Department of Chemical Sciences, Tezpur University, Tezpur-784028, Assam, India.
Department of Chemistry, B. Borooah College, Guwahati-781007, Assam, India.
Dalton Trans. 2021 Nov 2;50(42):15287-15295. doi: 10.1039/d1dt02173g.
This work explores the position of the hydroxyl moiety and its participation in intramolecular H-bonding towards dictating the fluoride selective colorimetric response in functionalized thiourea derivatives. The study reveals the pivotal aspect of the hydroxyl moiety in C2 towards attaining selectivity for fluoride over acetate and dihydrogenphosphate ion. Furthermore, a methodology employing stabilization of deprotonated thiourea through metal ion (Ni and Cu) coordination is proposed for the colorimetric sensing of fluoride in water medium. The mechanism of interaction is thoroughly studied by UV-Vis, H NMR, ESR spectroscopy, electrochemical techniques and further validated by DFT calculations. This study reveals the formation of an Ni complex that shows greater stability in aqueous medium. The methodology is applied in the detection of fluoride in groundwater samples.
本工作探讨了羟基的位置及其在分子内氢键中的参与如何影响功能化硫脲衍生物对氟离子的选择性比色响应。研究揭示了 C2 中羟基在实现对氟离子选择性方面的关键作用，而不是对乙酸根离子和磷酸二氢根离子的选择性。此外，还提出了一种通过金属离子（Ni 和 Cu）配位稳定去质子化硫脲的方法，用于在水介质中对氟离子进行比色传感。通过 UV-Vis、H NMR、ESR 光谱、电化学技术等手段对相互作用机制进行了深入研究，并通过 DFT 计算进一步验证。该研究揭示了形成 Ni 配合物的过程，该配合物在水介质中具有更高的稳定性。该方法应用于地下水样品中氟化物的检测。
