XANES and EXAFS investigations of bonding and structure of Ni and Co derivatives from Prussian Blue coordination compounds

The oxidation states of the transition metals in the chemically prepared nickel and cobalt Prussian White analoga Na2M[Fe(CN)6] and K2M[Fe(CN)6] as well as in the Prussian Blue analoga KM[Fe(CN)6] (M = Ni, Co) are investigated by analyzing the K-edge XANES and EXAFS spectra of the transition metals excited with synchrotron radiation. These similar substances exhibit different behavior depending on the insertion of nickel or cobalt. Structural data as derived from the EXAFS measurements are given.