激基缔合物和激基复合物的形成及溶剂效应的研究

Research on the Formation of Excimer and Exciplex and the Solvent Effect

测试了ω-对联苯基多亚甲基羧酸4-[5′-对联苯基-1,3,4-(口恶)二唑基-2′-]苄酯及其模型化合物2-对甲苯基-5-联苯基-1,3,4-,(口恶)二唑在不同极性溶剂中的荧光发射光谱。它们既能形成分子间的激基缔合物又能形成分子内的激基复合物和三分子激基复合物。实验结果表明,溶剂极性的增加,有利于分子内激基复合物和三分子激基复合物的形成。

The fluorescence spectra of 4-(5/-p-biphenylyl oxadiazolyl-2’-) benzyl ω-biphenylyl polymethylene carboxylate (compounds 1-4) and their corresponding model compound 2-p-methylphenyl-5-biphenylyl-1, 3,4-oxadiazole have been determined. The-intensities of fluorescence increase as the increasing of concentration at first, then the intensities of fluorescence"decrease as the increasing of concentration. This phenomenon demonstrates that these compounds can form excimer. The experimental results show that they can form not only inter-molecular excimer but also intramolecular exciplex and triple exciplex.The fluoiesoence spectra of compounds. 1-4 in the solvents of different polarity, such as toluene, dioxane, and dichloro-methane, have been determined. The results of determination show that the intramolecular exciplex and the triple exciplex are readily formed as the increasing of the solvent polarity.