The spectra properties of 2-(2'-hydroxyphenyl)benzothiazole in different solvents

• Published in: Guang pu xue yu guang pu fen xi Vol. 28; no. 5; p. 970
• Main Authors: Zheng, Jia-Jin, Zhang, Gui-Lan, Wu, Feng, Ma, Li-Na, Chen, Wen-Ju
• Format: Journal Article
• Language: Chinese
• Published: China 01.05.2008
• ISSN: 1000-0593

2-(2 -hydroxyphenyl)benzothiazole (HBT) is a typical compound with excited--state intramolecular proton transfer (ESIPT) effect. The mechanism of the influence of the solvent polarity on the ESIPT effect of HBT was investigated by means of absorption and fluorescence spectra in different polar solvents. The absorption spectra of HBT molecule in all solvents have the similar configuration and are mainly situated in the UV region from 260 to 370 nm. The absorption peaks are located at 287 and 335 nm and have the decline trend with the increase in the solvent polarity. In addition, there is a very weak absorption band at 400 nm and it is attributable to the absorption from the keto form of HBT. Under UV excitation at 335 nm, the fluorescence spectra in all the solvents were obtained. All the fluorescence spectra exhibit dual fluorescence peaks, which are located at 385 and 512 nm respectively. The former is attributed to the emission from the HBT enol forms, named the normal fluorescence, and the latter the emis