Electrochemical nitric oxide sensors based on electropolymerized film of M(salen) with central ions of Fe, Co, Cn, and Mn

Electropolymerized film of metal ethylenebis(salicylideneiminate) [M(salen) , M = Co, Fe, Cu and Mn] was utilized as material for development of an ele ctrochemical sensor for the determination of NO in solution. The sensors ba sed on polymeric M(salen) were prepared by a means of electropolymerization with cyclic voltammetry (CV) in acetonitrile solution containing M(salen) for optimized cycles. Nafion was used as a second coating to the sensors an d differential pulse amperometry (DPA) was used as a subsequent determinati on technique. The resulted sensors were found to display good activity towa rd the oxidation of NO with low detection limits and a good linear relation ship between the current and NO concentration. The mechanism of the polymer ic M(salen) modified sensor was preliminarily studied by using a technique of quantum chemistry and proposed to be a three-dimensional catalytic patte rn by conjugation of the electron of the the NO molecule and the polymeric M(salen).