Uranium(III) iodide

Uranium(III) iodide
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Identifiers
CAS Number	13775-18-3
Properties
Chemical formula	UI3
Molar mass	618.74232 g/mol
Appearance	black solid
Density	6.78 g/cm3
Melting point	766 °C (1,411 °F; 1,039 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Uranium triiodide is an inorganic chemical compound consisting of the elements uranium and iodine. An iodide, it has the chemical formula UI₃.

Production

Uranium triiodide may be obtained from the direct reaction of its constituent elements:^[2]

2 U + 3 I₂ → 2 UI₃

Uranium triiodide is a black solid that melts at 766 °C.^[3] 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.^[1] Uranium triiodide is suitable as a Lewis acidic catalyst for various Diels-Alder reactions, which are carried out under mild conditions.^[4]

↑ ^1.0 ^1.1 J. H. Levy, J. C. Taylor, P. W. Wilson: "The Structure of Uranium(III) Triiodide by Neutron Diffraction", in: Acta Crystallogr. B, 1975, 31, S. 880–882 (doi:10.1107/S0567740875003986).
↑ Georg Brauer (ed.): Handbuch der Präparativen Anorganischen Chemie. 3rd edition. Vol. 2, Enke, Stuttgart 1978, ISBN 3-432-87813-3, p. 1218.
↑ Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1, S. 1969.
↑ Jacqueline Collin, Leonor Maria, Isabel Santos: "Uranium Iodides as Catalysts for Diels–Alder Reactions", in: Journal of Molecular Catalysis A: Chemical, 2000, 160 (2), pp. 263–267 (doi:10.1016/S1381-1169(00)00257-0).

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