Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (2): 200-208.doi: 10.1007/s40242-019-8244-0

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A New Tetrasubstituted Imidazole Based Difunctional Probe for UV-spectrophotometric and Fluorometric Detecting of Fe3+ Ion in Aqueous Solution

SHI Yanpeng, CHEN Xiaodong, MI Zhiming, ZHENG Ran, FAN Jie, GU Qiang, ZHANG Yumin   

  1. College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2018-07-30 Revised:2018-10-17 Online:2019-04-01 Published:2019-04-30
  • Contact: ZHANG Yumin E-mail:zhang_ym@jlu.edu.cn

Abstract: Two new compounds, 4-(2-bromophenyl-4,5-diphenyl-imidazol-1-yl)aniline(probe 1) and 4-[2,4,5-tris(4-bromophenyl)-1H-imidazol-1-yl]aniline(probe 2), were synthesized via a soft and high-efficiency one-pot microwave-assisted method under solvent-free conditions. Their sensing to different metal ions was detected by UV spectrophotometry and fluorescence spectrometry. Probe 2 revealed highly selective and sensitive UV and fluorescence response to Fe3+ ion. Upon the addition of Fe3+ ion, probe 2 showed obvious color change of the solution, conspicuous absorbance enhancement and relatively quick fluorescence quenching. The detection limit for Fe3+ ion was respectively calculated to be 0.72 μmol/L(fluorescent detection) and 0.48 μmol/L(UV-spectrum detection). Also, probe 2 was bound by Fe3+ ion to form a 1:1 complex. Moreover, preliminary application of probe 2 for detecting Fe3+ ion in aqueous solution was attempted, and satisfying results were obtained.

Key words: Fe3+ ion probe, Imidazole, Fluorescence quenching, Absorbance enhancement, Microwave synthesis