College of Chemistry, Jilin Normal University, Siping 136000, China.
College of Chemistry, Jilin Normal University, Siping 136000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Feb 5;326:125245. doi: 10.1016/j.saa.2024.125245. Epub 2024 Oct 5.
A simple diphenylimidazole-based fluorescent sensor (DIP) had been designed for reversible fluorescence sensing of F and trace water. The sensor showed superior selectivity for F compared to other anions with fluorescence "turn on" mode. After adding F to CHCN solution of DIP, the emission color of DIP changed markedly from weak blue to strong cyan, which could be facilely discerned by the naked eye. The various technical analysis, including spectroscopies, H NMR titration and DFT calculation, indicated that the deprotonation of imidazole -NH and -OH occurred in the presence of F. The detection limit of DIP toward F could reach as low as 72.3 nM. Moreover, F-induced deprotonation of DIP-F system exhibited high sensitivity for water with the detection limit of 0.0015 vol%. The reversible switching characteristic of DIP prompted it suitable for the construction of molecular logic gate. In addition, DIP and DIP-F were successfully applied to the determination of F content in toothpaste and water content in table salt, sugar and tea, respectively. Moreover, DIP and DIP-F-coated filter paper strips could be used as fluorescent display materials for inkless writing with repeatability.
一种简单的二苯并咪唑基荧光传感器（DIP）被设计用于可逆荧光检测 F 和痕量水。与其他阴离子相比，该传感器对 F 具有优异的选择性，具有荧光“开启”模式。向 DIP 的 CHCN 溶液中添加 F 后，DIP 的发射颜色从弱蓝色显著变为强青色，肉眼可轻松识别。各种技术分析，包括光谱、H NMR 滴定和 DFT 计算，表明在 F 的存在下，咪唑 -NH 和 -OH 发生去质子化。DIP 对 F 的检测限低至 72.3 nM。此外，DIP-F 体系的 F 诱导去质子化对水具有高灵敏度，检测限为 0.0015 体积%。DIP 的可逆开关特性使其适合构建分子逻辑门。此外，DIP 和 DIP-F 成功应用于牙膏中 F 含量和食盐、糖和茶中含水量的测定。此外，DIP 和 DIP-F 涂覆的滤纸条可用作无墨书写的荧光显示材料，具有可重复性。
