Crystal structure of rubidium (hydrogen phosphito)-phosphitodioxouranate(VI) trihydrate and potassium diphosphitodioxouranate(VI) dihydrate
The crystal structures of Rb(UO/sub 2/(HPO/sub 3/)(H/sub 2/PO/sub 3/) x 3H/sub 2/O (I) and K/sub 2/(UO/sub 2/(HPO/sub 3/)/sub 2/) x 2H/sub 2/O (II) have been determined (four circle automatic diffractometer, Mo K..cap alpha.. radiation, heavy-atom method). The crystals of complex I are monoclinic: ..cap alpha.. = 8.589(3), b = 10.275(1), c = 13.230(4) A, ..beta.. = 106.83(3)/sup 0/, space group P2/sub 1//n, Z = 4. The full matrix least-squares refinement on the basis of 1543 independent nonzero reflections gave R = 0.045. The crystals of complex II are also monoclinic: ..cap alpha.. = 7.598(3), b = 6.938(1), c = 10.617(4) A, ..beta.. = 110.84(2)/sup 0/, space group P2/sub 1/, Z = 2. The model was refined to R = 0.037 on the basis of 1680 independent reflections. The structure of complex I is built up from anionic layers based on pentacoordinated uranyl groups joined by tridentate bridging HOP/sub 3//sup 2 -/ groups (U-O = 2.34 to 2.35 A) and bidentate bridging H/sub 2/PO/sub 3//sup -/ groups (U-O = 2.38, 2.39(1) A). The rubidium cations are located between the layers and have polyhedrons of ir-regular shape (the coordination number is equal to 10 with Rb-O distances ranging from 218 to 3.2 A), which are formed by water molecules and oxygen atoms of phosphito and hydrogen phosphito groups. The uranyl group is symmetric (U-O = 1.78(2) A, and the O(1)UO(2) angle equals 177.8(5)/sup 0/) and is almost linear. In the phosphite and hydrogen phosphite ions the P-O/sub coord/ distances are equal to 1.49-1.52(1) A, and in the hydrogen phosphite ion the P-O/sub uncoord/ distance is increased to 1.56(1) A, possibly due to the fact that this O atom is protonated. The structure of complex II is also built up from layers. The pentacoordinated uranyl groups are joined to one another by tridentate bridging HPO/sub 3//sup 2 -/ groups (U-O = 2.34, 2.41, 2.42(1) A) and by bidentate bridging HPO/sub 3//sup 2 -/ groups (U-O = 2.30, 2.36(2) A). Hydrogen bonds were not found between the layers.
- Research Organization:
- N.S. Kurnakov Institute of General and Inorganic Chemistry, USSR
- OSTI ID:
- 6157811
- Journal Information:
- Sov. J. Coordinat. Chem.; (United States), Vol. 11:10; Other Information: Translated from Koordinatsionnaya Khimiya; 11: No.10, 1393-1398(Oct 1985)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
POTASSIUM COMPLEXES
MONOCLINIC LATTICES
STRUCTURAL CHEMICAL ANALYSIS
RUBIDIUM COMPLEXES
URANYL COMPLEXES
BOND ANGLE
BOND LENGTHS
CHEMICAL BONDS
COMPUTERIZED SIMULATION
CRYSTAL MODELS
INTERATOMIC DISTANCES
IONIC CRYSTALS
LATTICE PARAMETERS
MOLECULAR STRUCTURE
PHOSPHOROUS ACID
SPACE GROUPS
X-RAY DIFFRACTION
ACTINIDE COMPLEXES
ALKALI METAL COMPLEXES
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DIMENSIONS
DISTANCE
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LENGTH
MATHEMATICAL MODELS
SCATTERING
SIMULATION
URANIUM COMPLEXES
400201* - Chemical & Physicochemical Properties
360602 - Other Materials- Structure & Phase Studies