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A space-filling model showing the [FeIIIFeIV(μ-O)2] core structure of 1. Note that the complexes are valence-delocalized complexes and centrosymmetric, so the two iron centers (pink atoms) are equivalent. The approach of the alcohol substrate (ROH) to an iron center is hindered by pyridine rings (Py) from the two tetradentate ligands.
