Uranium(III) iodide

Uranium(III) iodide
Identifiers
ECHA InfoCard 100.033.992
Properties
UI3
Molar mass 618.74232 g/mol
Appearance black solid
Density 6.78 g/cm3[1]
Melting point 766[2] °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 compound with the chemical formula UI3. It is a black solid.

Production

Uranium triiodide can be obtained from the direct reaction of its constituent elements:[3]

2 U + 3 I2 → 2 UI3

When the reaction is conducted in tetrahydrofuran (thf), the product is the blue UI3(thf)4.[4]

Properties

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 Lewis acidic.[5]

References

  1. 1 2 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).
  2. ↑ Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1, S. 1969.
  3. ↑ Georg Brauer (ed.): Handbuch der Präparativen Anorganischen Chemie. 3rd edition. Vol. 2, Enke, Stuttgart 1978, ISBN 3-432-87813-3, p. 1218.
  4. ↑ David L. Clark, Alfred P. Sattelberger (1997). "Lewis Base Adducts of Uranium Triiodide and Tris[Bis(Trimethylsilyl)Amido]Uranium". Inorg. Synth. 31: 307–315. doi:10.1002/9780470132623.ch55.
  5. ↑ 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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