Uranyl fluoride
chemical compound
Uranyl fluoride is the inorganic compound with the formula UO2F2. It is most notable as a contaminant in the production of uranium tetrafluoride.
As shown by X-ray crystallography, the uranyl centers UO2+2 are surrounded by six fluoride ligands F−.
Synthesis
It is formed in the hydrolysis of uranium hexafluoride (UF6):
UF6 + 2 H2O → UO2F2 + 4 HF
It can also be formed in the hydrofluorination of uranium trioxide (UO3):
UO3 + 2 HF → UO2F2 + H2O
Physical properties
This salt is very soluble in water as well as hygroscopic. It changes in color from brilliant orange to yellow upon hydration. Starting around 300 °C, hydrolysis by the water vapor in air becomes significant, resulting in HF fumes.
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