fac-[Re(dmbipy)(CO)3] and [Re(dmbipy)(CO)3}2]. Further reduction gives rise to fac-[Re(dmbipy˙–)(CO)3], which is the final product. Cathodic reduction of [Re(dmbipy)(CO)3Cl] in the presence of CO2 and absence of water leads to direct attack of CO2 on fac-[Re(dmbipy˙–)(CO)3Cl] to give [Re(dmbipy)(CO)3(CO2H)]E, which can undergo further reduction to give [Re(dmbipy˙–)(CO)2(CO2H)]. By contrast, in the presence of
根据羰基联
吡啶的derivatives在
乙腈溶液中的碳阴极处的电
化学还原反应,表明CO 2的还原反应可通过不同的途径进行,具体取决于系统中
水的浓度。在没有
水和CO 2的情况下,还原FAc- [Re(dmbipy)(CO)3 Cl](dmbipy =
4,4'-二甲基-2,2'-联吡啶)首先导致FAc- [Re(dmbipy) ˙ - )(CO)3 CL]随后的Cl消除-将得到的五坐标物种的部分二聚化,得到两个FAC - [重(dmbipy)(CO)3 ]和[的Re(dmbipy)( CO)3 } 2]。进一步还原产生最终产物FAc- [Re(dmbipy˙ –)(CO)3 ]。在存在CO 2和不存在
水的情况下[Re(dmbipy)(CO)3 Cl]的阴极还原会导致CO 2对FAc- [Re(dmbipy˙ -)(CO)3 Cl]的直接攻击。Re(dmbipy)(CO)3(CO 2 H)]