维生素K_3电化学反应机理的紫外光谱电化学研究  

Study on the Electrochemical Reaction Mechanism of Vitamin K_3 by UV-Spctroelectrochemistry

作　　者：朱世民[1] 马永钧[1] 

机构地区：[1]南京大学化学系,南京210093

出　　处：《分析化学》1998年第2期184-187,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助课题

摘　　要：用薄层池循环伏安法和现场薄层池紫外光谱电化学法研究了维生素Ｋ３（ＶＫ３）在铂电极上的电化学反应机理。薄层池循环伏安实验结果表明：ＶＫ３的电化学反应为二１ｅ准可逆过程。现场薄层池紫外光谱电化学的实验结果和Ｎｅｒｎｓｔ图解分析表明：电解还原反应的最后产物为２－甲基－１，４－萘酚。该反应偶合有前行化学反应；还原产物经电解氧化的产物为２－甲基－１，４－萘醌，该反应没有偶合化学反应。电化学反应过程中有醌－氢醌中间体存在。据此提出了相应的电化学反应机理。The electrochemical reaction mechanism of vitamin K, on platinum electrode has been studied by thin layer cell cyclic voltammetry. and in situ ultraviolet spectroelec- trochemistry. The experimental results of thin layer cell cyclic voltammetry showed that the electrochemical reaction of vitamin K3 was a quasi reversible process with two step one elec- tron transfer. The experimental results of in situ ultraviolet spectroelectrochemistry and Nernst plot analysis expressed that the final product of reductive reaction was 2-methyl-1,4- naphthol and the reaction was coupled with a preceeding chemical reaction1 the oxidative product of 2-mthyl-1, 4-naphthol was 2-methyl-1, 4-naphthoquinone and the reaction was not coupled with chemical reaction. There are quinone-hydroquinone intermediate existing in the electrochemical reaction process. According to the above results the electrochemical reaction mechanism of VK3 was suggested.

关 键 词：维生素K3 ILCV UVSEC 铂电极 电化学反应 

分 类 号：Q568.02[生物学—生物化学]