[Study on the fluorescence spectra of 7-hydroxyquinoline in dimethyl sulfoxide solution].
7-hydroxyquinoline (7-HQ) is a kind of organic molecule with excited-state proton transfer (ESPT) effect. 7-HQ in ethanol solution causes ESPT reaction under the excitation of ultraviolet light. The fluorescence spectrum of the sample exhibits two bands. In contrast, 7-HQ in dimethyl sulfoxide (DMS) solution does not cause ESPT reaction. The fluorescence spectrum of the sample exhibits a single band. But after the sample was irradiated with a strong UV light, its fluorescence spectrum also exhibits two bands. This phenomenon is reported for the first time in the present paper, and its cause is investigated through the study on the absorption spectra and fluorescence spectra of 7-HQ in ethanol, dimethyl sulfoxide and N, N-dimethyl formamide solution. The conclusion is that the change in the fluorescence spectrum of 7-HQ in DMS solution is due to the fact that 7-HQ causes ESPT reaction which results from the photodecomposition of DMS and the product of water after the solution was irradiated with strong UV light.
Institute of Modem Optics, Nankai University, Key Laboratory of Opto-Electronics Information Technical Science, EMC, Tianjin 300071, China.
Yang-Xue
YX
Guo
Xiang-Ping
XP
Li
Gui-Qin
GQ
Liu
Jia-Jin
JJ
Zheng
Jing-Jiang
JJ
Liu
Gui-Lan
GL
Zhang
Guo-Qing
GQ
Tang
Wen-Ju
WJ
Chen
D004121:Dimethyl Sulfoxide / Q000737:chemistry*; D006912:Hydroxyquinolines / Q000032:analysis* / Q000737:chemistry; D015394:Molecular Structure; D012996:Solutions; D013050:Spectrometry, Fluorescence
D006912:Hydroxyquinolines; D012996:Solutions; C547246:7-hydroxyquinoline; D004121:Dimethyl Sulfoxide