Faculty of Science, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Nanotechnology Research Unit and Supramolecular Chemistry Research Unit, Mahasarakham University, Mahasarakham, Thailand.
Faculty of Science, Department of Chemistry, Supramolecular Chemistry Research Unit, Chulalongkorn University, Bangkok, Thailand.
Environ Technol. 2022 Apr;43(11):1723-1731. doi: 10.1080/09593330.2020.1850873. Epub 2020 Dec 7.
A highly sensitive and selective optical chemosensor () for determination of Au was prepared by covalent immobilization of rhodamine ethylenediamine on agarose gel. Spectrophotometric studies of complex formation, chemical structures and purity of the hydrogel sensor were carried out using TGA, NMR, TEM, and IR. The complexation study results indicated that this probe can selectively detect Au via a metal ion chelation-induced ring-opening reaction, and then caused a remarkable colour change from colourless to pink and a strong fluorescence enhancement. Theoretical DFT calculation results suggested that the hydrogel sensor formed stable complexes with Au through a large number of cation-dipole interactions. Reusability has been established by repeatedly dipping and rinsing the hydrogel in aqueous Au and EDTA in basic solutions. We believe that this approach may provide an easily measurable and inherently sensitive method for Au detection in environmental and biological applications.
通过将乙二胺罗丹明共价固定在琼脂糖凝胶上，制备了用于测定金的高灵敏度和选择性光学化学传感器。使用 TGA、NMR、TEM 和 IR 对配合物形成、水凝胶传感器的化学结构和纯度进行了分光光度研究。配合物研究结果表明，该探针可以通过金属离子螯合诱导的开环反应选择性地检测 Au，然后导致明显的颜色从无色变为粉红色和强烈的荧光增强。理论 DFT 计算结果表明，水凝胶传感器通过大量的阳离子-偶极相互作用与 Au 形成稳定的配合物。通过将水凝胶在含 Au 和 EDTA 的碱性溶液中反复浸泡和冲洗，已经确立了可重复使用性。我们相信，这种方法可能为环境和生物应用中 Au 的检测提供一种易于测量和固有敏感的方法。
