Abstract
Crystallographic structural refinements of hexagonal and orthorhombic EuKRu(CN) 6·4H 2O have been carried out by means of three-dimensional single-crystal X-ray diffractometry. The hexagonal form crystallizes in the space group P6 3/ m ( Z = 2) and the orthorhombic form crystallizes in the Cmcm space group ( Z=4). The respective lattice constants are a = 7.364(1), c = 13.779(3) A ̊ and a = 7.481(1), b = 12.858(3) and c = 14.357(1) A ̊ . A full-matrix least-squares refinement program yielded final reliability ( R) factors of 0.053 and 0.032 based on 496 and 876 unique reflections, respectively. In both structures, the RuC 6 groups are octahedrally oriented. In the hexagonal form, Eu atoms are nine-coordinate, EuN 6(H 2O) 3, and in the orthorhombic form, Eu atoms are eight-coordinate, EuN 6(H 2O) 2. Cyanide bridging links these Eu groups to the RuC 6 groups in both compounds building an infinite polymeric array with cavities within the structures. The cavities are occupied by K ions and uncoordinated zeolitic-type water molecules. Important bond distances and angles are tabulated.
Published Version
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