Department of Chemistry, Veer Surendra Sai University of Technology, Burla, Sambalpur 768018, Odisha, India.
Photochem Photobiol Sci. 2018 Jun 13;17(6):815-821. doi: 10.1039/c8pp00108a.
Herein, for the first time, we have reported a copper(ii) bis(terpyridine) complex solution for instant 'naked eye' chromo-luminescent selective detection of fluoride ions in an acetonitrile medium at micromolar concentration. The copper complex [Cu(ii) (L)2] (NO3)2 [where L = 4'-(4-N,N'-dimethylaminophenyl)-2,2':6',2''-terpyridine] was characterized by mass spectroscopy and the terpyridine ligand by 1H NMR spectroscopy. The complex solution selectively discriminates F- ions from other anions such as AcO-, Br-, Cl-, CN-, H2PO4-, HSO4-, and I- in acetonitrile media via exceptional optical changes. The optical changes were evaluated by UV-visible and fluorescence techniques. Studies on the binding characteristics of the copper complex solution with fluoride ions revealed a displacement of copper ions from the complex solution as CuF2 resulting in the significant optical changes. Furthermore, displacement of Cu(ii) from the complex was established by means of mass spectroscopy in the presence of 20 equivalents of fluoride ions. The limit of detection (LOD) was found to be 5.07 μM which is within the permissible range of fluoride ions in drinking water set by the World Health Organization (WHO).
在此，我们首次报道了一种铜（ii）双（三联吡啶）配合物溶液，可在乙腈介质中于微摩尔浓度下即时进行“裸眼”显色发光选择性检测氟离子。铜配合物Cu(ii)(L)22[其中 L = 4'-(4-N,N'-二甲基氨基苯基)-2,2':6',2''-三联吡啶]通过质谱法进行了表征，三联吡啶配体通过 1H NMR 光谱法进行了表征。该配合物溶液通过特殊的光学变化，可从乙腈介质中的其他阴离子（如 AcO-、Br-、Cl-、CN-、H2PO4-、HSO4-和 I-）中选择性识别 F-离子。光学变化通过紫外-可见分光光度法和荧光技术进行了评估。研究了该铜配合物溶液与氟离子的结合特性，发现氟离子从配合物溶液中置换出铜离子，形成 CuF2，从而导致显著的光学变化。此外，通过质谱法在存在 20 当量氟离子的情况下，证实了铜（ii）从配合物中的置换。检测限（LOD）为 5.07 μM，这在世界卫生组织（WHO）规定的饮用水中氟离子的允许范围内。
