Uranium triiodide

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Uranium triiodide
Kristallstruktur Plutonium(III)-bromid.png
Identifiers
CAS number 13775-18-3
Properties
Molecular formula UI3
Molar mass 618.74232 g/mol
Appearance black solid
Density 6.78 g/cm3[1]
Melting point 766 °C
Except where noted otherwise, 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[edit]

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

2 U + 3 I2 → 2 UI3

Properties[edit]

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]

References[edit]

  1. ^ a b J. H. Levy, J. C. Taylor, P. W. Wilson: "The Structure of Uranium(III) Triiodide by Neutron Diffraction", in: Acta Cryst. B, 1975, 31, S. 880–882 (doi:10.1107/S0567740875003986).
  2. ^ Georg Brauer (ed.): Handbuch der Präparativen Anorganischen Chemie. 3rd edition. Vol. 2, Enke, Stuttgart 1978, ISBN 3-432-87813-3, p. 1218.
  3. ^ Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1, S. 1969.
  4. ^ 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).