Crystal structure of rubidium (hydrogen phosphito)-phosphitodioxouranate(VI) trihydrate and potassium diphosphitodioxouranate(VI) dihydrate

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · Sov. J. Coordinat. Chem.; (United States)

OSTI ID:6157811

Mistryukov, V E; Mikhailov, Yu N

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), Journal Name: Sov. J. Coordinat. Chem.; (United States) Vol. 11:10; ISSN SJCCD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPLEXES
ALKALI METAL COMPLEXES
BOND ANGLE
BOND LENGTHS
CHEMICAL BONDS
COHERENT SCATTERING
COMPLEXES
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DIMENSIONS
DISTANCE
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERATOMIC DISTANCES
IONIC CRYSTALS
LATTICE PARAMETERS
LENGTH
MATHEMATICAL MODELS
MOLECULAR STRUCTURE
MONOCLINIC LATTICES
PHOSPHOROUS ACID
POTASSIUM COMPLEXES
RUBIDIUM COMPLEXES
SCATTERING
SIMULATION
SPACE GROUPS
STRUCTURAL CHEMICAL ANALYSIS
URANIUM COMPLEXES
URANYL COMPLEXES
X-RAY DIFFRACTION