摘要
对比研究了数种溶剂中不同浓度伞形酮溶液的荧光光谱。发现其峰形和峰位不仅随溶剂而变，且随浓度而变。据此对其发光机理进行了讨论。认为在高浓度伞形酮溶液中存在着二聚现象。二聚体的形成可以借助于与溶剂间的氢键或者单体分子间的氢键作用力来实现。浓度愈高，溶剂形成氢键的能力愈强，愈有利于二聚体的形成。二聚体激发态ＮＮ＊和单体激发态Ｎ＊都是比基态Ｎ强得多的酸。
The fluorescence spectra of umbelliferone (7-hydroxycoumarin) solutions at different concentrations in various solvents are compared and studied. It is found that the peak shape and peak wavelength change not only with the solvent but also with the concentration.The luminescence processes are discussed based on the experimental resultS. To our thinking there are dimerisation phenomena in the umbelliferone solutions at high concentration. The formation of dimer NN and NN may be caused by the aid of hydrogen bonding between umbelliferone and solvent or between umbelliferone molecule themselves. The excited state NN and N. are two much stronger acid than the ground state molecule N.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1996年第2期95-99,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
北京市自然科学基金
