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X-ray photoelectron spectroscopic study of uranium compounds

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic00231a002· OSTI ID:5658001
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The gas-phase X-ray photoelectron spectra of UF/sub 6/, U(BH/sub 4/)/sub 4/, U(BH/sub 3/CH/sub 3/)/sub 4/, and U(C/sub 8/H/sub 8/)/sub 2/ have been obtained. The core binding energy data show that the bonding in UF/sub 6/ is extraordinarily ionic and that the bonding in the other compounds, especially U(C/sub 8/H/sub 8/)/sub 2/, is considerably more covalent. The binding energies and shake-up spectra show that the covalencies of U(BH/sub 4/)/sub 3/ and U(BH/sub 3/CH/sub 3/)/sub 4/ are comparable to that of UBr/sub 4/, with U(BH/sub 3/CH/sub 3/)/sub 4/ being more covalent than U(BH/sub 4/)/sub 4/. By consideration of both core binding energies and literature valence ionization potentials, it is shown that the HOMO of UF/sub 6/ is the t/sub 1g/ fluorine lone-pair orbital. A similar analysis of data for U(BH/sub 4/)/sub 4/ U(BH/sub 3/CH/sub 3/)/sub 4/, and U(C/sub 8/H/sub 8/)/sub 2/ is consistent with spectral features that suggest the uranium 5f electrons in these compounds are essentially nonbonding.

Research Organization:
Univ. of California, Berkeley
DOE Contract Number:
AC03-76SF00098
OSTI ID:
5658001
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 25:11; ISSN INOCA
Country of Publication:
United States
Language:
English

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ACTINIDE COMPOUNDS
ALKANES
BINDING ENERGY
BORON COMPOUNDS
CHEMICAL BONDS
COVALENCE
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY
EXPERIMENTAL DATA
FLUIDS
FLUORINE COMPOUNDS
GASES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
IONIZATION POTENTIAL
IONIZING RADIATIONS
MOLECULAR STRUCTURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
RADIATIONS
SPECTROSCOPY
URANIUM COMPOUNDS
VALENCE
X RADIATION