REACTIVE INTERMEDIATES IN LASER PHOTOLYSIS OF GUANOSINE

被引：39

作者：

JIAN, L

WANG, WF

ZHENG, ZD

YAO, SD

ZHANG, JS

LIN, NY

机构：

[1] Shanghai Institute of Nuclear Research, Academia Sinica, Shanghai, 201800, P.R.

来源：

RESEARCH ON CHEMICAL INTERMEDIATES | 1991年 / 15卷 / 03期

关键词：

D O I：

10.1163/156856791X00390

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The photochemical reactions of aqueous solution guanosine with acetone as photosensitizer have been investigated by laser flash photolysis. From detailed kinetic analysis, the reaction mechanism has been derived: dehydrogenated guanosine radical G(-H). and triplet guanosine 3G* were produced via electron transfer and triplet-triplet energy transfer respectively. The half-life time of 3G* has been determined to be 7.4-mu-s, and the quenching rate constant of Mn2+ on it was obtained to be 1.9 x 10(8) M-1s-1. Based on pH titration, the pKa value of 3G* was also obtained to be 8.7.

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页码：293 / 301

页数：9

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