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Synthesis of Highly Sensitive Fluorescent Probe Based on Tetrasubstituted Imidazole and Its Application for Selective Detection of Ag+ Ion in Aqueous Media

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Abstract

A small molecule fluorescent probe, 4-[2-(4-chlorophenyl)-4,5-diphenyl-1H-imidazol-1-yl]aniline(L) for detecting Ag+ ion was gently synthesized via one-pot multi-component reaction catalyzed by H3[PW12O40] under solvent-free microwave irradiation. When the concentration of Ag+ ion changed from 0 to 8.0×10−6 mol/L in the solution of H2O/CH3OH(19:1, volume ratio), the fluorescence emission spectrum was blue-shifted and accompanied by a gradual increase in fluorescence intensity with a low detection limit of 3.0×10−11 mol/L. Moreover, UV-Vis absorption titration experiment demonstrated a 1:1 stoichiometric ratio and an association constant of (9.95±0.44)×105 L/mol between probe L and Ag+ ion, and thus their complexation mechanism was also proposed and verified. More importantly, this fluorescent probe was remarkably specific for Ag+ ion under the interference of other metal ions and exhibited a wide pH application range of 4.0―8.0. Additionally, preliminary application of this probe was also carried out and satisfactory results were shown.

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Acknowledgements

We are grateful to Dr. WANG Chunyu(Jilin University) for NMR spectra test, Dr. WEI Zhonglin(Jilin University) for MS spectra test and Dr. DAO Jungang(Jilin University) for fluorescent emission spectra test.

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Correspondence to Yumin Zhang.

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40242_2018_7426_MOESM1_ESM.pdf

Synthesis of highly sensitive fluorescent probe based on tetrasubstituted imidazole and its application for selective detection of Ag+ ion in aqueous media

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Mi, Z., Chen, Y., Chen, X. et al. Synthesis of Highly Sensitive Fluorescent Probe Based on Tetrasubstituted Imidazole and Its Application for Selective Detection of Ag+ Ion in Aqueous Media. Chem. Res. Chin. Univ. 34, 369–374 (2018). https://doi.org/10.1007/s40242-018-7426-5

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  • DOI: https://doi.org/10.1007/s40242-018-7426-5

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