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Abstract— Reactions of the triplet state of lumiflavin (3 LF) in water adjusted at pH 7.2 were reexamined by means of a Xe-flash photolysis and a laser photolysis. Measurements of the decay of 3 LF were made on solutions of LF ranging in the concentration from 4 to 61 times 10-6 mol/dm3 . A one-electron reduced and a one-electron oxidized species of lumiflavin (LF- and LF+ ) were produced in the first decay stage of 3 LF with a high efficiency (0.6 ± 0.1) in a bimolecular triplet-triplet reaction. The product radicals (LFH- and LF+ ) quench 3 LF very efficiently (3 ± 0.8 × 109 mol-1 dm3 s-1 ) compared with LF in the ground state (> 2 × 107 dm3 mol-1 ). 相似文献