磺酸基卟啉的电化学发光研究及应用

Cathodic Electrochemiluminescence of Meso-tetra(4-sulfophenyl) porphyrin/Potassium Peroxydisulfate System

以四(4-磺酸基苯基)卟啉(TSPP)为发光体,过硫酸钾(K_2S_2O_8)为共反应剂,构建了一个新的电化学发光(ECL)体系.在扫描范围为0^-1.5 V时,该体系出现两个阴极ECL峰,分别为TSPP的还原峰(-0.8 V)和K_2S_2O_8的还原峰(-1.2 V),亚甲基蓝能有效猝灭四(4-磺酸基苯基)卟啉的电化学发光.本文根据猝灭效率与亚甲基蓝浓度的线性关系,建立了一种测定亚甲基蓝含量的新方法.

A new electrochemiluminescence （ECL） system in aqueous solution was constructed by using meso-tetra（4-sulfophenyl） porphyrin （TSPP） as a luminophoreandpotassium peroxydisulfate （K2S2O8） as a reductive-oxidative coreactant. Upon sweeping from 0V to -1.5V, two cathodic ECL peaks were found simultaneously. One appeared at -0.8 V, which is corresponding to the reduction of TSPP, another at -1.2 V, that is attributed to the reduction of K2S2O8. And methylene blue could quench the ECL of TSPP effectively. In accordance with the linearity between quenching efficiency and the concentration of methylene blue, a method to determine methylene blue was established. The ECL mechanism was also studied through a series of experiments.