IRON(VI) IN TETRAHEDRAL OXO COORDINATION - A SINGLE-CRYSTAL EPR STUDY

The single crystal and powder EPR spectra of Fe(VI) in the host struct ures K(2)MO(4) (M = Cr, S, Se) were analyzed with respect to the fine structure parameters D and E. In the case of K2SeO4, which possesses t hree structural modifications in dependence on temperature, the number of crystallographically inequivalent Fe(VI) positions and the changes of the extent of polyhedral distortion could be followed by passing t he two phase transitions. AOM calculations were used in order to assig n the various EPR signals to the different sites.