溴离子存在下八乙基钴(Ⅱ)卟啉电氧化过程的电化学和光谱电化学

Electrochemical and Spectroelectrochemical Studies on the Electrooxidation of(OEP)Co(Ⅱ)in the Presence of Bromide Anions

用循环伏安和现场薄层光谱电化学方法研究了溴离子对1,2-二氯乙烷中八乙基钴(Ⅱ)卟啉[(OEP)Co(Ⅱ)]电极氧化过程的影响,结果显示溴离子可以与(OEP)Co(Ⅱ)及其三步单电子氧化产物发生1:1或2:1的配位反应.估测出各轴向配合物的稳定常数,给出了溴离子存在下(OEP)Co(Ⅱ)电极氧化还原过程的机制.

The investigation of the electrooxidation processes of(OEP)Co(Ⅱ)was carried out utilizing cyclic voltammetry(CV),electrochemical CV titration and in-situ thin-layer UV-Visible spectroelectrochemistry in 1,2-dichloroethane solution.It was indicated that Br can coordinate axially with(OEP)Co(Ⅱ)and three one-electron oxidation steps lead(OEP) Co(Ⅱ)to the formation of five-or six-dentate coodination species.The formation constants of these species were estimated.The electrooxidation mechanism of(OEP)Co(Ⅱ)in the presence of Br^-anions was given.