Journal
JOURNAL OF FLUORESCENCE
Volume 31, Issue 3, Pages 755-761Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-021-02702-7
Keywords
Synthesis; SO2 derivatives; Cyanine; Intramolecular charge transfer (ICT)
Funding
- Open Fund of Key Laboratory of Road Structure and Material of Ministry of Transport [kfj170301]
- Hunan Provincial Natural Science Foundation of China [2019JJ40295]
- Changsha University of Science and Technology Postgraduate Research and Innovation Project [CX2019SS31]
- Key Project of Hunan Provincial Education Department of China [17A002]
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A water-soluble fluorescent probe ABI was successfully synthesized for the detection of SO2 derivatives, showing good selectivity, high sensitivity (detection limit LOD=14.9 nM), and fast reaction rate.
SO2 and its derivatives are widely present in the environment and living organisms, endangering the environment and human health. Therefore, it is of great significance for the effective detection of sulfur dioxide (SO2) and its hydrated derivatives (HSO3- /SO32-). In this study, based on the mechanism of intramolecular charge transfer (ICT), a water-soluble colorimetric fluorescent probe (E)-2-(4-acetamidostyryl)-3-(5-carboxypentyl)-1, 1-dimethyl-1H-benzo[e]indol-3-ium (ABI) for the detection of SO2 derivatives was successfully synthesized from p-acetaminobenzaldehyde by connecting the benzo[e]indoles cationic fluorophore containing highly activated methyl via C=C double bond, and the ABI structure was characterized by HRMS and H-1 NMR, (13) C NMR. Studies have shown that the ABI probe has some advantages such as good selectivity for SO2 derivatives, high sensitivity (detection limit LOD=14.9 nM), and fast reaction rate. After adding HSO3-, the color of the probe solution changed from light yellow to colorless within 10 s, which provides a simple way to identify bisulfite with the naked eye. Studies on the effect of pH on the fluorescence performance of ABI showed that fluorescence performance of ABI was stable in the range of pH (7.0-10.26). Therefore, ABI is expected to become an effective tool for detecting SO2 derivatives in cells and organisms in the future.Graphical Abstract
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