Electrocatalytic Properties of Ni(II) Schiff Base Complex Polymer Films

Abstract

Platinum electrodes were modified with polymers of the (±)-trans-N,N′-bis(salicylidene)-1,2-cyclohexanediaminenickel(II) ([Ni(salcn)]) and (±)-trans-N,N′-bis(3,3′-tert-Bu-salicylidene)-1,2-cyclohexanediaminenickel(II) ([Ni(salcn(Bu))]) complexes to study their electrocatalytic and electroanalytical properties. Poly[Ni(salcn)] and poly[Ni(salcn(Bu))]) modified electrodes catalyze the oxidation of catechol, aspartic acid and NO2−. In the case of poly[Ni(salcn)] modified electrodes, the electrocatalysis process depends on the electroactive surface coverage. The films with low electroactive surface coverage are only a barrier in the path of the reducer to the electrode surface. The films with more electroactive surface coverage ensure both electrocatalysis inside the film and oxidation of the reducer directly on the electrode surface. In the films with the most electroactive surface coverage, electrocatalysis occurs only at the polymer–solution interface. The analysis was based on cyclic voltammetry, EQCM (electrochemical quartz crystal microbalance) and rotating disc electrode method.

The Influence of Electrolyte Type on Kinetics of Redox Processes in the Polymer Films of Ni(II) Salen-Type Complexes

“…In MeCN, the voltammetric curves were less electrochemically irreversible ( Figures S22A and S23A , ESI) than the curves recorded in CH 2 Cl 2 ( Figure 9 a and Figure S15A , ESI), which was also shown on the basis of previous electrocatalytic studies [ 49 ].…”

Modification of Glassy Carbon Electrodes with Complexes of Manganese(II) with Some Phenanthroline Derivatives Immobilized in Nafion Layer

“…In our previous papers, we reported on the modification of a platinum electrode with a salen-type complex [28,29] and glassy carbon electrode surfaces with manganese complexes of unsubstituted 1,10-phenanthroline immobilized in a Nafion layer [30,31]. We examined their stability and the charge transport through the layer and calculated the apparent diffusion coefficients.…”