EXCITED-STATE REACTIONS OF OXIDIZED FLAVIN DERIVATIVES |
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Authors: | Nehama Lasser Jehuda Feitelson |
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Institution: | Department of Physical Chemistry, The Hebrew University, Jerusalem, Israel |
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Abstract: | Abstract— The reactivity of flavin mononucleotide and of lumiflavin triplets was studied by flash and laser photolysis. The rate constants of the triplets with oxygen, with flavin ground-state molecules, and with Br- ions were determined. Although in solution at room temperature, the protonated flavin triplet, 3F1H+, is not formed directly from its very short lived singlet state, a transient, which we think is this triplet, results from protonation of the neutral triplet. This conclusion is based on a comparison between the neutral and the protonated triplet spectra in a low-temperature glass. It is proposed that the protonated triplet can also be formed by sensitization via the phenanthrene triplet. |
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