REFINED STRUCTURE OF CEKFE(CN)6.4H2O

Single crystals of cerium potassium ferrocyanide tetrahydrate are prepared by slow diffusion. The hexagonal form of CeKFe(CN)6·4H2O crystallizes in the space group P63/m (C6h2, No. 176), with lattice constants a = 7.392(1) Å and c = 13.871(1) Å. The experimental density is 2.336(2) g-cm-3 (pc = 2.341 g-cm-3). The nine-coordinated CeN6(H2O)3 groups are linked to the octahedral FeC6 groups by cyanide bridges. The structure of the title compound has been determined from single crystal X-ray diffraction data. The final refinement based on 1157 independent reflections has yielded an R-value of 0.034. Important bond distances are: CeN = 2.556(2) Å, FeC = 1.911(1) Å, and CN = 1.158(1) Å. © 1979.