Structures and properties of octaethylporphinato(phenolate)iron(III) complexes with NH⋯O hydrogen bonds: modulation of Fe-O bond character by the hydrogen bond

Iron(III) porphinate complexes of phenolate that have NH⋯O hydrogen bonds on the coordinating oxygen were synthesized as models of heme catalase. The NH⋯O hydrogen bonds in the complexes lower an electron donation from the coordinating oxygen to iron and induce a long Fe-O bond and a positive redox potential.