Mechanism of Catalytic O₂ Reduction by Iron Tetraphenylporphyrin.

ABSTRACT: The catalytic reduction of O₂ to H₂O is important for energy transduction in both synthetic and natural systems. Herein, we report a kinetic and thermochemical study of the oxygen reduction reaction (ORR) catalyzed by iron tetraphenylporphyrin (Fe(TPP)) in N, N'-dimethylformamide using decamethylferrocene as a soluble reductant and para-toluenesulfonic acid ( pTsOH) as the proton source. This work identifies and characterizes catalytic intermediates and their thermochemistry, providing a detailed mechanistic understanding of the system. Specifically, reduction of the ferric porphyrin, [Fe^III(TPP)]⁺_, forms the ferrous porphyrin, Fe^II(TPP), which binds O₂ reversibly to form the ferric-superoxide porphyrin complex, F

SUBMITTER: Pegis ML 

PROVIDER: S-EPMC6684231 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature