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首页> 外文期刊>RSC Advances >Chromogenic 'naked eye' and fluorogenic 'turn on' sensor for mercury metal ion using thiophene-based Schiff base
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Chromogenic 'naked eye' and fluorogenic 'turn on' sensor for mercury metal ion using thiophene-based Schiff base

机译：使用基于噻吩的席夫碱对金属汞离子进行显色的“裸眼”和发荧光的“开启”传感器

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摘要

2-((3-Methylthiophen-2-yl)methyleneamino)benzenethiol (Probe 1) has been synthesized and successfully applied for the selective recognition of mercury metal ions and utilized as a fluorescence turn-on sensor for Hg2+ ion via chelation enhanced fluorescence (CHEF). The mechanism of the interaction of Probe 1 with metal ions has been deduced by the absorption, emission, H-1-NMR, and MALDI-TOF Mass analysis that intimate the favourable coordination of Hg2+ metal ion by the mercapto unit. The 2 : 1 stoichiometry of the sensor complex 1 + Hg2+ was calculated from the Job's plot based on UV-Vis absorption spectra. The binding constant (log beta(2)) of the 1 + Hg2+ complex was found to be 13.36 by Hill plot. The limit of detection (LOD) was also calculated from the fluorescence emission titration and found to be 20 mu M. Moreover the density functional theory (DFT) studies were investigated for the 1 + Hg2+ binding mechanism. Cyclic voltammograms also confirmed the recognition of Hg2+ metal ion to the Probe 1.
机译：合成了2-（（3-甲基噻吩-2-基）亚甲基氨基）苯硫醇（探针1），并成功地用于汞金属离子的选择性识别，并通过螯合增强的荧光作为Hg2 +离子的荧光开启传感器（厨师）。通过吸收，发射，H-1-NMR和MALDI-TOF质谱分析推导了探针1与金属离子的相互作用机理，该质谱分析通过巯基单元促进了Hg2 +金属离子的良好配位。传感器复合物1 + Hg2 +的2：1化学计量是基于紫外线-可见光吸收光谱从乔布图计算的。通过希尔图发现1 + Hg2 +复合物的结合常数（log beta（2））为13.36。还通过荧光发射滴定法计算了检测极限（LOD），发现其为20μM。此外，还研究了密度泛函理论（DFT）对1 + Hg2 +结合机理的研究。循环伏安图还证实了Hg2 +金属离子对Probe 1的识别。

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