Journal of Fluorescence ( IF 2.6 ) Pub Date : 2021-01-08 , DOI: 10.1007/s10895-020-02673-1 Willsingh Anbu Durai 1 , Andy Ramu 1 , Amarajothi Dhakshinamoorthy 2
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Herein, a simple, efficient ratiometric chemosensor was reported for the selective sensing of Pb2+ and F− ions using thiophene functionalized hydrazone as a chemical probe. Hydrazone moiety was developed by utilizing thiophene/naphthalene as a platform for the particular recognition of cation and anion. The structures of the precursor (Z)-(1-(5-bromothiophen-2-yl)ethylidene)hydrazine (ABTH) and the final probe 1-((Z)-(((Z)-1-(5-bromothiophen-2-yl)ethylidene)hydrazono)methyl)naphthalen-2-ol (NAPABTH) were confirmed by 1H, 13C-NMR and LC-MS spectroscopic methods. The interaction of NAPABTH with Pb2+ and F− ions was visually observed by the formation of pink and dark yellow solutions, respectively. The detection limits were found to be very low for Pb2+ as 1.06 ppm and for F− ions as 3.72 nM. This visual detection of Pb2+/F− ions with satisfactory outcomes obtained from UV-Vis titrations. The sensing mechanistic pathways and stoichiometric ratios were obtained from DFT and Job’s plot, respectively. The observed results are highly promising as highly selective chemosensor with lower detection limits for Pb2+ and F− ions. This strategy could exhibit tremendous applications for the selective sensing of heavy metal cations with rapid sensitivity for the design of new devices.
Graphical abstract
中文翻译：
使用噻吩功能化腙选择性检测 Pb 2+ 和 F - 离子的视觉和比例化学传感器
在此，报道了一种使用噻吩功能化腙作为化学探针选择性检测 Pb 2+和 F -离子的简单、高效的比例化学传感器。腙部分是通过利用噻吩/萘作为特定识别阳离子和阴离子的平台而开发的。前体 (Z)-(1-(5-bromothiophen-2-yl)ethylidene)hydrazine (ABTH) 和最终探针 1-((Z)-(((Z)-1-(5-bromothiophen -2-基)亚乙基)腙)甲基)萘-2-醇(NAPABTH)通过1 H、13 C-NMR和LC-MS光谱方法证实。NAPABTH 与 Pb 2+和 F -的相互作用分别通过形成粉红色和深黄色溶液来目视观察 离子。发现 Pb 2+的检测限非常低，为 1.06 ppm，F -离子的检测限为 3.72 nM。这种对 Pb 2+ /F -离子的视觉检测获得了令人满意的结果，该结果是通过 UV-Vis 滴定获得的。传感机制路径和化学计量比分别从 DFT 和 Job 图中获得。观察到的结果非常有希望作为对 Pb 2+和 F -离子具有较低检测限的高选择性化学传感器。这种策略可以在重金属阳离子的选择性传感方面表现出巨大的应用，对新设备的设计具有快速的敏感性。
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