乙酸溶液荧光猝灭的机理研究

摘要

从理论上对紫外光激励乙酸产生荧光及荧光猝灭机理分别进行了分析研究.结果表明,乙酸溶液在253.7nm紫外光照射下可以发出明显的荧光,而且随着溶液浓度的变化产生了荧光猝灭的现象.分析认为,荧光猝灭的主要原因是动态猝灭过程--由最低激发单重态(n,π*)转入三重态(π,π*)所致,并对淬灭常数进行了计算.研究乙酸本体荧光特性及荧光猝灭机理可为其作为猝灭剂、溶剂、催化剂和食品添加剂时其它分子荧光光谱的研究提供参考.%Analyses of the mechanisms of acetic acid emitting fluorescence and fluorescence quenching have been made in theory. The results indicate that acetic acid solutions can emit visible fluorescence when induced by 253.7nm UV light, and fluorescence quenching occurs along with the alteration of solution concentration. It is thought that fluorescence dynamic quenching process could take into account the intersystem transition of (n,π*) to (π,π*), and the quenching constant is calculated in this paper. Investigation on the native fluorescence spectrum and its characteristics will contribute to the study of other molecules fluorescence spectra when acetic acid serves as solute, hydrolysis catalyst and food additive.