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⁺.

中文翻译：

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一种具有萘基希夫基的铁 （III） 比色检测探针

 抽象

通过萘-1-8-二胺与 4-二甲氨基苯甲醛缩合合成了一种新型萘基席夫碱配体 （SBL），作为比色探针，用于选择性检测乙醇溶液中的 Fe³⁺ 离子。采用紫外-可见光谱技术研究探针 SBL 对 Fe³⁺ 离子的传感能力，并在乙醇溶液 （pH 4） 中监测。Job 的图证实了 SBL 和 Fe³⁺ 之间形成了 1 ： 1 的摩尔复合物。密度泛函理论计算还支持 SBL 和 Fe³⁺ 之间的绑定框架。Fe³⁺ 的检测限为 6 × 10-6 M，定量限为 2 × ^10-5 M。使用 Benesi-Hildebrand 方法评估的结合常数为 6.9 × 10⁴ M。循环伏安法研究表明，与 Fe³⁺ 形成复合物后，SBL 的电化学结构没有变化。