铜-四(4-三甲胺苯基)卟啉配合物吸附波研究

Polarographic Adsorptive Wave of Copper-meso-Tetra(4- trimethylammoniumphenyl) Porphyrin Complex

本文研究了铜-四(4-三甲胺苯基)卟啉配合物在汞电极上的吸附行为及其反应机理。实验证明,该配合物强烈地吸附在电极上,配合物中配位体和钢离子同时还原产生灵敏的配合物吸附波。将该吸附波用于多种样品分析,得到了较好的结果。

The sensitive adsorptive complex wave of copper-meso-tetra(4-trime-thylammoniumphenyl)porphyrin(T(4-TMAP)P) complex was studied in detial. The. peak potential of the wave is about - 1.24V(vs.SCE) in 1 mol/L KOH solution. The detection limit is 2×10-8mol/L. The peak height is linearly proportional to . the copper concentration over the range of 2×10-8mol/L to 9×10-6mol/L. In ' the presence of 5 × 10-3mol/L EDTA and 5×10-2 mol/L tartrate, at least 100. times that of common cations and anions, except more than 10 times that of Pd2 + . and SeO32-, do not interfere the determination of copper. The method was success-fully applied to the determination of trace amounts of copper in hair, waste water, liver and aluminium alloy samples.The mechanism of the polarographic wave was studied by several electrochemical methods. The composition and conditional stablity constant of Cu( Ⅱ )-T(4-TMAP)P complex were determined by 'Polarographically continuous variation method'. The results show that the ratio of Cu : T(4-TMAP)P in the complex is 1:1; the conditional stablity constant of complex β' is 7.5 ×107. The mechanism of the electrode process was verified experimentally as follows: