A mononuclear nonheme {FeNO} complex: synthesis and structural and spectroscopic characterization.

While the synthesis and characterization of {FeNO} complexes have been well documented in heme and nonheme iron models, {FeNO} complexes have been less clearly understood. Herein, we report the synthesis and structural and spectroscopic characterization of mononuclear nonheme {FeNO} and iron(iii)-nitrito complexes bearing a tetraamido macrocyclic ligand (TAML), such as [(TAML)Fe(NO)] and [(TAML)Fe(NO)], respectively. First, direct addition of NO to [Fe(TAML)] results in the formation of [(TAML)Fe(NO)], which is sensitive to moisture and air.