17275-65-9Relevant academic research and scientific papers
Fluoride complexes of pentavalent uranium
Penneman,Sturgeon,Asprey
, p. 126 - 129 (1964)
Solid fluoride complexes of pentavalent uranium are formed by heating UF5 with ammonium or alkali fluorides under anhydrous conditions. A series of complexes having MF:UF5 ratios (M = NH4, Li, Na, K, Rb, and Cs) of 1:1, 2:1 (except Li and Na), and 3:1 (except Li) were characterized by X-ray powder diffraction. These white to pale blue compounds exhibit characteristic absorption in the 1.3 to 1.5 μ region.
Synthesis and crystallographic properties of single crystals of alkali uranium(V) fluoride complexes
Sturgeon, George D.,Penneman,Kruse,Asprey
, p. 748 - 750 (2008/10/08)
Single crystals of fluoride complexes containing pentavalent uranium and an alkali (or ammonium) fluoride have been prepared, utilizing anhydrous hydrofluoric acid as a solvent. Finely divided UF5 is mixed with the desired fluoride, MF (M = Li, Na, K, Rb, Cs, or NH4), and treated with anhydrous liquid HF. The resulting blue solutions yield euhedral crystals of MUF6 compounds which are suitable for single-crystal X-ray analysis and optical crystallographic measurements. Dimorphism is found with NaUF6; it crystallizes in a face-centered cubic form, isostructural with NaUF6, and in a new form which is isostructural with rhombohedral LiUF6. Cell dimensions for rhombohedral NaUF6 are: a0 = 6.101 ± 0.005 A?., α = 54° 37′. Rhombohedral LiUF6, NaUF6, and CsUF6 are blue, optically uniaxial, and have characteristic group absorption spectra at 1.36 μ; KUF6, NH4UF6, and RbUF6 are pale yellow-green, optically biaxial, exhibit pseudo-hexagonal X-ray symmetry, and belong to a different spectral class, absorbing at 1.42 μ.
