A STUDY ON THE PHOTOSTABILIZING MECHANISM OF FLUORO-CONTAINING β-DIKETONE IN PROTONIC SOLVENT

doi:10.7517/j.issn.1674-0475.1992.03.222

Abstract

Abstract: The destruction of intramolecular hydrogen bond, hemiacetal formation and their kinetics for fluoro-containing β-diketone compounds in protonic solution have been studied by absorption and ¹H NMR spectroscopy. The processes of photo-irradiation which induces the hemiacetal going back to the original intramolecular hydrogen bond structure and the hemiacetal formation for the system after irradiation in the dark have also been investigated. Although the reason of hemiacetal destruction by irradiation is not clear yet, this kind of β-diketone with -CF₃ group which will return to intramolecular hydrogen bond under irradiation can be used as photostabilizer in the protonic solvents. The photostability of these compounds has been confirmed in this work.

Key words: Fluoro-containing β-diketone, Intramolecular, Hydrogen bond, Hemiacetal, photostabilizer, UV-absorber

MOU YING, WU SHI-KANG. A STUDY ON THE PHOTOSTABILIZING MECHANISM OF FLUORO-CONTAINING β-DIKETONE IN PROTONIC SOLVENT[J]. Imaging Science and Photochemistry, 1992, 10(3): 222-229.

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A STUDY ON THE PHOTOSTABILIZING MECHANISM OF FLUORO-CONTAINING β-DIKETONE IN PROTONIC SOLVENT

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