高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (2): 204.

• 研究论文 • 上一篇    下一篇

品红甲亚胺染料光褪色机理研究(Ⅰ)——与活性氧的反应能力

杨小南, 石俊英   

  1. 华东化工学院专用化学品研究所, 上海 200237
  • 收稿日期:1992-04-01 修回日期:1992-06-30 出版日期:1993-02-24 发布日期:1993-02-24
  • 通讯作者: 杨小南

Studies on the Mechanism of the Photofading of Magenta Azomethine Dye

YANG Xiao-Nan, SHI Jun-Ying   

  1. Research Institute of Speciality Chemicals, Bast China University of Chemical Technology, Shmgim., 200237
  • Received:1992-04-01 Revised:1992-06-30 Online:1993-02-24 Published:1993-02-24

摘要: 用紫外-可见吸收光谱和高效液相色谱研究了品红甲亚胺染料(MAD)的光褪色过程。结果表明:MAD本身不是产生活性氧(1O2·O2-.的敏化剂,而是一个良好的活性氧的受体。敏化剂亚甲基兰(MB)、孟加拉玫瑰(RB)所产生的活性氧都对MAD的褪色有贡献。用竞争动力学实验,以二苯基苯并呋喃为竞争反应的标准物质,测定了MAD与活性氧反应的总反应速率常数(k=8.50×107L/mol·s)和化学反应速率常数(kR=1.49×107L/mol·s)。结果发现猝灭过程以物理猝灭为主。RB或MB敏化MAD光氧化实验表明。1O2是导致MAD光氧化褪色的主要原因。

关键词: 品红甲亚胺染料, 光氧化, 单线态氧, 超氧离子

Abstract: In this paper, the photofading of magenta azomethine dye(MAD) were studied by HPLC, UV-Vis spectra.It was found that MADwas not a sensitizer but a good acceptor of active oxygen (1O2,O2-).The physical and chemical quenching rate constant of MADwith active oxygen was measured by HPLC, it is found that physical quenching is the chief pathway in the quenching process (KR=1.49×107 L/mol·s, KQ=7.01×107 L/mol·s) and singlet oxygen (1O2) plays a dominant role in the photofading of MADsensitized by Methylene Blue (MB) or Rose Bengal (RB),

Key words: Magenta azomethine dye, Photo-oxidation, Singlet oxygen, Superoxide anion

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