Manganese 4,4′,4″,4‴-tetrasulphonated phthalocyanine, its dioxygen adduct, and e.s.r. evidence for intramolecular electron transfer in solution

Abstract

In the solid state the dioxygen adduct of manganese 4,4′,4″,4‴-tetrasulphonated phthalocyanine (MnTsPc) is best formulated as Mn^IIITsPcO₂^– and in solution the e.s.r. spectrum as a function of pH indicates hat there is an intramolecular electron transfer between Mn^IITsPcO₂^–; the superoxide is only stable between a pH of ca. 11.5 and 13.5 and evidence of oxidase activity is observed at pH > ca 14.