Volatility and molecular structure of neptunium(IV) borohydride
Journal Article
·
· J. Am. Chem. Soc.; (United States)
The structure of Np(BH/sub 4/)/sub 4/ was determined by single-crystal x-ray diffraction methods at 130 K. The crystals are tetragonal, space group P4/sub 2//nmc; a = 8.559 (9) A, c = 6.017 (9) A, Z = 2.R = 0.114 for 352 reflections (Mo K..cap alpha.. radiation). The four borohydride ions are disposed tetrahedrally about the Np with Np-B distances of 2.46 (3) A. The boron atoms are connected to the Np atom with triple hydrogen bridge bonds similar to the terminal borohydrides in uranium borohydride. Hydrogen atoms were observed in the Fourier maps and refined. This molecular structure is similar to that found for hafnium and zirconium borohydride, but the space group is different. The vapor pressure, 10 mmHg at 25/sup 0/C, was measured in the range of -5 to 25/sup 0/C using a Bourdon gauge.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5279328
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 102:2; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
BORIDES
BORON COMPOUNDS
CRYSTAL STRUCTURE
DATA
DATA FORMS
EXPERIMENTAL DATA
INFORMATION
ISOLATED VALUES
MOLECULAR STRUCTURE
NEPTUNIUM BORIDES
NEPTUNIUM COMPOUNDS
NUMERICAL DATA
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
VAPOR PRESSURE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
BORIDES
BORON COMPOUNDS
CRYSTAL STRUCTURE
DATA
DATA FORMS
EXPERIMENTAL DATA
INFORMATION
ISOLATED VALUES
MOLECULAR STRUCTURE
NEPTUNIUM BORIDES
NEPTUNIUM COMPOUNDS
NUMERICAL DATA
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS
VAPOR PRESSURE