Yang Cuiping, Zhao Jianbo
School of Chemistry and Chemical Engineering, Tarim University Alar 843300 P. R. China
RSC Adv. 2024 Jan 3;14(2):1464-1471. doi: 10.1039/d3ra06558h. eCollection 2024 Jan 2.
A simple fluorescence chemosensor of FHS-OH based on salicylaldehyde Schiff base was developed a one-step reaction, which achieved a fast and highly selective response for Al(iii). Mechanism studies showed that when FHS-OH was exposed to Al(iii) with 1 : 2 binding stoichiometry in an aqueous solution at neutral pH, C[double bond, length as m-dash]N isomerization and PET processes were limited, resulting in a 'turn-on' fluorescence response with a low detection limit of 63 nmol L and a satisfying linear range of 0.0-20.0 μmol L. Compared to traditional detection methods for Al(iii), fluorometry using FHS-OH has several advantages, including simplicity, quick response, and capability of real-time detection. More importantly, the detection of Al(iii) on a solid matrix (test paper) was successfully achieved. After the addition of Al(iii), a significant emission colour change from green to bright blue was observed by the naked eye owing to the intrinsic aggregation-induced emission (AIE) characteristic of FHS-OH.
基于水杨醛席夫碱开发了一种简单的FHS-OH荧光化学传感器，通过一步反应实现了对Al(iii)的快速且高选择性响应。机理研究表明，当FHS-OH在中性pH的水溶液中以1:2的结合化学计量比与Al(iii)接触时，C=N异构化和PET过程受到限制，从而产生“开启”荧光响应，检测限低至63 nmol/L，线性范围为0.0 - 20.0 μmol/L。与传统的Al(iii)检测方法相比，使用FHS-OH的荧光测定法具有几个优点，包括简单、响应快和能够实时检测。更重要的是，成功实现了在固体基质（试纸）上对Al(iii)的检测。加入Al(iii)后，由于FHS-OH固有的聚集诱导发光（AIE）特性，肉眼可观察到明显的发射颜色从绿色变为亮蓝色。
