Journal of Chemical Sciences

, Volume 129, Issue 10, pp 1559–1569 | Cite as

A new Co(III) complex of Schiff base derivative for electrochemical recognition of nitrite anion

Regular Article


The synthesis and characterization of a new Co(III) complex of a salphen-type Schiff base ligand, (E)-2-{[(2-aminopyridin-3-yl)imino]methyl}-4,6-di-tert-butylphenol (HL), are reported. The characterization has been carried out using X-ray single crystallographic, thermogravimetric, and spectroscopic techniques. The complex has been combined with polyvinyl chloride (PVC) membrane of various compositions and tested as an electrochemical electrode towards recognition of several anions. The electrode exhibits exceptional electrochemical recognition for the nitrite \((\hbox {NO}_{2}^{-})\) anion in aqueous media. The electrode exhibited a linear response to \(\hbox {NO}_{2}^{-}\) with a detection limit of \(5.76\,{\upmu }\hbox {M}\) and displayed a linear Nernstian slope over the nitrite concentration range of \(1.0 \times 10^{-5}\)\(1.0\times 10^{-1}\,\hbox {M}\) in the pH range of 3–7 and a fast response time of less than 10 seconds. Theoretical calculations showed that the sensing could be via anion exchange in the Co(III) complex.

Graphical Abstract

SYNOPSIS An octahedral Co(III) complex of the salphen-type Schiff base, (E)-2-{[(2-aminopyridin-3-yl)imino]methyl}-4,6-di-tert-butylphenol, was synthesized, characterized and analyzed for its electrochemical anion recognition property through reversible anion exchange mechanism.


Schiff base nitrite anion sensor electrochemical recognition salphen ligand 



We gratefully acknowledge Ricardo B. Metz from the University of Massachusetts for allowing to use computer clusters and software packages in the calculations; Serkan Demir and Omer Andac from Ondokuz Mayis University for their valuable advice. The numerical calculations reported in this paper were partially performed at TUBITAK ULAKBIM, High Performance and Grid Computing Center (TRUBA resources).

Supplementary material

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Supplementary material 1 (docx 3637 KB)


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Copyright information

© Indian Academy of Sciences 2017

Authors and Affiliations

  1. 1.Department of ChemistryOndokuz Mayis UniversitySamsunTurkey
  2. 2.Department of ChemistryGebze Technical UniversityKocaeliTurkey

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