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<p>A novel excited-state intramolecular proton transfer (ESIPT) fluorescence probe, 4-acetamido-2-(benzo[d]oxazol-2-yl)phenyl picolinate (MT) of benzoxazoles, was synthesized from aminosalicylic acid and <i>o</i>-aminophenol. Its structure was characterized using FT-IR spectroscopy and NMR analysis. The spectral analysis demonstrated that the probe exhibited excellent selectivity and sensitivity toward Zn<sup>2+</sup> in a DMSO:H<sub>2</sub>O = 4:6 (v/v) solution, with a detection limit of 0.09&#xa0;μmol/L. Job’s plot experiment revealed a complex ratio of 2:1 between probe and Zn<sup>2+</sup>. Finally, the external standard addition method was employed to determine the concentration of Zn<sup>2+</sup> in actual water samples.</p>

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A novel benzoxazoles fluorescent probe based on ESIPT for Zn2+ detection

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Xiang Han,
  • Wenwen Wu,
  • Shaoxuan Wang,
  • Meili Du,
  • Fuxin Chen

摘要

A novel excited-state intramolecular proton transfer (ESIPT) fluorescence probe, 4-acetamido-2-(benzo[d]oxazol-2-yl)phenyl picolinate (MT) of benzoxazoles, was synthesized from aminosalicylic acid and o-aminophenol. Its structure was characterized using FT-IR spectroscopy and NMR analysis. The spectral analysis demonstrated that the probe exhibited excellent selectivity and sensitivity toward Zn2+ in a DMSO:H2O = 4:6 (v/v) solution, with a detection limit of 0.09 μmol/L. Job’s plot experiment revealed a complex ratio of 2:1 between probe and Zn2+. Finally, the external standard addition method was employed to determine the concentration of Zn2+ in actual water samples.