Porphyrin-Fe(II/III) prosthetic group in hemoglobin, myoglobin, cytochromes, peroxidases. Axial ligand geometry (5-coordinate vs 6-coordinate) and spin state (high vs low) control O₂-binding, electron transfer, or catalysis mode.
Porphyrin-Fe(II/III) prosthetic group in hemoglobin, myoglobin, cytochromes, peroxidases. Axial ligand geometry (5-coordinate vs 6-coordinate) and spin state (high vs low) control O₂-binding, electron transfer, or catalysis mode.