meso—四（4—磺基苯基）卟啉在汞电极预吸附与铜,锌...  

Voltammetry of Complexation of Copper(Ⅱ)and Zinc(Ⅱ) With meso-Tetrakis(4-phenylsulphonate) porphyrin Preadsorbed at a Static Mercury Drop Electrode

作　　者：逮晓燕 高小霞 

机构地区：[1]北京大学化学系 [2]北京大学化学系 北京 [3]北京首都医学院卫生系,100871 [4]北京

出　　处：《分析化学》1991年第1期755-758,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金

摘　　要：一般水溶性金属卟啉络合物要在溶液加热或有某种催化剂存在下才能形成。本文报道将乙酸缓冲液中的meso-四(4-磺基苯基)卟啉(TPPS_4)预先吸附于汞滴电极,取出电极,洗净,插入仅含Cu^(2+)的相同底液中,在单扫伏安图上就可得到Cu-TPPS_4络合物的还原峰。利用峰高可测定微量铜以及研究络合物的电化学行为。同样,在氨性底液中,吸附了卟啉的汞滴电极插入含Cd^(2+)、Zn^(2+)、Co^(2+)、Mn^(2+)等离子的溶液中,也可快速地得到相应的络合物还原峰。这是一个简便且重现性很好的形成和研究金属卟啉络合物的新方法。We report a very simple, quick and reproducible method for preparing a porphyrin adsorbed at an electrode, which is very useful in metalloporphyrin research. Water soluble meso-tetrakis(4-phenylsulphonate)porphyrin(TPPS_4)was preadsorbed at a static mercury drop electrode in an HAc-NaAc buffer solution at pH 6. 0 for 20 s. After the electrode was rinsed and inserted into a dilute solution of Cu(Ⅱ)for 30 s, a sharp reduction peak of Cu -TPPS_4 could be observed in the linear-sweep voltammogram with v=100mV/s at Ep=-0. 96 V(vs. Ag/AgCl)This peak is proved to be the reduction peak of Cu-TPPS_4, which can be used to determine micro amounts of Cu(Ⅱ)and investigate its electrochemical properties. In a similar way, other divalent cations, such as Zn(Ⅱ), Cd(Ⅱ), Co(Ⅱ)and Mn(Ⅱ), in an NH_3-NH_4Cl buffer solution(pH 8. 8)can also form corresponding complexes with TPPS_4 at the electrode and produce the reduction peaks at different potentials.

关 键 词：铜 锌 TPPS4 伏安法 汞电极 

分 类 号：O614.121[理学—无机化学]