9859. Uranium Trichloride

Nomenclature

CAS number: 10025-93-1
Cl3U; mol wt 344.39.
Cl 30.88%, U 69.12%.
UCl3.

Description and references

Prepd by hydrogen reduction of uranium(IV) chloride: Suttle, Inorg. Synth. 5, 145 (1957).

Properties

Dark purple crystals. Less hygroscopic than uranium(IV) chloride. d 5.51. mp 842°. Heat of formation at 25° 212.0 kcal/mol. Freely sol in water, giving a purple soln, which evolves hydrogen and turns green because of oxidation to uranium(IV). Less sol in polar organic solvents than uranium(IV) chloride and insol in nonpolar solvents.