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Reactive Intermediates in Laser Photolysis of Guanosine1

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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 μS, and the quenching rate constant of Mn2+ on it was obtained to be 1.9 x 108 M-1s-1. Based on pH titration, the pKa value of 3G* was also obtained to be 8.7.

Affiliations: 1: Shanghai Institute of Nuclear Research Academia Sinica P.O. Box 800-204, Shanghai 201800, P.R. CHINA


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