⁵⁷Fe Absorption and Emission Mössbauer Spectroscopy in Co (III) Acetylacetonate

Abstract

The results of a comparative investigation of the electronic behavior of 67Fe impurities diluted in Co (111) acLtylacetonate is reported for conditions in which these impurities are introduced either chemically or by 57Co electron capture decay. The 57Fe absorber experiments provide evidence for a 112 electronic ground state in this host. The 5 7 C~ source experiments show that a fraction of the EC decay products stabilizes as substitutional Fe3+ sites, while another part occupies defect sites both, as Fea+ and aliovalent Fez+ ions. The anomalous Fea+ component does not reveal the expected paramagnetic relaxation effects. This behavior is attributed to the creation of paramagnetic radicals as a consequence af the self-radiolysis associated with the Auger deexcitation.

57Fe Absorption and Emission Mössbauer Spectroscopy in Hydrated and Anhydrous Iron(II) and Cobalt(II) Acetylacetonates

“…This gives rise to a distribution of hyperfine interactions which is observed as line broadening. The whole of these results agrees with those reported separately [ 18,191 in other polyatomic ligand compounds. The stabilization mechanisms of the several iron species in acetylacetonate hosts will be discussed in detail in a subsequent paper which deals partially with the after-effects of 57C0 EC decay in Co(acac), [18].…”