Abstract
Coordination of nitric oxide (NO) to meso-tetraphenylporphyrin cobalt in solutions containing methanol and in Nafion® film has been studied by cyclic voltammetry, visible spectroscopy, ESR and FTIR. Formation of Co IITPP(NO) has been observed in the alcoholic solutions of both Co II- and Co III-complexes in the presence of NO. The same reductive nitrosylation has been observed only for Co IIITPP + distributed in the hydrophobic part of the Nafion® film. The electrochemical oxidation of the resulting NO-complex in the methanolic solution and in Nafion® film has been monitored, and demonstrated the catalytic character under an excess of NO. A reaction scheme for the catalytic process, which includes reductive nitrosylation followed by oxidation of Co IITPP(NO) has been suggested. A possible role of trace amount of alcohols in the Nafion® film has been discussed.
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