离子液体中电生成CoL催化行为研究

Catalytic Behavior of Electrogenerated Co(?)L in Ionic Liquids

在离子液体中,研究了CoL(钴希夫碱配合物)的电化学行为,并进一步探讨了其对氯苄还原以及PhCH_2Cl与CO_2反应的催化特性.CoL在离子液体中呈现一对由扩散控制的单电子可逆氧化还原峰,通过电化学行为研究发现,其氧化还原峰电位不易随金属有机配合物的配体和离子液体阴离子的变化而变化,并求得了相应的扩散系数.同时,循环伏安图表明该体系能对PhCH_2Cl的还原起催化作用,反应经历一个ECE过程,另外,该体系还能催化PhCH_2Cl与CO_2反应,通过恒电位电解得到(PhCH_2)_2CO,说明常温常压下,CO_2可以通过CoL催化在离子液体中进行固定,得到新的有机化合物。

The electrochemical behavior of CoL （cobalt Schiff base complex） has been studied in ionic liquids. Its catalytic activity towards the reduction of PhCH2Cl and the reaction between PhCH2Cl and CO2 has also been investigated. CoL shows a diffusion controlled one-electron reversible peak couple in ionic liquids. The electrochemical behavior shows that the peak potential will not be influenced by the Schiff base ligand and the anion of the ionic liquids. CoL could catalyze the reduction of PhCH2Cl by the voltammograms. The mechanism involves a one-electron reduction and a chemical reaction followed by another one-electron reduction. And this system could also catalyze the reaction between PhCH2CI and CO2. Controlled-potential electrolysis led to （PhCH2）2CO, indicating that CO2 can be fixed in ionic liquids by the catalysis of CoL.