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

Danuta Tomczyk,Karol Bester,Wiktor Bukowski,Michalina Kaczmarek

doi:10.3390/ma15010191

Danuta Tomczyk, Karol Bester + Show 2 more

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https://doi.org/10.3390/ma15010191

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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.

Highlights

Schiff Base Complex Polymer Films.Complexes of Ni (II) and other transition metals with Schiff bases of the N2 O2 type have been studied for a long time and are still under investigation
In the epoxidation of olefins [6]. Another reason for interest is the possibility of receiving electroactive polymer films on the electrode surfaces, which are used in electrocatalysis and electroanalysis [7,8,9,10,11,12,13,14,15,16,17,18]
In the case of poly[Ni(salcn)] in CH2 Cl2 and AN solutions, the oxidation process of the polymer deposited on the electrode surface depends on the electroactive surface coverage [37]

Summary

Introduction

Schiff Base Complex Polymer Films.Complexes of Ni (II) and other transition metals with Schiff bases of the N2 O2 type have been studied for a long time and are still under investigation. One of the reasons for interest is the use of these complexes in homogeneous electrocatalysis They were used, among others, to reduce alkyl and aryl halides [1], proton reduction [2,3] and oxidation of cycloalkenes [4]. In the epoxidation of olefins [6] Another reason for interest is the possibility of receiving electroactive polymer films on the electrode surfaces, which are used in electrocatalysis and electroanalysis [7,8,9,10,11,12,13,14,15,16,17,18]

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