微环境对长链香豆素酯光化学和光物理过程的影响

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

疏水作用在胶束、膜的形成以及生命过程中起着重要的作用．疏水作用可促使长链分子相互簇集，造成局部浓度效应和分子的有序排列［１～３］，疏水作用对光化学和光物理过程的影响是一种微环境效应．本文合成了十六酸和十八酸－４－甲基－７－羟基香豆素酯，研究了它们在有...

The photochemical reactions and photophysics of long chain coumarin esters have been investigated. In dioxane water(DX H 2O) 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 HT dimer 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.