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

Abstract

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 (NO − 2) anion in aqueous media. The electrode exhibited a linear response to NO − 2 with a detection limit of 5.76 μM and displayed a linear Nernstian slope over the nitrite concentration range of 1.0 × 10 −5-1.0 × 10 −1 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.

Two New Fluorinated Phenol Derivatives Pyridine Schiff Bases: Synthesis, Spectral, Theoretical Characterization, Inclusion in Epichlorohydrin-β-Cyclodextrin Polymer, and Antifungal Effect

“…Purity of both F1 and F2 was confirmed by mass spectra (Figures S2 , S3 in the Supplementary Materials) and thin layer chromatography (TLC) (Table S1 in the Supplementary Materials). FTIR for F1 presented bands at 3,483 and 3,298 cm −1 assigned as the stretch modes of the –OH group; and the doublet signals at 3,134 and 3,077 cm −1 for characteristic stretch modes of the –NH 2 group (Carreño et al, 2014 ; Yilmaz et al, 2017 ). In the case of F2 , the FTIR spectrum showed signals at 3,483 cm −1 (νOH); 3,288 cm −1 (νOH); 3,153 and 3,057 cm −1 (νNH 2 ) and at 2,959 cm −1 , assigned to the stretch modes of –CH groups (Bukowska, 1979 ; Singh, 2008 ; Greve et al, 2012 ) (Figures S4 , S5 in the Supplementary Materials).…”

Reaction of N, N-phenylenebis(salicyalideneiminato)cobalt(III) and l-cysteine in mixed aqueous medium: kinetics and mechanism

“…On the other hand, these complexes have been utilized extensively to imitate cobalamin (B 12 ) coenzymes (Aly, 1998;Amirnasr et al, 2001;Cini et al, 1998;Polson et al, 1997), classified as an oxygen carrier (Niederhoffer et al, 1984) and oxygen activators (Bianchini and Zoellner, 1996;Henson et al, 1999;Yamada, 1999). Metal complexes of salophen (bis(salicylidene)phenylenediamine) and salen-type ligands also find applications in the intercalation of DNA base pairs (Kocak et al, 2016;Yilmaz et al, 2017) and for potentiometric discoveries of basic anions existing in biological and environmental systems (Kleij et al, 2006). Salophen-type ligands have additionally been utilized as nitrite sensors (Ganjali et al, 2004).…”

Two binuclear silver(I) complexes containing V‐shaped bis (benzimidazole) ligands: Syntheses, structures, and electrochemical sensing toward hydrogen peroxide

“…The major classes of electrode materials applied in the field of electrochemistry include enzymes, metal oxides, metal complex composite electrode materials and so on. [16][17][18][19][20][21][22] Nevertheless, enzymes have expensive prices and metal oxides with low purity, these shortcomings greatly limit their application in practice. In contrast, metal complexes not only possess easily regulated structures and high purity, but more importantly, their modified carbon paste electrodes show the advantages of easy fabrication, cheap cost, rapid surface renewal and reusability.…”