An electrochemical sensing platform based on a new copper complex for the determination of hydrogen peroxide and nitrite

Abstract

A new copper(II) complex [Cu(C 12 H 23 N 3 ) 4 Br 2 ·2H 2 O] was synthesized and its structure was characterized by x-ray crystallography and elemental analysis. The copper atom had a distorted octahedron coordination involving two bromide anions and four nitrogen atoms from the 1-decyl-1H-[1,2,4]triazole ligands. Moreover, the electrochemical behavior and electrocatalysis of the carbon paste electrode (Cu-CPE) bulk-modified by the complex have been studied in detail. The Cu-CPE showed excellent electrocatalytic activities toward the reduction of hydrogen peroxide and nitrite, and the detection limit was much lower than that mentioned in earlier reports. This bulk-modified CPE has good reproducibility, long-term stability and surface renewability, which appear promising for constructing chemical sensors.

Aquotris(benzotriazole)sulfatocopper(II).benzotriazole Framework Assembled on Multiwalled Carbon Nanotubes through π-π Interaction for H2O2Sensing in pH 7 Buffer Solution

“…37 In many of these studies redox active metal-organic complexes drop casted on carbon materials such as multiwalled carbon nanotubes (MWCNTs) were used as sensors. 18,38,39 Parnell et al have used Co(III)-amidomacrocyclic ligand based complex drop casted on MWCNTs to obtain a H 2 O 2 sensor. They were able to detect H 2 O 2 in the concentration range of 5 × 10 −8 M to 1 × 10 −4 M. 18 Zhuang et al have employed Cu-triazole mixed with carbon paste (Cu-CPE) as a sensor for H 2 O 2 and nitrite.…”

Bis(2,2′-bipyridil)Copper(II) Chloride Complex: Tyrosinase Biomimetic Catalyst or Redox Mediator?

“…Among the others, the copper complexes were also used as the mediators in electroanalysis, which were associated with improved sensitivity, selectivity and shorter response time [ 14 , 15 , 16 ]. Because of its application in a broad field such as pharmaceutical, textile and food manufacturing industries [ 17 ], medical diagnosis [ 18 ], water treatment [ 19 ], the determination of hydrogen peroxide (further only H 2 O 2 ) is important.…”

Experimental and Theoretical Investigations on Quadratic and Cubic Optical Nonlinearities of Cu(II), Co(II), Cd(II), Hg(II), Mn(II), and Zn(II) Transition Metal Coordination Complexes

“…The electrooxidation of Co­(I) to Co­(II) is fast and occurs at −1.369 V. At about −0.238 V, the reduction peaks corresponding to Co­(III)/Co­(II) reduction processes are observed. The subsequent reduction peak of Co­(II) → Co­(III) transformation is recorded at −0.980 V. The Cu­(MIPM) 2 Cl 2 complex shows two quasi-reversible peaks recorded at E 1/2 = 0.289 V and E 1/2 = −0.806 V corresponding to the electrochemical processes of Cu­(III)/Cu­(II) and Cu­(II)/Cu­(I), respectively. − In the case of mercury complex (Hg­(MIPM)­Cl 2 ), the voltammogram shows two well-defined redox systems at E 1/2 = −0.006 V and E 1/2 = −0.334 V. These peaks are attributed to two one-electron transfers of the couples Hg II+ /Hg I+ and Hg I+ /Hg 0 , respectively. , One irreversible cathodic peak was recorded at −1.511 V in the voltammogram of Zn­(MIPM) 2 Cl 2 . This peak corresponds to the reduction process of Zn­(II) to Zn(0).…”