In this work, a benzothiazole-based aggregation-induced emission luminogen (AIEgen) of 2-(5-(4-carboxyphenyl)-2-hydroxyphenyl)benzothiazole (3) was designed and synthesized, which exhibited multifluorescence emissions in different dispersed or aggregated states based on tunable excited-state intramolecular proton transfer (ESIPT) and restricted intramolecular rotation (RIR) processes. 3 was successfully used as a ratiometric fluorescent chemosensor for the detection of pH, which exhibited reversible acid/base-switched yellow/cyan emission transition. More importantly, the pH jump of 3 was very precipitous from 7.0 to 8.0 with a midpoint of 7.5, which was well matched with the physiological pH. This feature makes 3 very suitable for the highly sensitive detection of pH fluctuation in biosamples and neutral water samples. 3 was also successfully used as a ratiometric fluorescence chemosensor for the detection of acidic and basic organic vapors in test papers.

中文翻译：

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基于苯并噻唑的AIEgen具有可调节的激发态分子内质子转移和受限的分子内旋转过程，可实现高度敏感的生理pH值传感

在这项工作中，设计并合成了基于苯并噻唑的2-（5-（4-羧基苯基）-2-羟基苯基）苯并噻唑（3）的聚集诱导发光致发光剂（AIEgen），其在不同的分散或聚集状态下均表现出多荧光发射基于可调谐激发态分子内质子转移（ESIPT）和受限分子内旋转（RIR）过程的分子态。3已成功用作比率pH荧光化学传感器，用于检测pH，该pH传感器显示出可逆的酸/碱转换的黄色/青色发射跃迁。更重要的是，的pH跃变3是非常陡峭从7.0至8.0的7.5的中点，将其很好地与生理pH值匹配。此功能使3非常适用于高灵敏度检测生物样品和中性水样品中的pH波动。3还成功地用作比率式荧光化学传感器，用于检测试纸中的酸性和碱性有机蒸气。