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A photo-induced electron transfer based reversible fluorescent chemosensor for specific detection of Mercury (II) ions and its applications in logic gate, keypad lock and real samples
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.arabjc.2020.11.017
R. Kumar , S. Ravi , C. Immanuel David , R. Nandhakumar

Abstract A quantitative mercuric detection is very important in the environmental and biological systems. In this paper, we report a novel bis-rhodanine derived fluorescent chemosensor for recognition of Hg2+ ion in DMSO-H2O (1:1) medium. The ‘turn-on’ fluorescence response was exhibited specifically toward Hg2+ over other metal ions by receptor R2 at 410 nm, which could be ascribed to the restriction of photo-induced electron transfer (PET) process and chelation-enhanced fluorescence (CHEF) effect upon the complexation with mercury ions. The complexing stoichiometry of receptor R2 to Hg2+ was estimated to be 1:1 according to Job’s plot experiments. The limit of detection was calculated to be 7.33×10−7 M based on the concentration dependent emission changes with good association constant of 8.97 × 104 M−1. As a result, we express that receptor R2 is a promising candidate for Hg2+ recognition without any significant interference of other co-existing cations. The receptor R2 was successfully applied to molecular logic and keypad lock applications and real water samples to determine its potential applications.

中文翻译:

一种基于光致电子转移的可逆荧光化学传感器,用于特异性检测汞 (II) 离子及其在逻辑门、键盘锁和真实样品中的应用

摘要 汞的定量检测在环境和生物系统中非常重要。在本文中,我们报告了一种新型的双罗丹宁衍生的荧光化学传感器,用于识别 DMSO-H2O (1:1) 介质中的 Hg2+ 离子。受体 R2 在 410 nm 处对 Hg2+ 比其他金属离子特异性地表现出“开启”荧光响应,这可能归因于光诱导电子转移 (PET) 过程和螯合增强荧光 (CHEF) 效应的限制与汞离子络合。根据 Job 的绘图实验,受体 R2 与 Hg2+ 的络合化学计量估计为 1:1。根据浓度相关的排放变化和 8.97 × 104 M-1 的良好结合常数,计算出检测限为 7.33×10-7 M。因此,我们表示受体 R2 是 Hg2+ 识别的有希望的候选者,没有其他共存阳离子的任何显着干扰。受体 R2 成功应用于分子逻辑和键盘锁应用和真实水样,以确定其潜在应用。
更新日期:2021-01-01
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