Electrochemical Nitric Oxide Sensors Based on Electropolymerized Film of M(salen) with Central Ions of Fe, Co, Cu, and Mn

Abstract

Electropolymerized ®lm of metal ethylenebis(salicylideneiminate) [(M(salen), M Co, Fe, Cu and Mn] was utilized as material for development of an electrochemical sensor for the determination of NO in solution. The sensors based on polymeric M(salen) were prepared by a means of electropolymerization with cyclic voltammetry (CV) in acetonitrile solution containing M(salen) for optimized cycles. Na®on was used as a second coating to the sensors and differential pulse amperometry (DPA) was used as a subsequent determination technique. The resulted sensors were found to display good activity toward the oxidation of NO with low detection limits and a good linear relationship between the current and NO concentration. The mechanism of the polymeric M(salen) modi®ed sensor was preliminarily studied by using a technique of quantum chemistry and proposed to be a three-dimensional catalytic pattern by conjugation of the electron of the NO molecule and the polymeric M(salen).

Metallophthalocyanine-based molecular materials as catalysts for electrochemical reactions

“…Surface electrode modification is needed to make it sensitive and selective for NO. Among the widely used catalysts, planar macrocyclic metal complexes such as porphyrin [426][427][428][429][430], phthalocyanine [113,116,[431][432][433][434][435][436], vitamin B 12 [437] and related complexes [438] have been reported in the last few years. Table 9 recapitulates some significant examples of MPcs used for the electro-activation of NO.…”

Nanomaterials-based electrochemical sensors for nitric oxide

“…Macrocyclic metal complexes, including metalloporphyrins [31,[75][76][77], metallophthalocyanines [32][33][34][35][36] and metal-salen [37,78] are the common redox mediator chosen for the fabrication of catalytic NO sensors. These metal-ligand complexes can be incorporated with CNTs forming a catalytic coating for fabricating NO sensors [34,[79][80][81].…”

“…The sensitive sensing system is also well-designed to further improve the analytical performance of NO sensor. There are two major channels for the design of NO sensitive surface, one is to employ redox mediator, such as macrocyclic metal complexes [31][32][33][34][35][36][37][38], watersoluble dyes [39][40][41][42][43] or metalloproteins [44][45][46][47][48][49], and the other is to introduce nanomaterials for the construction of the sensing interface.…”

Electrochemical sensor for sulfite determination based on a nanostructured copper-salen film modified electrode

“…There has been abundant interest in the preparation and use of 0013-4686/$ -see front matter © 2009 Elsevier Ltd. All rights reserved. doi:10.1016/j.electacta.2009.03.045 chemically modified solid electrodes, including those coated with anodically polymerized films of metal salen complexes [19][20][21][22][23][24]. Salen complexes are conformationally flexible and adopt a variety of geometries to generate several active site environments allowing different oxidation reactions [25].…”