Microenvironmental Effects on the Photochemical and Photophysical Processes of Long Chain Coumarin Esters

Abstract

Abstract: The photochemical reactions and photophysics of long chain coumarin esters have been investigated. In dioxane water(DX H₂O) solvent mixture, long chain 4-methyl-7-hydroxycoumarin hexadecanate and octadecanate form aggregates forced by the hydrophobic effect. The photochemical reactions of this two long chain coumarin esters gave exclusively anti-HTdimer in 75% and 90% yields respectively in dioxane-water(volume ratio 1:2) solvent mixture. The excimer formation and the acceleration of photochemical reaction were ascribed to the hydrophobic effect and the changes of microenvironment.

Key words: Photochemistry, Coumarin, Excimer

CLC Number:

O644

TrendMD:

DU Da-Ming, WANG Yong-Mei, MENG Ji-Ben . Microenvironmental Effects on the Photochemical and Photophysical Processes of Long Chain Coumarin Esters[J]. Chem. J. Chinese Universities, 1998, 19(10): 1611.

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Microenvironmental Effects on the Photochemical and Photophysical Processes of Long Chain Coumarin Esters

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