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<p>A coumarin based fluorescent probe&#xa0;(E)-N'-((7-hydroxy-2-oxo-2H-chromon-3-yl)methylene)furan-2-carbohydrazide (<b>CFHZ</b>) was synthesized for the detection of Fe<sup>3+</sup> and its characterizations were carried out using spectroscopic methods such as FT-IR, mass spectrometry<sup>1</sup>H-NMR, <sup>13</sup>C-NMR. The novel probe <b>CFHZ</b> showed a highly selective and sensitive “turn-off” response to Fe<sup>3+</sup> ion without any interference from other analytes. Strong fuorescence quenching phenomena of the <b>CFHZ</b> were observed in EtOH:H<sub>2</sub>O (99/1, v/v) detection system (λ<sub>em</sub> = 470&#xa0;nm) upon the additions of Fe<sup>3+</sup>. The binding stoichiometry between <b>CFHZ</b> and Fe<sup>3+</sup> was determined by Job's method, FT-IR and MALDI TOF–MS and found to be 2:1. Also, the binding constant was determined to be 1.82 × 10<sup>5</sup>&#xa0;M<sup>−1</sup> and the limits of detection for the analysis of Fe<sup>3+</sup> was measured as 25.7&#xa0;nM. Besides, experimental applications were carried out for real-time monitoring of Fe<sup>3+</sup> in water samples using developed sensor. Additionally, fluorescence imaging experiments for Fe<sup>3+</sup> detection of <b>CFHZ</b> probe on test papers were successfully performed.</p>

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A ″On–Off″ Fluorescent Sensor Based on Coumarin-Furoic Hydrazide for Recognition of Fe3+: Drinking Water, Test Strip Applications and DFT Calculations

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  • 发表日期：

    2025年2月26日

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  • Abdurrahman Karagoz,
  • Tahir Savran,
  • Ibrahim Yilmaz

摘要

A coumarin based fluorescent probe (E)-N'-((7-hydroxy-2-oxo-2H-chromon-3-yl)methylene)furan-2-carbohydrazide (CFHZ) was synthesized for the detection of Fe3+ and its characterizations were carried out using spectroscopic methods such as FT-IR, mass spectrometry1H-NMR, 13C-NMR. The novel probe CFHZ showed a highly selective and sensitive “turn-off” response to Fe3+ ion without any interference from other analytes. Strong fuorescence quenching phenomena of the CFHZ were observed in EtOH:H2O (99/1, v/v) detection system (λem = 470 nm) upon the additions of Fe3+. The binding stoichiometry between CFHZ and Fe3+ was determined by Job's method, FT-IR and MALDI TOF–MS and found to be 2:1. Also, the binding constant was determined to be 1.82 × 105 M−1 and the limits of detection for the analysis of Fe3+ was measured as 25.7 nM. Besides, experimental applications were carried out for real-time monitoring of Fe3+ in water samples using developed sensor. Additionally, fluorescence imaging experiments for Fe3+ detection of CFHZ probe on test papers were successfully performed.