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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4135
Title: Nickel pyrazolyl borate complexes: Synthesis, structure and analytical application in biological and environmental samples as anion selective sensors
Authors: Singh A.K.
Aggarwal V.
Singh U.P.
Mehtab S.
Published in: Talanta
Abstract: A [{hydrotris(3-phenyl-5-methyl-1-pyrazolyl)borate}(3-phenyl-5-methyl-pyrazole) nickel chloride] [TpPh,MeNi(Cl)PzPh,MeH] (I) has been synthesized and explored as ionophores for the preparation of a poly (vinyl chloride) (PVC) membrane sensor for azide and thiocyanate anions. The compounds [TpPh,MeNi(N3)PzPh,MeH] (II) and [TpPh,MeNi(SCN)PzPh,MeH] (III) were characterized by their crystal structures and proved to be bonded as monodentate through nitrogen atom of azide and thiocyanate anion. Potentiometric investigations also indicate high affinity of this receptor for thiocyanate and azide ions. PVC based membranes of I using as hexadecyltrimethylammonium bromide (HTAB) cation discriminator and o-nitrophenyloctyl ether (o-NPOE), dibutylphthalate (DBP), acetophenone (AP) and tributylphosphate (TBP) as plasticizing solvent mediators were prepared and investigated as SCN- and N3 - selective sensors. The best performance was shown by the membrane of thiocyanate with composition (w/w) of (I) (7%):PVC (31%):DBP (60%):HTAB (2%). This sensor works well over a wide concentration range 5.3 × 10-7 to 1.0 × 10-2 M with Nernstian compliance (59.2 mV decade-1 of activity) within pH range 2.5-9.0 with a response time of 11 s and showed good selectivity for thiocyanate ion over a number of anions. The sensor exhibits adequate life (3 months) and could be used successfully for the determination of thiocyanate content in human urine, saliva and river water samples. While the membrane of [TpPh,MeNi(Cl)PzPh,MeH] ionophore with composition (I) (6%):HTAB (4%):PVC (31%):TBP (59%) showed highest sensitivity and widest linear range for azide ion. These sensors exhibit the maximum working concentration range of 8.1 × 10-6 to 1.0 × 10-2 M with Nernstian slope of 59.3 mV decade-1 of activity. It can be applied for the monitoring of the azide ions concentration in aqueous black tea and orange juice samples. © 2008.
Citation: Talanta (2008), 77(2): 718-726
URI: https://doi.org/10.1016/j.talanta.2008.07.029
http://repository.iitr.ac.in/handle/123456789/4135
Issue Date: 2008
Publisher: Elsevier
Keywords: Ion selective membrane sensors
PVC membrane
Pyrazolylborate nickel complexes
ISSN: 399140
Author Scopus IDs: 57209223382
16444161100
57203181883
8954152100
Author Affiliations: Singh, A.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Aggarwal, V., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Singh, U.P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Mehtab, S., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Corresponding Author: Singh, A.K.; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India; email: akscyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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