Enhanced Electrochemical CO<sub>2</sub> Reduction by a Series of Molecular Rhenium Catalysts Decorated with Second-Sphere Hydrogen-Bond Donors
作者:Kallol Talukdar、Sayontani Sinha Roy、Eva Amatya、Elizabeth A. Sleeper、Pierre Le Magueres、Jonah W. Jurss
DOI:10.1021/acs.inorgchem.0c00154
日期:2020.5.4
A series of rhenium(I) fac-tricarbonyl complexes containing pendent arylamine functionality in the second coordination sphere have been developed and studied as electrocatalysts for carbon dioxide (CO2) reduction. Aniline moieties were appended at the 6 position of a 2,2'-bipyridine (bpy) donor in which the primary amine was positioned at the ortho- (1-Re), meta- (2-Re), and para- (3-Re) sites of the
已经开发了一系列在第二配位球中含有侧基芳基胺官能度的f(I)fac-三羰基配合物,并将其用作还原二氧化碳(CO2)的电催化剂。苯胺部分附加在2,2'-联吡啶(bpy)供体的6位,其中伯胺位于邻位(1-Re),间位(2-Re)和对位(3 -Re)苯胺取代基的位点,以生成一族异构体。在整个系列中探索了催化剂结构与活性之间的关系,并将其与基准催化剂Re(bpy)(CO)3Cl(ReBpy)的催化性能进行了比较。催化剂1-Re,2-Re和3-Re在无水乙腈和添加三氟乙醇(TFE)作为外部质子源的情况下均优于基准催化剂。在有TFE的情况下,苯胺取代的催化剂将法拉第效率高(≥89%)的CO2转化为一氧化碳(CO),并且相对于ReBpy(72.9 s-1)具有更高的周转频率(TOF),其中2-Re具有最高的TOF系列在239 s-1时的值,是次高活性催化剂的两倍。分别观察到邻位和对位取代苯胺配合物(1-