Abstract

Abstract Electron nuclear double resonance (ENDOR) spectroscopy of oxoiron(IV) porphyrin π-cation radical complexes with pyrrole β-substituted porphyrins is reported. Hyperfine coupling constants (AH) of the pyrrole β-methyl groups were determined. Comparison of the AH values with those of compound I of peroxidase and catalase indicated the a1u porphyrin π-cation radical states of these compound I.

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