镉Ⅱ-meso(4-磺基苯)卟啉络合物的极谱伏安行为  

Polarographic and Voltammetric Behavior of CadmiumⅡ-meso-tetrakis (p-sulfophenyl)porphyrin Complex

作　　者：王小萍[1] 张勇[1] 潘景浩[1] 

机构地区：[1]山西大学化学系,太原030006

出　　处：《分析化学》2001年第3期290-292,共3页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学科学基金! (No .2 0 0 45 0 0 1);山西省自然科学基金! (No .9810 12 )资助项目

摘　　要：用紫外分光光度法和循环伏安法考察了镉与meso(4 磺基苯 )卟啉在强碱性溶液中形成的络合物的特性。结果表明 ,加入Cd 后该卟啉的索瑞特 (Soret)吸收带发生发红移 ,循环伏安图上出现了新的还原峰 ,峰电位为 - 1.2 0V(vs .SCE) ,络合物的络合比为 1∶1,稳定常数 β =1.19× 10 7。本文还用多种电化学技术证明了络合物的还原峰电流具有吸附特征 ;用示波极谱法二阶导数波测试了峰电流与镉离子浓度的关系 ,结果表明镉离子在 3× 10 -7～ 1× 10 -5mol/L的浓度范围内与络合物峰电流有良好的线性关系 ;并求得了电极反应的电子转移数为 2。此外本文还对络合物的电极反应机理进行了探讨。The Polarographic and voltammetric behavior of Cd*'-meso-tetrakis(p-sulfophenyl)prophyrin (TPPS 4) complex was defined and the cyclic voltammetric peak was obtained at 1.200 V (vs. SCE) in 0.3 mol/L NaoH solution. The characteristics of the peak have been examined in detail and the experimental results prove that the peak has adsorption properties. In addition to the number of electrons transferred in the reaction and the complex ratio, the stability const ant (β=1.19×10 7) was calculated. The peak current was proportional to the concentration of Cd*' over the rang 3×10 -7 ～1×10 -5 mol/L and the limit of detection was 6×10 -8 mol/L. Furthermore a possible mechanism was proposed for the reduction of the complex.

关 键 词：极谱伏安行为 meso(4-磺基苯)卟啉 镉(Ⅱ)络合物 电极反应机理 

分 类 号：O657.14[理学—分析化学]