Infrared and electron paramagnetic resonance study of nitrosyl(protoporphyrin IX dimethyl ester)iron(II) and its complexes with nitrogenous bases as model systems for nitrosylhemoproteins: effect of solvent polarity.

Infrared and electron paramagnetic resonance spectra of nitrosyl(protoporphyrin IX dimethyl ester)iron(II)(Fe(PPDME)(NO)) and its complexes with nitrogenous bases (N bases) such as imidazoles, pyridines, aliphatic amines, and anilines have been measured in various solvents. At room temperature, giso, Aiso, and nu NO values of five-coordinate Fe(PPDME)(NO) decreased with an increase in solvent polarity parameter ET, indicating the interaction between the solvent and the vacant axial coordination position. It has been found that the nu NO value of six-coordinate species is very sensitive to the solvent polarity, while the giso value is less sensitive. The solvent effect on the equilibrium constants, which are evaluated from the intensity change of the NO stretching band for five- and six-coordinate species, is discussed.