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DETECTION OF THE EXCITED SINGLET STATE OF A DEPROTONATED, REDUCED FLAVIN

Abstract— The excited singlet state of a deprotonated, reduced flavin [1, 5‐dihydro‐N(3)‐carboxymethyllumiflavin] in aqueous solution at pH 8 has been detected by laser flash photolysis. The broad absorption band maximized at ∼ 490 nm (ε= 9.9 × 103M‐1 cm‐1). The lifetime of the transient was found to be 100 ± 15 ps. The lifetime was not affected by the presence of pyrimidine dimers, which would be monomerized under these conditions. A longer‐lived transient, tentatively identified as the solvated electron, was also detected. The neutral reduced flavin did not give a detectable transient.