以激基缔合物为中间体的对－N，N－二甲氨苯乙烯和蒽乙烯的光环加成反应  

The Exciplex as an Intermediate for Photocycloaddition of 9-Vinyl Anthracene and p-N,N-Dimethylamino Styrene

作　　者：高颖[1] 陆天虹[1] 

机构地区：[1]哈尔滨师范大学化学系,中国科学院长春应用化学研究所

出　　处：《高等学校化学学报》1996年第4期618-621,共4页Chemical Journal of Chinese Universities

摘　　要：研究了对－Ｎ，Ｎ－二甲氨苯乙烯和蒽乙烯生成的激基缔合物在不同极性溶剂中的荧光特性，发现其荧光发射波长随溶剂的极性增大向长波方向移动，且发现激基缔合物荧光量子产率的大小决定对－Ｎ，Ｎ－二甲氨苯乙烯和蒽乙烯的光环加成产物的产率。其中反式产物的相对产率随溶液极性增大而降低，并进一步探讨了此光环加成反应的机理。The appearence of the new fluorescence peak at about 570 nm demonstratesexciplex formation between the singlet states of 9-vinyl anthracene and p-H, M-dimethy-lamino stytene.With increasing the polarity of solvents, the red-shift of the emission wavelength occurs and the fluorescence quantum yield of the exciplex decreases.For example,thefluorescence peak is at 550 nm in totuene and at 595 nm in butanone. The fluorescence qua-tum yields in totuene and in butanone are 0. 053 and 0 respectively.Both the relative yield ofthe photocycloaddition dimer and the ratio of the relative yields of the trans and cis dimers decrease with increasing the polarity of solvents. For example,the relative yields of the dimerare 1.0 in totuene and 0.04 in butanone respectively.The ratio of the relative yields of transand cis dimers are 0.54 and 0 in totuene and butanones, respectively. In addition, the exciplex intermediate mechanism was suggested for the photocycloaddition between 9-vinyl anthracene and 9-N,N-dimethylamino styrene.

关 键 词：激基缔合物 光环加成 蒽乙烯 荧光特性 

分 类 号：O644.12[理学—物理化学]