Reactions of laser-ablated uranium atoms with H2O in excess argon: A matrix infrared and relativistic DFT investigation of uranium oxyhydrides

Binyong Liang, Rodney D. Hunt, Gary P. Kushto, Lester Andrews, Jun Li, Bruce E. Bursten

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Laser-ablated U atoms react with H2O during condensation in excess argon. Infrared absorptions at 1416.3, 1377.1, and 859.4 cm-1 are assigned to symmetric H-U-H, antisymmetric H-U-H, and U=O stretching vibrations of the primary reaction product H2UO. Uranium monoxide, UO, also formed in the reaction, inserts into H2O to produce HUO(OH), which absorbs at 1370.5, 834.3, and 575.7 cm-1. The HUO(OH) uranium(IV) product undergoes ultraviolet photoisomerization to a more stable H2UO2 uranium(VI) molecule, which absorbs at 1406.4 and 885.9 cm-1. Several of these species, particularly H 2UO2, appear to form weak Ar-coordinated complexes. The predicted vibrational frequencies, relative absorption intensities, and isotopic shifts from relativistic DFT calculations are in good agreement with observed spectra, which further supports the identification of novel uranium oxyhydrides from matrix infrared spectra.

Original languageEnglish
Pages (from-to)2159-2168
Number of pages10
JournalInorganic Chemistry
Volume44
Issue number7
DOIs
StatePublished - Apr 7 2005

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