Darroudi Mahdieh, Mohammadi Ziarani Ghodsi, Ghasemi Jahan B, Badiei Alireza
Department of Chemistry, Faculty of Physic and Chemistry, Alzahra University, Tehran P.O. Box 1993893973, Iran.
School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
Heliyon. 2020 Sep 20;6(9):e04986. doi: 10.1016/j.heliyon.2020.e04986. eCollection 2020 Sep.
A new fluorescent chemosensor based on quinoxaline was successfully synthesized through a facile and green catalytic reaction of phenylenediamine (-PDA) and acenaphthylene-1,2-dione in the presence of SBA-Pr-SOH. Prepared a "" quinoxaline-based receptor to recognized Hg ion in high selectively and, without any interference from other metal ions, was developed. The photophysical behavior of this fluorophore was studied in acetonitrile by using fluorescence spectra. The fluorescence properties of several cations to acenaphtoquinoxaline were investigated in acetonitrile, and the competition test displayed that the probe fluorescence changes were specific for Hg ion. The obtained results have shown high selectivity and sensitivity only for Hg. Also, the detection limit was as low as 42 ppb, and a top linear trend was observed between the concentration of Hg ions and fluorescence intensity. The binding stoichiometry between chemosensor and Hg was found to be 1:1. Moreover, a computational study was performed to obtain an electronic description of the fluorescence emission and quenching mechanisms. The optimized structures and binding mechanisms were supported with a high correlation and agreement by spectroscopy and DFT calculations.
通过在SBA-Pr-SOH存在下，对苯二胺（-PDA）和苊烯-1,2-二酮进行简便的绿色催化反应，成功合成了一种基于喹喔啉的新型荧光化学传感器。制备了一种基于喹喔啉的受体，该受体能够高选择性地识别Hg离子，且不受其他金属离子的任何干扰。利用荧光光谱在乙腈中研究了该荧光团的光物理行为。在乙腈中研究了几种阳离子对苊并喹喔啉的荧光性质，竞争试验表明，探针的荧光变化对Hg离子具有特异性。所得结果表明，该方法仅对Hg具有高选择性和高灵敏度。此外，检测限低至42 ppb，并且在Hg离子浓度与荧光强度之间观察到良好的线性关系。发现化学传感器与Hg之间的结合化学计量比为1:1。此外，还进行了计算研究，以获得荧光发射和猝灭机制的电子描述。光谱和密度泛函理论（DFT）计算高度相关且一致地支持了优化结构和结合机制。
