Crystal and molecular structure of the compound Np(NO/sub 3/)/sub 4/ x 2C/sub 10/H/sub 10/N/sub 2/(NO/sub 3/)/sub 2/ x 2H/sub 2/O
The authors have carried out a complete determination of the crystal structure of the compound Np(NO/sub 3/)/sub 4/2C/sub 10/H/sub 10/N/sub 2/(NO/sub 3/)/sub 2/ x 2H/sub 2/O (CAD 4 SDP automatic diffractometer). The crystals are triclinic, a = 0.8445 (2) nm, b = 0.9013 (2) nm, c = 1.1870 (3) nm, ..cap alpha.. = 102.56 (2)/sup 0/, ..beta.. = 94.13 (2)/sup 0/, ..gamma.. = 90.75 (2)/sup 0/, space group P1, Z = 1, rho calc = 2.047 g/cm/sup 3/; R = 0.0192/ R/sub W/ = 0.0256 (3071 reflections, 313 variables, refinement by the full-matrix least-squares method in the anisotropic approximation for nonhydrogen atoms and the isotropic approximation for hydrogen atoms). They found and refined 11 of the 12 hydrogen atoms. The compound is a derivative of the hexanitrate complex of Np/sup 4 +/. The basic structural elements are the complex anions (Np(NO/sub 3/)/sub 6/)/sup 2 -/, the cations C/sub 10/N/sub 10/N/sub 2//sup 2 +/ (2,2'-bipyridinium), outer-sphere monodentate nitrate ions, and molecules of water of crystallization. The centrosymmetric complex anion (Np(NO/sub 3/)/sub 6/)/sup 2 -/ is formed by six nitrate ions, coordinated in a bidentate manner to the central Np/sup 4 +/ ion. The Np-O distances range from 0.2477 to 0.2529 nm (average, 0.2504 nm). The Np coordination polyhedron is a distorted icosahedron. The approximate symmetry of the anion is T/sub h/. The 2,2'-bipyridinium cation has a trans configuration; the plane of its ring is turned by 32/sup 0/. The formula of the compound should be represented as (C/sub 10/H/sub 10/N/sub 2/)/sub 2/(NO/sub 3/)/sub 2/Np(NO/sub 3/)/sub 6/ x 2H/sub 2/O.
- OSTI ID:
- 5739863
- Journal Information:
- Sov. Radiochem. (Engl. Transl.); (United States), Vol. 28:6; Other Information: Translated from Radiokhimiya; 28: No. 6, 685-690(Nov-Dec 1986)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NEPTUNIUM COMPLEXES
MOLECULAR STRUCTURE
TRICLINIC LATTICES
NEPTUNIUM NITRATES
PYRIDINIUM COMPOUNDS
BOND ANGLE
BOND LENGTHS
CHELATES
CHEMICAL COMPOSITION
HYDRATES
IONIC CRYSTALS
LATTICE PARAMETERS
LEAST SQUARE FIT
MONOCRYSTALS
SPACE GROUPS
STRUCTURAL CHEMICAL ANALYSIS
VALENCE
X-RAY DIFFRACTION
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
AZINES
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DIMENSIONS
HETEROCYCLIC COMPOUNDS
LENGTH
MAXIMUM-LIKELIHOOD FIT
NEPTUNIUM COMPOUNDS
NITRATES
NITROGEN COMPOUNDS
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PYRIDINES
QUATERNARY COMPOUNDS
SCATTERING
TRANSURANIUM COMPLEXES
TRANSURANIUM COMPOUNDS
360602* - Other Materials- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties