SYNTHESIS AND PROPERTIES OF ALKALI-METAL LITHIUM PERIODATOFERRATE(III) AND PERIODATOCOBALTATE(III) COMPLEXES

The pale-yellow LiMFeIO6 (M = K, Rb or Cs) have been prepared by react ion of MIO4, Li+ and [Fe(H2O)(6)](3+) in hot aqueous solution at pH 9. Olive-green LiMCoIO6 were prepared from MIO4, Li+ and [Co(H2O)(6)](2) in hot alkaline solution using ozonised oxygen as oxidant. These ins oluble powders have been characterised by analysis, IR and Raman, UV-V IS and EPR spectroscopy and magnetic measurements. PXRD studies reveal ed that they are amorphous, but structural data have been obtained via Fe or Co and I K-edge EXAFS, and are consistent with a layered period ate structure type similar to that found previously in MM'IO6 (M' = Mn , Ni, Ge, etc). Fe-57 Mossbauer data are reported for LiKFeIO6.