For the two {FeNO} 6 complexes analyzed, [π*(NO)] 1 configurations also account for approximately two-thirds of the wave function, with the remaining third made up of a roughly even mix of [π*(NO)] 0 and [π*(NO)] 2 configurations. Given that the porphyrin is thought to be innocent with a formal charge of -2 in all the complexes, we may, accordingly, at least to a first approximation, describe the two complexes as Fe(III)-NO 0 . Such a description is at variance with from the popular view of low-spin, square-pyramidal or octahedral {FeNO} 6 complexes as Fe(II)-NO + , 2,19 but is consonant with Solomon 21 and coworkers' L-edge X-ray absorption study of an octahedral nonheme {FeNO} 6 complex with rather heme-like coordination. Another study by DeBeer, Meyer, and coworkers 20 has also reached a similar conclusion.