Strong dual-state emission of unsymmetrical and symmetrical thiazolothiazole-bridged imidazolium salts  

作　　者：Puhui Xie Ying Zhou Xiaochuan Li Xiaojing Liu Lijie Liu Zhanqi Cao Jianji Wang Xin Zheng 

机构地区：[1]College of Sciences,Henan Agricultural University,Zhengzhou 450002,China [2]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450003,China [3]Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals,Key Laboratory of Green Chemical Media and Reactions,Ministry of Education,School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China

出　　处：《Chinese Chemical Letters》2023年第3期415-418,共4页中国化学快报（英文版）

基　　金：National Natural Science Foundation of China(Nos.U20041101,21772034,U1704251);the Top-notch Personnel Fund of Henan Agricultural University(No.30500418)for financial support。

摘　　要：A novel thiazolothiazole-bridged imidazole derivative(1) was found to exhibit blue fluorescence in gaseous state or in methanol and yellow fluorescence in solid state. The N-alkylation of imidazole subunit(s) in 1 using n-propyl iodide generated unsymmetrically or symmetrically alkylated thiazolothiazolebridged imidazolium salts with good water solubility and remarkably strong emission in solution. Furthermore, the replacement of iodide counter-anion by triflate or bis(trifluoromethane sulfonyl)imide achieved remarkably strong emission in solid state and in solution as well as good water solubility. The strong fluorescence of dicationic salts with triflate and NTf_(2)^(-)counter-anions in solid state can be ascribed to their twisted and rigid structures induced by interionic C-H···F hydrogen bonding.

关 键 词：Dual-state fluorescence Unsymmetrical TTz-bridged imidazolium Water solubility N-Alkylation of imidazole Twisted and rigid structures 

分 类 号：O626[理学—有机化学] O641.3[理学—化学]