9862. Uranyl Chloride

Nomenclature

CAS number: 7791-26-6
Uranium dioxydichloride.
Cl2O2U; mol wt 340.93.
Cl 20.80%, O 9.39%, U 69.82%.
UO2Cl2.

Description and references

Prepd by the reaction of O2 with uranium(IV) chloride at 300-350°: Leary, Suttle, Inorg. Synth. 5, 148 (1957).

Properties

Bright yellow crystals. Orthorhombic system. Very hygroscopic. Appreciably volatile above 775°. Dec in vacuo above 450° yielding chlorine and UO2 plus U3O8. Very freely sol in water. Forms cryst hydrates. Sol in polar organic solvents such as acetone and alcohol, but insol in less polar solvents such as benzene. Aq solns are unstable.