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Abstract <p>A novel naphthalene-based Schiff base ligand (<b>SBL</b>) was synthesized by the condensation of naphthalene-1-8-diamine with 4-dimethylaminobenzaldehyde as a colorimetric probe for the selective detection of Fe<sup>3+</sup> ions in ethanol solution. The UV-Vis spectroscopic technique was employed to study the sensing ability of the probe SBL for Fe<sup>3+</sup> ions, which was monitored in ethanol solution (pH 4). The Job’s plot confirmed a 1 : 1 molar complex formation between SBL and Fe<sup>3+</sup>. Density functional theory computations also supported the binding framework between SBL and Fe<sup>3+</sup>. The limit of detection for Fe<sup>3+</sup> is 6 × 10<sup>–6</sup> M, and the limit of quantification is 2 × 10<sup>–5</sup> M. The binding constant, evaluated using the Benesi–Hildebrand method, is 6.9 × 10<sup>4</sup> M. Cyclic voltammetry study shows that there is no change in the electrochemical structure of SBL after complex formation with Fe<sup>3+</sup>.</p>

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A Colorimetric Detection Probe for Iron(III) with a Naphthalene-Based Schiff Base

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • Mayuri S. Kulkarni,
  • Ashok V. Borhade,
  • Prajkta Y. Pachorkar,
  • Ankita M. Rayate

摘要

Abstract

A novel naphthalene-based Schiff base ligand (SBL) was synthesized by the condensation of naphthalene-1-8-diamine with 4-dimethylaminobenzaldehyde as a colorimetric probe for the selective detection of Fe3+ ions in ethanol solution. The UV-Vis spectroscopic technique was employed to study the sensing ability of the probe SBL for Fe3+ ions, which was monitored in ethanol solution (pH 4). The Job’s plot confirmed a 1 : 1 molar complex formation between SBL and Fe3+. Density functional theory computations also supported the binding framework between SBL and Fe3+. The limit of detection for Fe3+ is 6 × 10–6 M, and the limit of quantification is 2 × 10–5 M. The binding constant, evaluated using the Benesi–Hildebrand method, is 6.9 × 104 M. Cyclic voltammetry study shows that there is no change in the electrochemical structure of SBL after complex formation with Fe3+.