title: A possible model of hemoprotein-peroxide complexes formed in an iron-tetraphenylporphyrin system.
abstract: A ferric low-spin species with an anomalously small g3-g1 separation generated by the reaction of Fe(III)tetraphenylporphyrin with t-butylhydroperoxide in the presence of tatramethylammonium hydroxide was characterized by ESR spectroscopy. The reaction kinetics, investigated by monitoring ESR intensity, indicated that this low-spin complex is highly reactive and easily changed to non-heme type iron complexes. The rhombic parameters of this complex are very similar to those of heme-peroxide adducts such as [Fe(II)-hemoglobin-O2]- and [Fe(II)-horseradish peroxidase-O2]-.
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds; D006420:Hemeproteins; D007501:Iron; D008665:Metalloporphyrins; D008956:Models, Chemical; D010545:Peroxides
chemical_list: D005290:Ferric Compounds; D006420:Hemeproteins; D008665:Metalloporphyrins; D010545:Peroxides; C032547:iron tetraphenylporphyrin; D007501:Iron