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本文研究了曙红敏化NAD(P)H的模型化合物——1-苄基-1,4-二氢吡啶菸酰胺(BNAH)光还原二苯乙二酮的反应机制及光敏剂曙红的激发态行为。用三重态猝灭剂——蒽猝灭反应的结果表明,曙红的激发单重态与激发三重态都参与了敏化反应。计算了单重态与三重态反应的量子产率及它们的反应速率常数。从氧化还原电位及激发能的数据可以预计,能量转移敏化不可能发生,而受激发的曙红将电子转移至受体二苯乙二酮这一步则很可能是光敏还原反应的起始过程。
In this paper, the reaction mechanism of photodegradation of diphenyldione by 1-benzyl-1,4-dihydropyridine nicotinamide (BNAH), a model compound of eosin-sensitized NAD (P) H, Excited state behavior. The results of quenching reaction with anthraquinone, a triplet quencher, showed that both the excited singlet and the excited triplet state of eosin were involved in the sensitization reaction. The quantum yields of singlet and triplet reactions and their reaction rate constants were calculated. From the data of the redox potential and the excitation energy, it can be predicted that energy transfer sensitization can not occur, and the excited eosin transfers electrons to the acceptor diphenyldione, which is likely to be the initial process of the photo-reduction reaction .