The Mössbauer effect and chemistry. Part II. Complexes of iron(II) and iron(III) with 1,2-di(salicylideneamino)ethane, 1,10-phenanthroline, and related compounds

Abstract

Mössbauer spectra of the compounds Fe phenCl₃ and Fe₂phen₃Cl₆(phen = 1,10-phenanthroline) are reported, and structures for these compounds advanced. Data are presented for the binuclear compounds [phen₂FeCl(O)ClFe phen₂]Cl₂,4H₂O and [Fe salen]₂O [salen = 1,2-di(salicylideneamino)ethane] and shown to be consistent with the presence of octahedrally co-ordinated Fe(iii) with S= 5/2. Large quadrupole splitting are found for the compounds [Fe phen₃](ClO₄)₃ and [Fe bipy₃](ClO₄)₃(bipy = bipyridyl). The chemical isomer shifts are additive for the series of compounds K₄[Fe^II(CN)₆],3H₂O, K₂[Fe^II(CN)₄phen],Fe^II(CN)₂phen₂, and [Fe^IIphen₃](ClO₄)₂. Tripyridylamine (tripam) forms complexes [Fe^IItripam₂](ClO₄)₂ with S= 0 and [Fe^IItripam₂][FeCl₄] with S= 0 for the cation and S= 2 for the anion. A similar compound is formed with Fe(II) and biacetyl dihydrazone (Bdh).