A new Cr3+ electrochemical sensor based on ATNA/Nafion/Glassy carbon electrode

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Abstract

A new electrochemical sensor of metal cation in an aqueous solution based on homobifunctional tridentate disulfide Schiffbase and named 1,1'-(-((disulfanediylbis(2,1-phenylene)) bis(azaneylylidene))bis(methaneylylidene))bis(naphthalene-2-ol) (ATNA) was easily obtained quantitatively fromthe condensation reaction of 2-hydroxy-1-naphthaldehyde and 2-aminothiophenol, and then fully characterized by spectroscopic techniques for structure elucidation. The molecular structure of ATNA was also confirmed by a single-crystal X-ray diffraction study to reveal a new conformation in which the molecule was stabilized by the O-H. N type intramolecular hydrogen bonding interactions in both moieties. The ATNA was used as a selective electrochemical sensor for the detection of chromium ion (Cr3+). A thin film of ATNA was coated on to the flat surface of glassy carbon electrode (GCE) followed by 5 % ethanolic Nafion in order to make the modified GCE (ATNA/Nafion/GCE) as an efficient and sensitive electrochemical sensor. It was found to be very effective and selective against Cr3+ cations in the company of other intrusive heavy metal cations such as Al3+, Ce3+, Co2+, Cu2+, Ga3+, Hg2+, Mn2+, Pb2+, and Y3+. The detection limit at 3 S/N was found to be 0.013 nM for Cr3+ ions within the linear dynamic range (LDR) (0.1 nM-10.0 mM) of Cr3+ ions with r2 = 0.9579. Moreover; this work instigates a new methodology for developing the sensitive as well as selective electrochemical toxic cationic sensors in the field of environmental and health care.

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El-Shishtawy, R. M., Rahman, M. M., Sheikh, T. A., Arshad, M. N., Al-Zahrani, F. A. M., & Asiri, A. M. (2020). A new Cr3+ electrochemical sensor based on ATNA/Nafion/Glassy carbon electrode. Materials, 13(12), 1–19. https://doi.org/10.3390/ma13122695

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