期刊
ACS SENSORS
卷 3, 期 5, 页码 920-928出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.7b00820
关键词
aggregation-induced emission; excited-state intramolecular proton transfer; restricted intramolecular rotation; physiological pH; ratiometric fluorescent chemosensor
资金
- National Natural Science Foundation of China [21501150, 51502079, 21371155, 21671174, 21575034]
- Funding of Henan Key Laboratory of Cereal Resource Transformation and Utilization [PL2017006]
- Fundamental Research Funds for the Henan Provincial Colleges and Universities [2015QNJHO9]
- Science Foundation of Henan University of Technology [2015BS004]
- Research Grants Council of Hong Kong [16301614, 16305015, N_HKUST604/14]
- Innovation and Technology Commission [ITC-CNERC14SC01]
In this work, a benzothiazole-based aggregation-induced emission luminogen (AIEgen) of 2-(5-(4-carboxypheny1)-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.
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