A novel jointly colorimetric and fluorescent sensor for Cu2+ recognition and its complex for sensing S2- by a Cu2+ displacement approach in aqueous media
A novel jointly colorimetric and fluorescent sensor for Cu2+ recognition and its complex for sensing S2- by a Cu2+ displacement approach in aqueous media
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一种用于 Cu2 识别的新型联合比色和荧光传感器及其通过 Cu2 置换方法在水介质中感测 S2- 的复合物
DOI：
10.1016/j.saa.2018.06.068
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发表时间：
2018-11-05
影响因子：
4.4
通讯作者：
Wu, Fang-Ying
中科院分区：
文献类型：
--
作者：
Fang, Hao;Huang, Peng-Cheng;Wu, Fang-Ying
本工作合成了一种简单易行的席夫碱衍生物量热荧光传感器（1）：4-二甲氨基苯甲酸（2-咪唑甲醛）酰肼，用于Cu ~（2+）和S ~（2-）的检测。化合物1对Cu ~（2+）表现出明显的颜色变化和荧光增强的双重光谱响应。根据吸收和荧光响应，检测限分别为0.46 μ M和15 nM。两者均低于世界卫生组织（WHO）的饮用水指南（31.5 μ M）。此外，体系（1-Cu ~（2+））对低浓度的S ~（2-）具有选择性和灵敏度，当S ~（2-）加入时，体系（1-Cu ~（2+））中的Cu ~（2+）立即被去除，导致体系的颜色从黄色变为无色，并产生“关闭”荧光响应。方法的检出限分别为0.12 μ M（荧光法）和0.68 μ M（吸收法），均低于世界卫生组织（WHO）规定的饮用水中S2-的最高允许水平（15 μ M）。结合过程通过紫外-可见吸收光谱、荧光光谱、核磁共振氢谱、质谱和密度泛函理论计算得到证实。并成功地将试纸条应用于实际样品的S2-检测，实现了对真实的样品的方便、快速检测。(C)2018爱思唯尔B. V.保留所有权利。
In this work, a simple and easily synthesized Schiff-based derivative calorimetric and fluorescent sensor (1), 4-dimethylamino-benzoic acid (2-imidazole formaldehyde)-hydrazide, was obtained for the detection of Cu2+ and S2-. The compound 1 exhibited dual spectral responses to Cu2+, that is, vivid color change and fluorescence enhancement in the presence of Cu2+. The detection limits were valued as 0.46 mu M and 15 nM according to absorption and fluorescent response, respectively. Both of them are below the World Health Organization (WHO) guidelines for drinking water (31.5 mu M). In addition, the ensemble (1-Cu2+) selectively and sensitively detected a low concentration of S2- .As the addition of S2- instantly removed Cu2+ from the ensemble (1-Cu2+) resulting in a color change from yellow to colorless and a "turn-off" fluorescent response. The detection limit for S2- was estimated as 0.12 mu M (from fluorescent method) and 0.68 mu M (from absorption method), respectively, each of which was also lower than the maximum allowable level of S2- (15 mu M) in drinking water defined by the WHO. The binding process was confirmed via UV-vis absorption, fluorescence measurements, H-1 NMR, mass spectroscopy and density functional theory calculation. What's more, successful practical application of test paper is used to inspect the S2- which means the convenient and rapid assay in real samples can be achieved. (C) 2018 Elsevier B.V. All rights reserved.