Abstract

This study demonstrates the design, synthesis and sensing applications of a simple and efficient chemosensor, 2-(1,3-dioxo-1H-inden-2(3H)-ylidene)hydrazinecarbothioamide (R) for quick detection of Hg²⁺ and F⁻ in aqueous media using a colorimetric test, UV–Vis spectral analysis, and silica gel support. Sensor R showed the typical absorption peak at 305 nm for Hg²⁺ which is responsible for color change from yellow to colorless, while in the case of F⁻, R exhibits a major peak at 415 nm and a color change from yellow to red. The limit of detection (LOD) of R for the analysis of Hg²⁺ was calculated as 1×10⁻⁶ M while for F⁻, it was found to be 3.4×10⁻⁷ M. The binding modes of R with Hg²⁺ and F⁻ have been investigated by the Job’s plot, Benesi–Hildebrand (BH) method, ¹H NMR, FTIR and theoretical studies. The sensor R was reversible after treating it with reagents such as EDTA and calcium nitrate solution after contacting with Hg²⁺ and F⁻, respectively. The performance of R can be successfully applied for the analysis of F⁻ contents present in toothpastes.

Graphic abstract

A simple and efficient receptor ninhydrin-based Schiff’s base (R) for quick detection of Hg²⁺ and F⁻ in aqueous medium using colorimetric and UV–Vis spectral analyses.

中文翻译：

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基于茚三酮-硫代半碳酮的Hg 2+和F-离子的高选择性和灵敏发色传感器

摘要

这项研究演示了一种简单高效的化学传感器2-（1,3-dioxo-1H-inden-2（3H）-亚烷基）肼基碳硫磺酰胺（R）的设计，合成和传感应用，可快速检测Hg ²⁺和F ⁻在水性介质中使用比色测试，UV-Vis光谱分析和硅胶载体。传感器- [R显示了在对Hg 305处的典型吸收峰²⁺，其负责从黄色到无色的颜色变化，而在F的情况下^- ，- [R表现出在415nm处的主峰和从黄色到红色的颜色变化。用于分析Hg ²⁺的R的检出限（LOD）计算为1×10^-6中号而对于˚F ^- ，它被认为是3.4×10 ^-7 M的结合方式- [R与汞²⁺和F ^-通过作业的情节，Benesi-希尔德布兰德（BH）方法已经被研究，^1个ħ NMR，FTIR和理论研究。该传感器- [R是与汞接触后用试剂如EDTA和硝酸钙溶液处理后是可逆的²⁺和F ^- ，分别。的性能- [R可以成功地应用于为F的分析^-内容存在于牙膏。

图形摘要

一个简单的和有效的受体茚三酮为基础的席夫碱（[R ）为快速检测的Hg ²⁺和F ^-使用在含水介质色度和紫外-可见光谱分析。