Electrochemistry of manganese phthalocyanine in nonaqueous media

The electrochemical behaviour of manganese(II) phthalocyanine dissolved in pyridine, dimethylsulfoxide, or dimethylacetamide is reported, in the presence of perchlorate, chloride, and bromide supporting electrolyte anions. Electron transfer couples representing net oxidation of manganese, and of the phthalocyanine ring, and two net reductions of the phthalocyanine ring are characterised by a range of electrochemical techniques, with emphasis on cyclic voltammetry. Heterogeneous rate constants are reported for several of these couples in the presence of perchlorate ion. All the couples show close to ideal reversible behaviour except at higher scan rates for chloride and bromide as supporting electrolyte anions, where some deviation is observed. This system does not exhibit such sensitivity to environment as was previously observed with iron phthalocyanine. (Author)