同分异构体对形成激基复合物的影响

引言激基复合物在光化反应中起十分重要的作用。因此,对激基复合物的形成、分解、荧光发射等过程进行深入研究,对推动光化学和光物理过程的发展有很大意义。本文作者曾用稳态荧光光谱仪研究过二苯基乙烯的顺反异构体与2,6-苯二甲酸二甲酯形成激基复合物的差别。已经证明异构体对形成激基复合物是有影响的。因此本文用毫微秒荧光光谱仪测定了它的荧光衰减过程,实验结果说明稳态荧光与动态荧光衰减过程结合,能增加对光物理过程的深入了解。

THE EFFECT OF ISOMERS ON THE FORMATION OF EXCIPLEX

In this paper, the interactions between acenaphthene (AC) and 1,4-dicyano- benzene(p-DCB) and between AC and 1, 3-dicyanobenzene(m-DCB) were studied. The results show that both systems can form exciplex but the peak positions of the two exciplex are different. For AC-pDCB, the peak position of exciplex is si- tuated at 420-425 nm but for AC-mDCB, it is around 410-415 nm. These facts indicate that the interaction between AC-pDCB is stronger than AC-mDCB. On the other hand, fluorescence quenching of acenaphthene by DCB are deviated from Stern-Volmer rule at higher concentrations of DCB. This phenomenon can be explained by the principle of sphere of action. Radius of action sphere are 1.4 nm and 1.2 nm respectively for AC-pDCB and AC-mDCB. Fluorescence decays of AC at different concentrations of pDCB or mDCB were also measured. Single exponential decay formula is obeyed for all of the measurements. From the experimental data of fluorescence decay, k_3/k_4 of both systems were calculated.