The Application of Manganese Complexes with Some Tetraazamacrocycles Immobilized in a Nafion Layer on a Glassy Carbon Electrode in Anodic Heterogenic Electrocatalysis

Modified electrodes were obtained by immobilizing Mn3+ complexes with the following tetraazamacrocycles (1,4,7,10-tetraazacyclododecane ([12]aneN4), 1,4,8,11-tetrazacyclotetradecane ([14]aneN4), 1,4,7,11-tetrazacyclotetradecane (iso[14]aneN4), and 1,4,8,12-tetrazacyclopentadecane ([15]aneN4) in a Nafion film on the surface of a glassy carbon electrode (GCE). Based on spectroelectrochemical, chronopotentiometric, and chronoamperometric studies, oxidation of mononuclear complexes to dinuclear di-μ-oxo complexes of Mn3+ and Mn4+ was observed, and the mechanism and influence of Nafion on this process were determined. On the basis of voltammetric and chronocoulometric studies, the electroactivity, stability, and diffusion rates of such modified electrodes were demonstrated. Based on voltammetric and chronocoulometric studies, their electrocatalytic properties were analyzed in relation to the oxidation of model compounds used in this type of research, namely, ascorbic acid, glycolaldehyde, and glycolic acid.