近红外吸收菁染料光氧化反应机理的研究

STUDY ON THE MECHANISM OF PHOTOOXIDATION OF NEAR-INFRARED ABSORBING CYANINE DYES

本文选择了三种分子结构相同而母核杂原子不同的近红外吸收菁染料，对它们的光谱性能特征及光氧化稳定性能进行了研究．结果表明，具有三种不同母核杂原子的菁染料，其光氧化稳定性顺序为：苯并 唑＞苯并噻唑＞苯并硒唑．通过猝灭实验给出，在三种菁染料的光氧化反应机制中，具有反应活性的单线态氧和超氧负离子同时存在，其中单线态氧是导致菁染料褪色的主要因素．

In this paper,spectrum characteristic and stability of three near-infrared cyanine dyes against photooxidation have been studied. Results showed that the stability of dyes with three kinds typical structure of heterocyclic stem against photooxidation was in such order:benzoxazole>benzothiazole>benselenazole. It was indicated through the quenching experiments that both of singlet oxygen mechanism and superoxide anion mechanism might be present in the auto-sensitized photooxidation of cyanine dyes, and photooxidation merely occurred in single oxygen mechanism.