循环伏安法,发现当乙酸用作乙腈中的质子源时,它们是有效的均相质子还原电催化剂。在镍络合物的电化学还原时触发催化。特别是,速率常数 ( k obs ) 在 10 4 s –1范围内当使用含氯或溴的镍配合物时,可实现 0.5-0.6 V 的中等过电位。结合实验数据,密度泛函理论计算为 ECEC 机制提供了支持,第一个电化学还原步骤对速率确定步骤有显着贡献。