抗坏血酸存在下六氮杂铜配合物修饰金电极对多巴胺的分析测定

摘要

The hexaaza macrocyclic copper(II) complex modified gold electrode(Cu(II)L-TCA/Au) was prepared. Cyclic voltammetry (CV) and Scanning electrochemical microscopy (SECM) were used to determine the electrochemical properties of the film. The modified electrode was an effective mediator for the electrocatalytic oxidation of the dopamine and the modification allowed dopamine to be determined in the presence of ascorbic acid in the range from 1 to 5mmol/L in pH 7.6 Tris-HCl buffer solution. The detection limit(S/N=3) obtained by differential pulse voltammetry was 1.8×10-8 mol/L.%利用自组装的方法制备了一种新型六氮杂铜配合物修饰的金电极.采用循环伏安法和电化学隧道扫描显微镜对该电极进行了表征.计算了该电极电子转移系数为0.42,标准速率常数为38S-1.该电极可以有效地催化氧化多巴胺,当抗坏血酸浓度为1～5mmol/L时,可用于多巴胺的分析测定,检测限低至1.8×10-8mol/L.