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Title: Magnetic circular dichroism of UCl6– in the ligand-to-metal charge-transfer spectral region

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI: https://doi.org/10.1039/C7CP02572F · OSTI ID:1371674
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  1. Univ. at Buffalo, NY (United States). Dept. of Chemistry
  2. Univ. of Rochester, NY (United States). Dept. of Chemistry
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Toulouse (France). Lab. de Physique et de Chimie Quantiques
  5. Univ. of Rochester, NY (United States). Dept. of Chemistry

Here, we present a combined ab initio theoretical and experimental study of the magnetic circular dichroism (MCD) spectrum of the octahedral UCl6- complex ion in the UV-Vis spectral region. The ground state is an orbitally non-degenerate doublet E5/2u and the MCD is a $$C$$-term spectrum caused by spin–orbit coupling. Calculations of the electronic spectrum at various levels of theory indicate that differential dynamic electron correlation has a strong influence on the energies of the dipole-allowed transitions and the envelope of the MCD spectrum. The experimentally observed bands are assigned to dipole-allowed ligand-to-metal charge transfer into the 5f shell, and 5f to 6d transitions. Charge transfer excitations into the U 6d shell appear at much higher energies. The MCD-allowed transitions can be assigned via their signs of the $$C$$-terms: Under Oh double group symmetry, E5/2u → E5/2g transitions have negative $$C$$-terms whereas E5/2u → F3/2g transitions have positive $$C$$-terms if the ground state g-factor is negative, as it is the case for UCl6-.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC52-06NA25396; SC0001136; SC0016002
OSTI ID:
1371674
Report Number(s):
LA-UR-17-23360
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 26 Vol. 19; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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