The Structure Model of an Inorganic Ion Exchanger Cobalt(II)-hexacyanoferrate(II)

Abstract

Abstract Cobalt(II)-hexacyanoferrates(II) with incorporated monovalent Na+, K+ , NH4 + and Cs+ ions have been synthetized. Chemical composition and structure of the unit cell of the crystallites have been determined by X-ray and IR analysis. It has been found that all crystallites containing the monovalent cations are isomorphous having an FCC structure, whereas the cobalt(II)-hexacyanoferrate(II) crystallites tetragonally. In order to explain the properties of these crystallites (which are similar to zeolites) causing their selectivity to monovalent cations, a structure model has been proposed. The values of effective radii of the "cages" and their entrances have been calculated.