title: Synthesis and characterization of bis nitrato[4-hydroxyacetophenonesemicarbazone) nickel(II) complex as ionophore for thiocyanate-selective electrode.
abstract: The PVC based-ion selective electrode viz., bis nitrato[4-hydroxyacetophenone semicarbazone] nickel(II) as an ionophore was prepared for the determination of thiocyanate ion. The ionophore was characterized by FT-IR, UV-vis, XRD, magnetic moment and elemental analysis (CHN). On the basis of spectral studies an octahedral geometry has been assigned. The best performance was obtained with a membrane composition of 31% PVC, 63% 2-nitrophenyl octylether, 4.0% ionophore and 2.0% trioctylmethyl ammonium chloride. The electrode exhibited an excellent Nernstian response to SCN(-) ion ranging from 1.0 × 10(-7) to 1.0 × 10(-1)M with a detection limit of 8.6 × 10(-8)M and a slope of -59.4 ± 0.2 mV/decade over a wide pH range (1.8-10.7) with a fast response time (6s) at 25 °C. The proposed electrode showed high selectivity for thiocyanate ion over a number of common inorganic and organic anions. It was successfully applied to direct determination of thiocyanate in biological (urine and saliva) samples in order to distinguish between smokers and non-smokers, environmental samples and as an indicator electrode for titration of thiocyanate ions with AgNO3 solution.
authors.affiliation: Department of Chemistry, Zakir Husain Delhi College (University of Delhi), J. L. Nehru Marg, New Delhi 110002, India. Electronic address: schandra_00@yahoo.com.
authors.forename: Sulekh
authors.initials: S
authors.lastname: Chandra
authors.affiliation: Department of Chemistry, Acharya Narender Dev College (University of Delhi), Kalkaji, New Delhi 110019, India.
authors.forename: Sunita
authors.initials: S
authors.lastname: Hooda
authors.affiliation: Department of Chemistry, Zakir Husain Delhi College (University of Delhi), J. L. Nehru Marg, New Delhi 110002, India; Department of Chemistry, Acharya Narender Dev College (University of Delhi), Kalkaji, New Delhi 110019, India. Electronic address: praveen_tomar1979@yahoo.com.
authors.forename: Praveen Kumar
authors.initials: PK
authors.lastname: Tomar
authors.affiliation: Department of Chemistry, Zakir Husain Delhi College (University of Delhi), J. L. Nehru Marg, New Delhi 110002, India.
authors.forename: Amrita
authors.initials: A
authors.lastname: Malik
authors.affiliation: Kharvel Subharti College of Pharmacy, S. V. Subharti University, Meerut, Uttar Pradesh 250005, India.
authors.forename: Ankit
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Sri Aurobindo College (University of Delhi), New Delhi 110017, India.
authors.forename: Sakshi
authors.initials: S
authors.lastname: Malik
authors.affiliation: Department of Chemistry, Zakir Husain Delhi College (University of Delhi), J. L. Nehru Marg, New Delhi 110002, India.
authors.forename: Seema
authors.initials: S
authors.lastname: Gautam
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D007476:Ionophores / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D057230:Limit of Detection; D009532:Nickel / Q000737:chemistry*; D011199:Potentiometry; D012463:Saliva / Q000737:chemistry; D012664:Semicarbazones / Q000737:chemistry; D012907:Smoking; D012997:Solvents / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013861:Thiocyanates / Q000032:analysis* / Q000652:urine; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D007476:Ionophores; D007477:Ions; D012664:Semicarbazones; D012997:Solvents; D013861:Thiocyanates; D009532:Nickel; C031760:thiocyanate
keywords: Ni(II) complex; PVC membrane; Potentiometery; SCN(−) selective electrode