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An “AIE + ESIPT” mechanism-based benzothiazole-derived fluorescent probe for the detection of Hg2+ and its applications

Yanru Huang,Ying Li,Yang Li,Keli Zhong,Lijun Tang

Mercury ion (Hg2+) contamination is very hazardous and harmful to the natural environment and human health. The development of small molecule fluorescent probes for the rapid detection of Hg2+ is of great significance. In the present work, an “AIE + ESIPT” mechanism-based benzothiazole derived fluorescent probe was applied to Hg2+ detection and displayed excellent selectivity, good anti-interference ability, low detection limit (2.85 × 10−9 M), and a large Stokes shift (170 nm) in the DMF/H2O mixture solution with fw = 60% H2O volume fraction. The fluorescence response mechanism, involving the desulfurization reaction of O-(2-(benzo[d]thiazol-2-yl)-6-formyl-4-methylphenyl)dimethylcarbamothioate (probe L) with Hg2+ to release the “AIE + ESIPT” fluorophore, was well established based on the UV-vis, 1H NMR, and HRMS spectral analyses. The practical application evaluation indicates that probe L could be used to precisely determine Hg2+ in live cell imaging, natural water, and seafood samples.