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<p>A new azo-azomethine receptor, HPy-L, was synthesized via a condensation reaction of 5-(3-nitrophenyl)-azo-salicylaldehyde with 2-(hydrazonyl)pyridine in EtOH. HPy-L, with an electron-withdrawing group on the aromatic ring, acts as a highly selective and sensitive receptor for colorimetric detection of CN<sup>−</sup> ions (CAUTION: Poisonous) in Tris -CH<sub>3</sub>CN/H<sub>2</sub>O (90:10, V: V) buffer solution. The recognition of cyanide was further investigated using UV–Vis and <sup>1</sup>H NMR studies. Furthermore, the solvatochromic behavior of HPy-L was examined by analyzing its UV-Vis spectra in four pure organic solvents with different polarities, revealing a meaningful correlation. Notably, HPy-L can detect CN<sup>−</sup> over other common anions at a low detection limit of 1.18 × 10<sup>− 5</sup> M. The HPy-L was applied for qualitative and quantitative detection of cyanide in various water samples.</p>

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A Simple and Rapid Colorimetric Method for the Detection of CN⁻ ions in Semi-Aqueous Media by Using a New Azo-Azomethine Chemosensor

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Hamid Khanmohammadi,
  • Farnaz Shahosseini

摘要

A new azo-azomethine receptor, HPy-L, was synthesized via a condensation reaction of 5-(3-nitrophenyl)-azo-salicylaldehyde with 2-(hydrazonyl)pyridine in EtOH. HPy-L, with an electron-withdrawing group on the aromatic ring, acts as a highly selective and sensitive receptor for colorimetric detection of CN− ions (CAUTION: Poisonous) in Tris -CH3CN/H2O (90:10, V: V) buffer solution. The recognition of cyanide was further investigated using UV–Vis and 1H NMR studies. Furthermore, the solvatochromic behavior of HPy-L was examined by analyzing its UV-Vis spectra in four pure organic solvents with different polarities, revealing a meaningful correlation. Notably, HPy-L can detect CN− over other common anions at a low detection limit of 1.18 × 10− 5 M. The HPy-L was applied for qualitative and quantitative detection of cyanide in various water samples.