Jin Fengxiu, Yan Yan, Li Xinci, Liu Yucun, Liu Lihui
College of Chemistry, Jilin Normal University, Siping 136000, China.
College of Chemistry, Jilin Normal University, Siping 136000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 May 5;312:124059. doi: 10.1016/j.saa.2024.124059. Epub 2024 Feb 19.
Continuously monitorable fluorescence sensors can provide fast, immediate, in-field detection of analytes without tedious process. A simple fluorescent sensor (BN) constructed from naphthol Schiff base was developed for reversible monitoring of F and trace water. Sensor BN showed specific selectivity toward F over other anions giving rise to a fluorescence "turn-on" response. After added F, the BN solution caused a dramatically observable color change from non-fluorescence to blue-green, and the limit of detection reached 78.5 nM. The Job's and H NMR analysis confirmed that the recognition mechanism could be concluded to F caused deprotonation of sensor BN by hydrogen bonding interaction. Moreover, the deprotonated form BN∙F obtained by using F was acted as excellent sensitivity sensor for trace water detection with instant response through reprotonation. After addition of trace water, the emission color and spectral signal of BN∙F reverted to the original BN sate with the limit of detection of 0.0011 %. The reversible detection characteristic was conducive to the development of an inkless writing and encryption device. And importantly, BN∙F was utilized as a promising fluorescent sensor in the quantitative determination of water content in routinely chemical reagents.
可连续监测的荧光传感器能够在无需繁琐过程的情况下，对分析物进行快速、即时的现场检测。一种由萘酚席夫碱构建的简单荧光传感器（BN）被开发用于对氟离子和痕量水进行可逆监测。传感器BN对氟离子表现出相对于其他阴离子的特异性选择性，产生荧光“开启”响应。加入氟离子后，BN溶液发生显著的颜色变化，从无荧光变为蓝绿色，检测限达到78.5 nM。Job氏法和核磁共振分析证实，识别机制可归结为氟离子通过氢键相互作用导致传感器BN去质子化。此外，通过使用氟离子获得的去质子化形式BN∙F作为痕量水检测的优异灵敏度传感器，通过再质子化实现即时响应。加入痕量水后，BN∙F的发射颜色和光谱信号恢复到原始BN状态，检测限为0.0011%。这种可逆检测特性有利于无墨书写和加密装置的开发。重要的是，BN∙F被用作一种有前景的荧光传感器，用于常规化学试剂中水含量的定量测定。
