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| Design, Synthesis and Performance of Fluorescent Probe for Detection of Hg2+ With 1,3-Oxathiolane as Receptor |
| LIANG Qing-xiang1, ZHOU Wu1, WU Ai-bin1, 2, 3*, SHU Wen-ming1, 3, YU Wei-chu1, 2* |
1. Department of Chemistry, School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China
2. Unconventional Oil and Gas Collaborative Innovation Center, Yangtze University, Jingzhou 434023, China
3. Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields, Jingzhou 434023, China
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Abstract Hg2+ is one of the most toxic heavy metal ions, which can cause air, soil, and water pollution, seriously damaging human health. Therefore, developing effective analytical methods to detect Hg2+ in environmental systems is particularly important. Fluorescent probes have been widely used to detect Hg2+ due to their advantages, such as high sensitivity, good selectivity, fast response time, and real-time online detection. In this paper, a novel “turn-on” fluorescent probe (2-(pyren-1-yl)-1,3-oxathiolane, POX) with 1,3-oxathiolane as receptor was designed and synthesized based on Hg2+-promoted deprotection reaction of thioacetal, and1H NMR, 13C NMR, and HRMS characterized its structure. The selectivity, competitiveness, concentration titration, pH titration, time dependence, the limit of detection, and recognition mechanism of POX for the detection of Hg2+ in CH3CH2OH/H2O solution were investigated. The results showed that POX could quickly recognize Hg2+ in a wide pH range and exhibited high selectivity and sensitivity. Adding Hg2+ to the solution of POX resulted in a clear fluorescence emission peak at 386 nm, indicating that POX showed a remarkable “turn-on” fluorescence for Hg2+, and its recognition process was almost unaffected by other metal ions. Fluorescence titration experiments indicated that POX had a good linear response (R2=0.999 4) in the range of Hg2+ from 0~ 6.5 μmol·L-1, with a detection limit of 0.168 μmol·L-1. The RSD of POX for detecting Hg2+ in actual water samples was less than 2.92%. The simple synthesis, easy availability of raw materials, and wide pH applicability of POX suggested that itcould be used as a potential tool for the qualitative and quantitative detection of Hg2+ in the environment.
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Received: 2023-04-13
Accepted: 2023-11-06
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Corresponding Authors:
WU Ai-bin, YU Wei-chu
E-mail: abwu@yangtzeu.edu.cn；yuweichu@126.com
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