Highly oxidized iron complexes of N-methyltetra-p-tolylporphyrin
作者:Alan L. Balch、Charles R. Cornman、Lechoslaw Latos-Grazynski、Mark W. Renner
DOI:10.1021/ja00032a044
日期:1992.3
Two different, highly oxidized iron complexes of N-methyltetra-p-tolylporphyrin (N-MeTTPH) have been detected by H-1 and H-2 NMR spectroscopy after oxidation with m-chloroperoxybenzoic acid. In CH2Cl2/CH3OH (4:1, v/v) in the presence of sodium methoxide (N-MeTTP)Fe(II)Cl is converted to (N-MeTTP)Fe(II)(OCH3) and then to (CHO)(N-MeTTP)Fe(IV) = O upon addition of the peroxyacid. The latter is observable over the temperature range -90 to 0-degrees-C, has a magnetic susceptibility of 2.9-mu(B) (S = 1), and is reduced by phenyldimethylphosphine to (N-MeTTP)Fe(II)(OCH3). In the absence of sodium methoxide, (N-MeTTP)Fe(II)Cl is oxidized by the peroxyacid to form a very unstable species observable from -90 to -75-degrees-C whose H-1 NMR spectrum shows large hyperfine shifts for the meso aryl substituents that are consistent with the presence of a pi-N-methylporphyrin radical in the product.