567. Ammonium Uranium Fluoride

Nomenclature

CAS number: 18433-40-4
Triammonium pentafluorodioxouranate; ammonium dioxopentafluorouranate(VI); uranium ammonium fluoride; uranyl ammonium fluoride.
F5H12N3O2U; mol wt 419.14.
F 22.66%, H 2.89%, N 10.03%, O 7.63%, U 56.79%.
UO2(NH4)3F5.

Description and references

Usually contains some water of crystallization. Prepn and crystal structure: Nguyen-Quy-Dao, Bull. Soc. Chim. Fr. 1968, 3543; idem, Acta Crystallogr. 25B, 67 (1969).

Properties

Greenish-yellow, monoclinic, cryst powder. Freely sol in water; practically insol in alcohol.

Use

Has been used in x-ray work because of its fluorescence under these rays.