Studies on the Mechanism of the Photofading of Magenta Azomethine Dye

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (2): 204.

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Studies on the Mechanism of the Photofading of Magenta Azomethine Dye

YANG Xiao-Nan, SHI Jun-Ying

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

Abstract

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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YANG Xiao-Nan, SHI Jun-Ying. Studies on the Mechanism of the Photofading of Magenta Azomethine Dye[J]. Chem. J. Chinese Universities, 1993, 14(2): 204.

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Studies on the Mechanism of the Photofading of Magenta Azomethine Dye

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