Department of Basic & Applied Science, National Institute of Technology Arunachal Pradesh, Jote 791113, India.
Department of Applied Chemistry, Sardar Vallabhbhai National Institute of Technology Surat, Gujarat 395007, India.
Methods. 2023 Nov;219:119-126. doi: 10.1016/j.ymeth.2023.10.005. Epub 2023 Oct 12.
In this paper, an amidopyrene-tagged reversible fluorescence probe 1 has been constructed for the detection of Au(III) ions in HO/CHCN (4/1, v/v). It is used to identify the Au(III) ions over several metal ions with excellent sensitivity (LOD: 0.061 µM). The fluorescence quenching of 1 with Au(III) ions might be attributed to the reverse PET process. Probe 1 recognized Au(III) by forming tetravalent geometry with the amide -NH, triazole moiety, free water, and Cl ion in 1:1 binding mode, which is evidenced by the DFT calculations, FT-IR spectroscopy, and HRMS value of the complex. The application utility of probe 1 was ascertained from the recovery of Au(III) ions from different sources of natural water samples. Interestingly, molecule 1 also showed aggregation-induced emission behavior at basic pH (>10) in HO/CHCN medium with high water content. The AIE might be attributed to the formation of self-associates of 1 upon the intermolecular H-bonding interactions between water and donor atom(s) of 1 or the increased polarity of the solvent medium.
在本文中，构建了一种带有酰胺基嘧啶标记的可逆荧光探针 1，用于在 HO/CHCN（4/1，v/v）中检测 Au(III)离子。它可用于识别多种金属离子中的 Au(III)离子，具有出色的灵敏度（LOD：0.061µM）。1 与 Au(III)离子的荧光猝灭可能归因于反向 PET 过程。探针 1 通过与酰胺 -NH、三唑部分、游离水和 Cl 离子形成四价几何形状来识别 Au(III)，以 1:1 的结合模式，这是由 DFT 计算、FT-IR 光谱和配合物的 HRMS 值证明的。从天然水样的不同来源中回收 Au(III)离子，证实了探针 1 的应用实用性。有趣的是，分子 1 在 HO/CHCN 介质中也在碱性 pH（>10）下表现出聚集诱导发射行为，该介质具有高含水量。AIE 可能归因于在水和 1 的供电子原子之间的分子间氢键相互作用下或溶剂介质的极性增加形成 1 的自缔合。
