Structural characterization of the water-soluble porphyrin complexes [Fe(II)(TPPS) (NO(•))](4─) and [μ-O-([Fe(III)(TPPS)])(2)](8─)

Iron water-soluble porphyrins have been long used as biomimetic compounds for modelling the active sites found in heme-enzymes. In this regard, the anionic porphyrin [Fe(III)(TPPS)](3─) and its coordination complexes have been repeatedly chosen as suitable water-soluble platforms for bioinorganic chemistry studies. In this work we report for the first time the crystal structure of the water-soluble nitrosyl complex [Fe(II)(TPPS) (NO(•))](4─) along with that of oxodimeric ferric species [μ-O-([Fe(III)(TPPS)])(2)](8─).