标题：A benzothiazole-rhodol based luminophor: ESIPT-induced AIE and an application for detecting Fe2+ ion
作者：Guan, Jianping ;Tu, Qin ;Chen, Long ;Yuan, Mao-Sen ;Wang, Jinyi
作者机构：[Guan, Jianping ;Tu, Qin ;Chen, Long ;Yuan, Mao-Sen ;Wang, Jinyi ] College of Chemistry & Pharmacy, Northwest A&F University, Yangling; Shaanxi; 71210 更多
来源：Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
摘要：Herein, we designed and synthesized a luminophor, Rh-F, which is an intergrant of rhodol and 2-hydroxy benzothiazole by introducing a benzothiazole unit onto the ortho-position of the phenolic hydroxy of rhodol. Rh-F exhibited excellent fluorescence properties such as a large Stokes shift (>180 nm) and the synergistic effect of aggregation-induced emission (AIE) and an excited state intramolecular proton transfer (ESIPT) feature. The AIE/ESIPT mechanism was thoroughly explored using X-ray single-crystal structures and photophysical determinations. Furthermore, Rh-F showed a sensitive fluorescence response to Fe2+ with low detection limits of 115.2 nM and high selectivity. Studies of its sensing mechanism indicated that the Fe2+-induced blue-green fluorescence-quenched at 525 nm originates from an irreversible Fe2+ chelate with the oxygen atom of the hydroxyl group and the N atom of the benzothiazole moiety. This blocked the ESIPT process of Rh-F which resulted in the quenching of the fluorescence sensor for Rh-F.
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