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The effect of pH on the relative distribution of pyridoxal structures in aqueous solution was examined by fluorescence spectroscopy. The hemiacetal structure, which is the predominant species at neutral pH, exhibits a symmetrical emission band at 378 mµ and is characterized by a quantum yield of 0.08. Luminescence studies at low temperature (77° K) have permitted the analysis of the phosphorescence properties of pyridoxal. The long lived emission of pyridoxal (phosphorescence lifetime, 1.1 sec) originates in a triplet state (π → π* transition) and shows a structureless phosphorescence band (λmax at 420 mµ). An energy level diagram for pyridoxal is proposed, and the possible role of pyridoxal as a sensitizer in photobiological processes is discussed.
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Wampler et al. (1969) studied this question.
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