UV-visible and infrared spectra of volatile uranyl complexes in the gas phase
The gas-phase UV-visible and infrared spectra of bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)dioxouranium(VI) (UO/sub 2/(HFA)/sub 2/) were found to exhibit a marked pressure and temperature dependence which appears consistent with the monomer-dimer equilibrium previously established for this compound. The visible spectra obtained for both the monomeric and dimeric species are unusual because the vibrational structure characteristic of the spectra of many uranyl compounds is completely absent. The IR spectra, which were in part obtained with a CW N/sub 2/O/CO/sub 2/ laser spectrometer, showed three bands attributable to the asymmetric stretch (..nu../sub 3/) of the uranyl group. A study of the pressure and temperature dependence of the intensity of these bands indicated that two could be assigned to the dimeric form and the third to the monomeric form. These observations permit the assignment of a probable structure to the dimeric form of UO/sub 2/(HFA)/sub 2/. Some preliminary observations on the spectra of the trimethylphosphate derivative (UO/sub 2/(HFA)/sub 2/TMP) of UO/sub 2/(HFA)/sub 2/ are also described.
- Research Organization:
- Australian Atomic Energy Commission Research Establishment, Sutherland
- OSTI ID:
- 6811368
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:20; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPLEXES
CARBON DIOXIDE LASERS
COMPLEXES
DIMERS
FLUIDS
GAS LASERS
GASES
INFRARED SPECTRA
LASER SPECTROSCOPY
LASERS
MOLECULAR STRUCTURE
MONOMERS
PRESSURE DEPENDENCE
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE
ULTRAVIOLET SPECTRA
URANIUM COMPLEXES
URANYL COMPLEXES
VISIBLE SPECTRA