Study on the Fluorescence Spectra of 7-Hydroxyquinoline in Dimethyl Sulfoxide Solution
GUO Yang-xue1, LI Xiang-ping1, LIU Gui-qin2, ZHENG Jia-jin1, LIU Jing-jiang3, ZHANG Gui-lan1*, TANG Guo-qing1, CHEN Wen-ju1
1. Institute of Modern Optics, Nankai University, Key Laboratory of Opto-Electronics Information Technical Ｓcience, EMC, Tianjin 300071, China 2. College of Life Science，Nankai University, Tianjin 300071, China 3. College of Chemistry, Nankai University, Tianjin 300071, China
Abstract：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.
Key words：7-hydroxyquinoline (7-HQ);Excited-state proton transfer (ESPT);Absorption spectra;Fluorescence spectra
郭阳雪1，李向平1，刘桂琴2，郑加金1，刘靖疆3， 张桂兰1*，汤国庆1，陈文驹1 . 7-羟基喹啉在二甲基亚砜中的荧光光谱[J]. 光谱学与光谱分析, 2005, 25(12): 2016-2019.
GUO Yang-xue1, LI Xiang-ping1, LIU Gui-qin2, ZHENG Jia-jin1, LIU Jing-jiang3, ZHANG Gui-lan1*, TANG Guo-qing1, CHEN Wen-ju1 . Study on the Fluorescence Spectra of 7-Hydroxyquinoline in Dimethyl Sulfoxide Solution. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(12): 2016-2019.
