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Fluorescent chemosensors for Hg2+ ions based on a pyridine-attached phenanthridine probe
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-08-19 , DOI: 10.1039/d1nj03561d
Shanthi Seenan 1 , Saravanakumar Manickam 1 , Sathiyanarayanan Kulathu Iyer 1
Affiliation  

A ratiometric fluorescence phenanthridine sensor (4), functionalised with a pyridine moiety, has been prepared. 4 displayed both fluorescence and absorbance changes for the selective recognition of Hg2+ ions in acetonitrile/water as a solvent in the presence of other relevant interfering metal ions. 4 displayed a noticeable color change of blue to green under exposure to UV light at 365 nm. The binding constant value (Ka) was found to be 2.6198 × 108 M−1 for Hg2+ ions. The probe 4 showed a high selectivity and sensitivity for Hg2+ ions over other interfering competing cations. The ligand 4 interacted with Hg2+ ions to create a 1 : 1 complex, and 1H NMR titration and Job's plot studies further confirmed this mechanism. At the same time, 4 exhibits a high sensitivity to Hg2+ with a detection limit of 49.87 nM. The sensing can be carried out in a wide pH range of 3 to 11. In addition, the sensor 4 can be applied to living bacterial cells for ratiometric visual monitoring of Hg2+ ions by bioimaging. The real time analysis of 4 was also effectively verified by the determination of Hg2+ ions using a paper strip test kit and in different environmental water samples.

中文翻译:

基于连接吡啶的菲啶探针的 Hg2+ 离子荧光化学传感器

已经制备了用吡啶部分功能化的比率荧光菲啶传感器(4)图 4显示了在存在其他相关干扰金属离子的情况下选择性识别乙腈/水中的 Hg 2+离子作为溶剂的荧光和吸光度变化。在暴露于 365 nm 的紫外光下,图4显示出明显的蓝色到绿色的颜色变化。发现Hg 2+离子的结合常数值( K a )为2.6198 × 10 8 M -1。探针4对 Hg 2+显示出高选择性和灵敏度离子超过其他干扰竞争阳离子。配体4与 Hg 2+离子相互作用以产生 1:1 的复合物,1 H NMR 滴定和 Job's plot 研究进一步证实了这种机制。同时,4对Hg 2+表现出高灵敏度,检测限为49.87 nM。传感可以在 3 到 11 的宽 pH 范围内进行。此外,传感器4可以应用于活细菌细胞,通过生物成像对 Hg 2+离子进行比例视觉监测。Hg 2+的测定也有效验证了4的实时分析 使用纸条测试套件和不同环境水样中的离子。
更新日期:2021-09-07
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