THE INTERACTION OF ETHYL BENZOATE AND TRIFLUOROACETIC ACID IN EXCITED STATE  

作　　者：白凤莲 樊琳 虞群 叶建平 

机构地区：[1]Institute of Chemistry, Academia Sinica, Beijing 100080, PRC [2]Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, PRC

出　　处：《Science China Chemistry》1992年第8期925-930,共6页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China and the National Laboratory for Structural Chemistry.

摘　　要：This paper is concerned with the interaction of ethyl benzoate (EBA) and trifluoroaceticacid (TFA) molecules in the excited state by measurements of steady--state and transient fluo-rescence spectra at room and low temperatures. The results show that not only the 1:1 exci-plex but also the 2:1 triplex between EBA and TFA was formed. The formation pathway ofthe triplex is that the exciplex formed at first, then by the interaction with the EBA mole-cule it transformed into triplex. But it could not be formed by the dimer of EBA by interac-tion with TFA. The dimer of EBA is confirmed in the concentrated solution. So there arefour components in EBA/TFA--concentrated solution and their fluorescence lifetimes aremeasured respectively.This paper is concerned with the interaction of ethyl benzoate (EBA) and trifluoroacetic acid (TFA) molecules in the excited state by measurements of steady--state and transient fluo- rescence spectra at room and low temperatures. The results show that not only the 1:1 exci- plex but also the 2:1 triplex between EBA and TFA was formed. The formation pathway of the triplex is that the exciplex formed at first, then by the interaction with the EBA mole- cule it transformed into triplex. But it could not be formed by the dimer of EBA by interac- tion with TFA. The dimer of EBA is confirmed in the concentrated solution. So there are four components in EBA/TFA--concentrated solution and their fluorescence lifetimes are measured respectively.

关 键 词：ethyl BENZOATE trifluoroacetic acid EXCIPLEX TRIPLEX DIMER 

分 类 号：O6[理学—化学]