Crystal structure of N'-[(E)-(2-hydroxynaphthalen-1-yl) methylidene] benzenesulfonohydrazide (HNMBSH) and its application as Pb^sup 2+^ ion sensor by its fabrication onto glassy carbon electrode

• Published in: Inorganica Chimica Acta Vol. 467; p. 297
• Main Authors: Ahmad, Ikram, Arshad, Muhammad Nadeem, Rahman, Mohammed M, Asiri, Abdullah M, Sheikh, Tahir Ali, Aqlan, Faisal M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Science Ltd 01-10-2017
• Subjects: Benzene; Carcinogens; Crystal structure; Crystallization; Dynamic stability; Electrodes; Ethanol; Glassy carbon; Ions; Lead; NMR; Nuclear magnetic resonance; Organic chemistry; Performance enhancement; Pollutants; Public health; Response time; Sensitivity; Single crystals; Spectrum analysis; X-ray diffraction
• ISSN: 0020-1693; 1873-3255

Lead (Pb) is one of the ten most public health concern chemicals identified by World health organization (WHO). It is mostly present in Pb2+ form and enlisted in one of the most toxic having metals having capability to cause tumour. An excellent sensor, N′-[(E)-(2-hydroxynaphthalen-1-yl) methylidene] benzenesulfonohydrazide (HNMBSH) for Pb2+, is synthesized by following a simple condensation approach where 2-hydroxynaphthalene and benzene sulfonylhydrazide were reacted equi-molar in ethanol. The title compound was collected in very good yield and crystallized in ethanol. The structure was determined by 1H NMR, 13C NMR, UV/vis, FT-IR and single crystal X-ray diffraction. HNMBSH was fabricated on flat-glassy carbon electrode (GCE) with nafion i.e.; a conducting binder in phosphate buffer phase and used as Pb2+ short response time sensor. The fabricated HNMBSH/Nafion/GCE sensor is exhibited higher sensitivity, large-dynamic concentration ranges, long-term stability, and improved electrochemical performances towards Pb2+ ions. The calibration plot is linear over the large Pb2+ concentration ranges (0.1 nM to 1.0 mM). The sensitivity, detection limit and limit of quantification of this newly proposed method are found to be ∼3.956 µA mM−1 cm−2, ∼0.024 nM (signal-to-noise ratio, at a SNR of 3) and 0.08 nM respectively. This novel effort is initiated a well-organize way of efficient HNMBSH/Nafion/GCE sensor development with conducting binder deposited GCE for toxic heavy cationic pollutants in environmental and health-care fields in broad scales. Therefore, the HNMBSH/Nafion/GCE sensor offers a cost effective organic ligand that can be considered as a viable alternative for effectively detecting and removing hazardous and carcinogenic Pb2+ from real water samples.