A TRANSIENT STUDY ON THE KETOCOUMARIN DERIVATIVES Ⅰ. THE TRANSIENT ABSORPTION SPECTRUM AND ITS ASSIGNMENT

doi:10.7517/j.issn.1674-0475.1989.02.13

Abstract

Abstract: In this work, the transient spectra of ketocoumarin derivatives have been studied by laser flash photolysis method. It was confirmed that the absorption which is centered at 410 nm in transient spectrum is assigned to the triplet state of ketocoumarin by means of the life time measurement and the comparison of characteristics in the decay curve of transient species under different atmosphere. Meanwhile, the molar absorption coefficient of triplet state, the rate constant of T-T annihilation, and the triplet quantum yield of this compound were also determined.

Key words: ketocoumarin, transient state study, laser flash photolysis T-T annihilation, Photoinitiator, photosensitizer

WU SHI-KANG, ZHANG JIAN-KE, J. P. FOUASSIER, D. BURR. A TRANSIENT STUDY ON THE KETOCOUMARIN DERIVATIVES Ⅰ. THE TRANSIENT ABSORPTION SPECTRUM AND ITS ASSIGNMENT[J]. Imaging Science and Photochemistry, 1989, 7(2): 13-20.

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A TRANSIENT STUDY ON THE KETOCOUMARIN DERIVATIVES Ⅰ. THE TRANSIENT ABSORPTION SPECTRUM AND ITS ASSIGNMENT

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