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Synthesis and characterization of a new uranium(V) compound: H/sub 3/O/sup +/UF/sub 6//sup -/

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic50164a042· OSTI ID:7234442
The reaction of equimolar amounts of UF/sub 5/ and H/sub 2/O in hydrogen fluoride results in the partial dissolution of UF/sub 5/, yielding a blue-green solution from which the new salt oxonium hexafluorouranate(V)(H/sub 3/O/sup +/UF/sub 6//sup -/) could be isolated as a green crystalline solid. Calorimetric measurements showed H/sub 3/O/sup +/UF/sub 6//sup -/ to decompose at about 68/sup 0/C and its heat of formation to be equal to -628 +- 2 kcal mol. Its ionic nature in the solid state and in HF solutions was demonstrated from vibrational and electronic spectra. The electronic spectrum is closely similar to those of LiUF/sub 6/, NaUF/sub 6/, and CsUF/sub 6/ and differs from those of RbUF/sub 6/ and KUF/sub 6/. This adduct shows a strong ESR signal, with g = -0.78 +- 0.10, characteristic of UF/sub 6//sup -/ salts. Based on its x-ray powder diffraction pattern, H/sub 3/O/sup +/UF/sub 6//sup -/ is cubic with a = 5.2229 +- 0.0005 A.
Research Organization:
CEN de Saclay, Gif-sur-Yvette, France
OSTI ID:
7234442
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 15:10; ISSN INOCA
Country of Publication:
United States
Language:
English