SUBSTITUTED PHTHALOCYANINE-SENSITIZED PHOTOCHEMICAL GENERATION OF SUPEROXIDE ANION-RADICAL

被引：16

作者：

ZHANG, XF ^{[1
]}

XU, HJ ^{[1
]}

CHEN, DW ^{[1
]}

机构：

[1] ACAD SINICA,INST CHEM,NATL LAB STRUCT CHEM UNSTABLE & STABLE SPECIES,BEIJING 100080,PEOPLES R CHINA

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY | 1994年 / 22卷 / 03期

基金：

中国国家自然科学基金;

关键词：

PHTHALOCYANINE; PHOTOSENSITIZATION; SUPEROXIDE RADICAL;

D O I：

10.1016/1011-1344(93)06969-A

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The quantum yield of phthalocyanine-photosensitized generation of superoxide anion radical (O-2(-)) was measured by the electron spin resonance (ESR) technique. From the redox potential data, it is concluded that O-2(-) is formed by electron transfer from the singlet excited state (not triplet or ground state) of phthalocyanines (PCs) to oxygen. Since a much larger theoretical quantum yield of O-2(-) generation (Phi(c)) than experimental (Phi(m)) was found, it is suggested that charge recombination processes between O-2(-) and PCsdivided by occur more rapidly than O-2(-) trapping by 5,5-dimethyl-1-pyrroline-1-oxide (DMPO). The results indicate that the use of DMPO as a spin trap is not an ideal method for measurement of the quantity of O-2(-) formed via photosensitization.

引用

页码：235 / 239

页数：5

共 14 条

[1] SYNTHESIS AND STRUCTURAL STUDIES OF METAL(II) 4,9,16,23-PHTHALOCYANINE TETRAAMINES [J].