抗氧化剂防止品红甲亚胺染料光褪色的作用机制

Mechanism of Inhibiting Light Fading of Magenta Azomethine Dye by the Antioxidants

本文利用激光光解动态吸收光谱研究了氧与品红甲亚胺染料间的作用,发现染料的光褪色不仅与单重态氧有关,氧的自由基负离子也可能是引起褪色的一个重要因素.还研究了抗氧化剂对品红甲亚胺染料激发态的影响,证实前者对染料激发态有猝灭作用,据此对抗氧化剂防止品红甲亚胺染料光褪色机理作了进一步探讨.

The interaction between oxygen and magenta azomethine dye was studied by laser flash kinetic spectrophotometry. It was found that the contact charge transfer complex was formed. The light fading of magenta azomethihe dye not only relates to the singlet oxygen, but also possibly to the free radical anion of oxygen. The effect of antioxidants on the excited state of magenta azomethine dye was observed and this verifies the former can quench the excited dye. The mechanism of inhibiting the light fading of magenta azomethine dye by the antioxidants was discussed.