Li Hui, Wang Jianzhi, Zhang ShuJiang, Gong ChenLiang, Wang Feng
Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology Wuhan 430205 P. R. China
College of Chemistry and Chemical Engineering, Lanzhou University Lanzhou 730000 P. R. China.
RSC Adv. 2018 Sep 12;8(56):31889-31894. doi: 10.1039/c8ra05280h.
The performance of a chemosensor is closely related to its structure. A new Schiff bass (DFSB) based on 4,5-diazafluorene units has been synthesized in this work. The interaction of DFSB with different metal ions has been studied using UV-vis absorption spectra and fluorescent spectra. The results show that DFSB is a highly selective and sensitive probe for Al ions over other commonly coexisting metal ions in ethanol. A very obvious fluorescence enhancement effect was observed, and a turn-on ratio over 1312-fold was triggered with the addition of 10 equiv. of Al ions. What is more, such fluorescent responses could be detected by the naked eye under a UV-lamp. The lowest detection limit for Al was determined as 3.7 × 10 M. The complex solution (DFSB-Al) exhibited reversibility with EDTA. These results may be caused by the unique molecular structure.
化学传感器的性能与其结构密切相关。本工作中合成了一种基于4,5-二氮杂芴单元的新型席夫碱（DFSB）。利用紫外可见吸收光谱和荧光光谱研究了DFSB与不同金属离子的相互作用。结果表明，在乙醇中，DFSB对铝离子具有高度选择性和灵敏性，对其他常见共存金属离子具有选择性。观察到非常明显的荧光增强效应，加入10当量的铝离子会引发超过1312倍的开启比率。此外，在紫外灯下肉眼可以检测到这种荧光响应。铝的最低检测限为3.7×10⁻⁸M。络合溶液（DFSB-Al）与乙二胺四乙酸（EDTA）表现出可逆性。这些结果可能是由独特的分子结构引起的。
