9857. Uranium Tetrachloride

Nomenclature

CAS number: 10026-10-5
Cl4U; mol wt 379.84.
Cl 37.33%, U 62.67%.
UCl4.

Description and references

Prepd from uranium(VI) oxide dihydrate and hexachloropropene: Hermann, Suttle, Inorg. Synth. 5, 143 (1957).

Properties

Dark green octahedral crystals (tetragonal symmetry). Oxidizes in air and dec on contact with water. Should be stored in sealed ampuls. d425 4.725. mp 590°, bp760 791°. Heat of formation (solid) 250.9 kcal/mol at 0°. Freely sol in water (dec). Also sol in polar organic solvents. Insol in nonpolar solvents such as hydrocarbons and ethyl ether.