Uranium III Chloride

Submitted by John F. Suttle Checked by Henry R. HoEKSTRAf 

Uranium(III) chloride has been prepared by treating uranium hydride or uranium metal with hydrogen chloride 

or with a metal such as zinc.1 Detailed information on these procedures is summarized by Katz and Rabinowitch.1 Hydrogen reduction is convenient and yields a pure product. 

Uranium(III) chloride, as obtained by this procedure, is a dark purple, crystalline compound. Other procedures may yield products with varying colors. Uranium(III) chloride has a hexagonal lattice and is isomorphous with cerium(III) chloride and lanthanum bromide. The compound melts at 842° and has a density of 5.51. The vapor pressure (600 to 1000°) is given by the expression 

National Nuclear Energy Series, Div. VII, Vol. 5, Part 8, pp. 450-461, McGraw-Hill Book Company, Inc., New York, 1951. 

---

IV) chloride and is insoluble in nonpolar solvents. In many of its physical and chemical properties, uranium(III) chloride resembles the lanthanon(III) chlorides. 

Aquopentammine- and acido-pentamminechromium(III) salts, synthesis 36 Tripotassium enneachloroditung-state(III), synthesis 38 Uranium(IV) chloride, synthesis 39 Uranium(III) chloride, synthesis 40 Uranyl chloride, synthesis 41 Iron(II) chloride 2-hydrate, synthesis 48... 

U(C204)[Pg.264]

---