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Dioxygen reduction catalyzed by substituted iron tetraphenylporphyrins in acidic media
Preview AbstractFive iron tetraphenylporphyrins including the (TPP)FeCl and its derivatives which contain electron-withdrawing or electron-donating substituents on the meso-phenyl rings of the porphyrin macrocycle were examined as catalysts for the electoreduction of dioxygen in 1.0 M HClO4. The investigated compounds are represented as (TpRPP)FeCl, where TpRPP is the dianion of the para-substituted tetraphenylporphyrin and R = NEt2, OMe, H, Br or CF3. Cyclic voltammetry and linear sweep voltammetry at a rotating disk electrode (RDE) or a rotating ring disk electrode (RRDE) were utilized to examine the catalytic activity of the compounds. The number of electrons transferred and the percentage of H2O2 produced as the product of O2 electroreduction were calculated. The investigated iron porphyrins containing electron-withdrawing substituents (R = Br and CF3) were shown to be more efficient catalysts for O2 reduction than the compounds having electron-donating groups (R = NEt2 and OMe) on the four phenyl rings of the porphyrin macrocycle.