|Molar mass 618.7423 g/mol|
Appearance black solid
|Density 6.78 g/cm³|
Uranium triiodide is an inorganic chemical compound consisting of the elements uranium and iodine. An iodide, it has the chemical formula UI3.
Uranium triiodide may be obtained from the direct reaction of its constituent elements:2 U + 3 I2 → 2 UI3
Uranium triiodide is a black solid that melts at 766 °C. It crystallizes in the orthorhombic crystal system (plutonium tribromide-type) in the space group Ccmm with the lattice parameters a = 432.8 pm, b = 1401.1 pm, and c = 1000.5 pm and four formula units per unit cell. Uranium triiodide is suitable as a Lewis acidic catalyst for various Diels-Alder reactions, which are carried out under mild conditions.