XAFS study of copper species stabilized in the interlayer space of layeredperovskite oxides

New intercalation compounds with Cu2+ ions in the interlayer of layered per ovskite oxides, OA(1-x)Ca(2-x)La(x)Nb(3)O(10) (OA = n-octylammonium ion, 0 less than or equal tox<1), have been prepared by ion-exchange reaction, and characterized by means of XRD and XAS. For the detail elucidation of the f ine structure of the Cu K-edge XANES spectra, polarized XAS was applied for the [Cu(en)(2)](2+) and Cu2+ ions intercalated to the single crystal. Acco rding to the XANES and EXAFS spectra measured at Cu K-edge, copper ions are four-coordinated. In addition, XANES spectra have shown that the charge tr ansfer from host layer to intercalated ions influences on the chemical stat e of copper ion.