Electrocatalytic Properties of Electropolymerized Ni(II)curcumin Complex

Abstract

The voltammetric behavior in alkaline solution of a nickel-based chemically modified electrode (poly-Ni(II)curcumin) prepared by oxidative electropolymerization of nickel-curcumin complex for electrooxidation of aliphatic alcohols was investigated by cyclic voltammetry and rotating disk technique (curcumin 1,7-bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione). The dependence of the oxidation current on the alcohol concentration and on the number of redox centers Ni(II)/Ni(III) is discussed. From the fact that the oxidation current increases with the increase of film thickness it is evident that the electrocatalytic reaction occurs inside the polymer film. The system examined is a typical example of a redox polymer with 3D properties. It is also concluded that the reaction mechanism of alcohol oxidation is the case, according to the concept of Andrieux and Saveant, where the cross-exchange reaction is the limiting step. The mechanism of modifying the film formation has also been discussed.

Structure regulation of Nickel (II) complexes with imidazole–tripodal ligand by altering the counter anions and the reaction conditions

“…The continuous cycling increased the current of latter peak, which indicates the formation of conductive poly-Ni(L) film growth on a glassy carbon electrode. The characteristics of the CVs are in very good agreement with those of the literature [19]. The formation of polymeric film suggests a high degree of adherence to the glassy carbon electrode.…”

Preparation of the carboxylic acid-functionalized graphene oxide/gold nanoparticles/5-amino-2-hydroxybenzoic acid as a novel electrochemical sensing platform

“…Continuous increase in the amplitude of the voltammometric peaks indicate that the Ni-MA film is formed as the number of cycles increased. The same results have been previously reported [32][33][34][35][36][37]. The redox reaction which occurs during cycles are related to the Ni(II)-MA/Ni (III)-MA transition.…”

Metal complexes of curcumin – synthetic strategies, structures and medicinal applications

“…The catalytic oxidation of methanol on a glassy carbon electrode which was electrochemically modified by a conductive Ni(II)-curcumin complex film was first reported in 1995. 47 In the course of this study, it was found that a glassy carbon electrode modified by this Ni(II)-curcumin film can act as a very effective catalyst for the oxidation of alcohols. Deposition of the nickel(II) curcumin complex was simply performed by contacting the clean electrode surface with a freshly prepared solution of curcumin, a Ni(II) salt and 0.1 M NaOH.…”