Abstract
Abstract The IR spectra of nitrosyl(protoporphyrin IX dimethyl ester)iron(II) [Fe(ppdme)(NO)] complexes with various nitrogenous bases (B), such as imidazoles, pyridines, cyclic secondary amines, and aliphatic amines, were measured in benzene and 1,2-dichloroethane. The NO stretching frequencies (νNO) of these complexes and the equilibrium constants in equilibrium, [Fe(ppdme) (NO)]+B\ightleftharpoons[Fe(ppdme)(NO)B], decreased and increased respectively with an increase in the basicity, pKa(BH+), of the bases. These results are discussed in relation to the σ- and π-bonding abilities of the bases.
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