Preparation and characterization of some hydroxy complexes of iron (III) porphyrins

Article abstract of DOI:10.1021/ic00136a057

Oxidation of (TMP)Fe^II or (T(2,4,6-MeO)₃PP)Fe^II (TMP is the dianion of meso-tetramesitylporphyrin; T(2,4,6-MeO)₃PP is the dianion of meso-tetrakis(2,4,6-trimethoxyphenyl)porphyrin) yields (TMP)FeOH or (T(2,4,6-MeO)₃PP)FeOH. These same hydroxy complexes are obtained by treating the corresponding PFe^IIICl (P is a generalized porphyrin dianion) with aqueous sodium hydroxide. Complexes of the type PFeOH are distinguished from the more common oxo-bridged dimers PFeOFeP on the basis of ¹H NMR spectra, magnetic susceptibilities, infrared spectroscopy, and electron spin resonance spectroscopy. These hydroxy complexes behave as typical high-spin, five-coordinate iron(III) compounds. Mixtures of PFeOH and PFeOFeP are formed when P is meso-tetrakis(3,4,5-trimethoxyphenyl)porphyrin dianion or meso-tetrakis-(perfluorophenyl)porphyrin dianion.