Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (3): 369-374.doi: 10.1007/s40242-018-7426-5

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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

MI Zhiming, CHEN Yao, CHEN Xiaodong, YAN Liuqing, GU Qiang, ZHANG Hanqi, CHEN Chunhai, ZHANG Yumin   

  1. College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2017-12-25 Revised:2018-03-06 Online:2018-06-01 Published:2018-03-26
  • Contact: ZHANG Yumin E-mail:zhang_ym@jlu.edu.cn

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.

Key words: Fluorescent probe, Imidazole, Ag+ ion, Microwave irradiation