Internal rotation and phase transitions in lanthanum tetrahydroborates
Journal Article
·
· J. Struct. Chem. (Engl. Transl.); (United States)
Using the /sup 1/H, /sup 11/B, /sup 139/La NMR and relaxation NMR methods, we have investigated the molecular dynamics in La(BH/sub 4/)/sub 3/ and its adduct with tetrahydrofuran La(BH/sub 4/)/sub 3/ x 3THF. We have observed phase transitions connected with the change in the nature of the internal rotation (reorientation) of the BH/sub 4//sup -/ anions. We have determined the barrier to reorientation of the BH/sub 4//sup -/ anions and the THF molecules in the investigated compounds, and we have shown that the change in the mobility of the THF molecule does not lead to a phase transition.
- OSTI ID:
- 6480239
- Journal Information:
- J. Struct. Chem. (Engl. Transl.); (United States), Vol. 29:1; Other Information: Translated from Zhurnal Strukt. Khimi.; 29: No. 1, 69-72(Jan-Feb 1988)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
BOROHYDRIDES
ORDER-DISORDER TRANSFORMATIONS
LANTHANUM COMPOUNDS
TETRAHYDROFURAN
ADDUCTS
BORON 11
COUPLING CONSTANTS
HYDROGEN 1
LANTHANUM 139
MAGNETIC DIPOLE MOMENTS
NMR SPECTRA
QUADRUPOLE MOMENTS
RELAXATION TIME
SPIN-LATTICE RELAXATION
SYMMETRY
TRANSITION TEMPERATURE
BORON COMPOUNDS
BORON ISOTOPES
DIPOLE MOMENTS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LANTHANUM ISOTOPES
LIGHT NUCLEI
MAGNETIC MOMENTS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RELAXATION
SPECTRA
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
400201* - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
BOROHYDRIDES
ORDER-DISORDER TRANSFORMATIONS
LANTHANUM COMPOUNDS
TETRAHYDROFURAN
ADDUCTS
BORON 11
COUPLING CONSTANTS
HYDROGEN 1
LANTHANUM 139
MAGNETIC DIPOLE MOMENTS
NMR SPECTRA
QUADRUPOLE MOMENTS
RELAXATION TIME
SPIN-LATTICE RELAXATION
SYMMETRY
TRANSITION TEMPERATURE
BORON COMPOUNDS
BORON ISOTOPES
DIPOLE MOMENTS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LANTHANUM ISOTOPES
LIGHT NUCLEI
MAGNETIC MOMENTS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RELAXATION
SPECTRA
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
400201* - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies