Abstract

Abstract On the basis of the X-ray photoelectron spectra of the valence levels and X-ray spectral lines S K β, Fe L α and Fe K β 5 , the structure of the valence levels of Na 2 [Fe(CN) 5 NO] (I), K[Fe 4 S 3 (NO) 7 ] (II) and Na 2 [Fe(NO) 2 (S 2 O 3 )] 2 (III) has been investigated. The level of the bond Fe 3 d -π* (NO) in (I) has been shown to correspond by ∼ 50% to the π (NO) orbitals. In the compounds (II) and (III), the direct FeFe interaction is not essential. The presence of delocalized loosening d *-levels in (II) and (III) increases the length of the FeN bond in these compounds in comparison with that observed in (I).

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