Abstract
The crystal structures of sodium hexacyanoosmate, ruthenate and ferrate decahydrates, Na 4M(CN) 6·10H 2O(M=Os, Ru, Fe), have been determined from X-ray diffraction data and refined by full matrix least-squares to final agreement values: R = 0.038, R w = 0.039; R = 0.026, R w = 0.041; R = 0.060, R w = 0.043 for Os, Ru and Fe compounds, respectively. The compounds are isostructural and crystallize in the monoclinic space group P2 1/ n, Z = 2, with a = 9.154, b = 11.506, c = 9.876 Å, β = 97.95°; a = 9.146, b = 11.486, c = 9.867 Å, β = 98.00°; a = 9.038, b = 11.450, c = 9.782 Å, β = 97.57°, for Os, Ru and Fe compounds, respectively. The structure can be described as layers of hexacyanometallate anions, intercalated with layers of sodium polyhedra containing hydration water molecules and N atoms, perpendicular to the crystallographic ac plane. MetalC and CN distances for the hexacyanide anions are correlated with those from other structurally related moieties. The infrared spectra of the compounds are complementary with previous results for potassium salts.
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