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<p>An efficient probe (E)-2-(benzo[d]thiazol-2-yl)-3-(9-ethyl-9&#xa0;H-carbazol-3-yl)acrylonitrile (<b>CZ-BTZ)</b> for selective fluorescence “turn-on” response with cyanide (CN<sup>−</sup>) ion sensor was developed by simple Knoevenagel condensation of 9-ethyl-9&#xa0;H carbazole-3-carbaldehyde with 2-(benzo[d]thiazol-2-yl) acetonitrile. The sensing ability of probe <b>CZ-BTZ</b> was tested with different inorganic anions through spectrophotometric and spectrofluorimetric methods. The UV-vis and fluorescence spectral studies show the formation of a new adduct between <b>CZ-BTZ</b> and CN<sup>−</sup> by appearing with a new absorbance band at 350&#xa0;nm and “turn-on” fluorescence at 535&#xa0;nm in CH<sub>3</sub>CN: H<sub>2</sub>O (8:2, v/v, pH 7.2). The absorbance and fluorescence study reveals the formation of 1:1 (<b>CZ-BTZ: CN</b><sup><b>−</b></sup>) stoichiometry adducts with an estimated association constant of 2.04 × 10<sup>5</sup> M<sup>−1</sup>. The probe <b>CZ-BTZ</b> could detect CN<sup>−</sup> down to 4.19 nM without much interference, much lower than the WHO limit (1.9 µM) in drinking water. The sensing mechanism of <b>CZ-BTZ</b> with CN<sup>−</sup> ions was studied using FTIR, ESI mass analysis, and DFT calculation. Further, the probe was applied to analyse CN<sup>−</sup> ions’ real-time food sample analysis.</p>

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A Carbazole Acrylonitrile Substituted Turn-On Fluorescence Chemosensors for Cyanide Ion and its Application to Real Sample Analysis

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Jayapriya Sengottaiyan,
  • Parvathi Kalyanasundaram,
  • Franklin Ebenazer Anbaison,
  • Sampathkumar Natarajan,
  • Jegathalaprathaban Rajesh,
  • Gurusamy Rajagopal

摘要

An efficient probe (E)-2-(benzo[d]thiazol-2-yl)-3-(9-ethyl-9 H-carbazol-3-yl)acrylonitrile (CZ-BTZ) for selective fluorescence “turn-on” response with cyanide (CN−) ion sensor was developed by simple Knoevenagel condensation of 9-ethyl-9 H carbazole-3-carbaldehyde with 2-(benzo[d]thiazol-2-yl) acetonitrile. The sensing ability of probe CZ-BTZ was tested with different inorganic anions through spectrophotometric and spectrofluorimetric methods. The UV-vis and fluorescence spectral studies show the formation of a new adduct between CZ-BTZ and CN− by appearing with a new absorbance band at 350 nm and “turn-on” fluorescence at 535 nm in CH3CN: H2O (8:2, v/v, pH 7.2). The absorbance and fluorescence study reveals the formation of 1:1 (CZ-BTZ: CN−) stoichiometry adducts with an estimated association constant of 2.04 × 105 M−1. The probe CZ-BTZ could detect CN− down to 4.19 nM without much interference, much lower than the WHO limit (1.9 µM) in drinking water. The sensing mechanism of CZ-BTZ with CN− ions was studied using FTIR, ESI mass analysis, and DFT calculation. Further, the probe was applied to analyse CN− ions’ real-time food sample analysis.