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자료유형
학술저널
저자정보
Karpkird, Thitinun Monhaphol (Functional Compound Special Research Unit, Department of Chemistry, Faculty of Science, Kasetsart University) Wanichweacharungruang, Supason (Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University) Albinsson, Bo (Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제10호
발행연도
2009.1
수록면
1,455 - 1,460 (6page)

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The photophysical properties of five methoxy-substituted 2-ethylhexylcinnamates were studied with experimental and theoretical methods. It was found that the fluorescence quantum yields varied strongly with the substitution pattern of the phenyl ring. A methoxy substitution at the meta position gave strong fluorescence, whereas the para substituted compounds were strongly quenched. This observation could be correlated to corresponding changes in the UV absorption spectra; the two lowest ${\pi}{\pi}^*$ states were split for the meta-methoxy substituted cinnamate but almost degenerate for the para compound. Semi-empirical quantum mechanical calculations confirmed both the observed state order and the difference in the experimentally determined activation energies for non-radiative decay. This "meta-effect" was also preserved in the trimethoxy-substituted compounds, 2-ethylhexyl-2,4,5- and 2,4,6-trimethoxycinnamate, resulting in strong fluorescence and relatively high barrier for non-radiative decay in the former and weak fluorescence and relatively low barrier for non-radiative decay in the latter. The obtained information shows how the performance of the commercial sunscreen agent, 2-ethylhexyl-para-methoxycinnamate (OMC) might be improved.

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