Uranium(III) iodide Identifiers ChemSpider ECHA InfoCard 100.033.992 EC Number InChI=1S/3HI.U/h3*1H;/q;;;+3/p-3
Key: CDQDFXDBVYMPJX-UHFFFAOYSA-K
Properties UI3 Molar mass 618.74232 g/mol Appearance black solid Density 6.78 g/cm3 [ 1] Melting point 766[ 2] Structure orthorhombic Ccmm, No. 63 a = 432.8 pm,b = 1401.1 pm,c = 1000.5 pm
4 Hazards GHS labellingDanger H300, H330, H373, H411 Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
Chemical compound
Uranium triiodide is aninorganic compound with thechemical formula UI3 . It is a black solid that is soluble in water.
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 intetrahydrofuran (THF), the product is the blue complex UI3 (THF)4 .[ 4]
It crystallizes in theorthorhombic crystal system (plutonium tribromide -type) in thespace group Ccmm with thelattice parameters a = 432.8 pm,b = 1401.1 pm, andc = 1000.5 pm and fourformula units perunit cell .[ 1]
Uranium triiodide can be used as aLewis acid catalyst for variousDiels-Alder reactions carried out under mild conditions.[ 5]
^a b Levy, J. H.; Taylor, J. C.; Wilson, P. W. (1975-03-01)."The structure of uranium(III) triiodide by neutron diffraction" Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry .31 (3):880– 882.Bibcode :1975AcCrB..31..880L .doi :10.1107/S0567740875003986 ISSN 0567-7408 . ^ Arnold F. Holleman, Nils Wiberg:Lehrbuch der Anorganischen Chemie , 102. Auflage, de Gruyter, Berlin 2007,ISBN 978-3-11-017770-1 ^ Handbuch der präparativen anorganischen Chemie. 2 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1978.ISBN 978-3-432-87813-3 ^ David L. Clark; Alfred P. Sattelberger (1996). "Lewis Base Adducts of Uranium Triiodide and Tris[Bis(Trimethylsilyl)Amido]Uranium".Inorganic Syntheses . Inorganic Synththesis. Vol. 31. pp. 307– 315.doi :10.1002/9780470132623.ch55 .ISBN 978-0-470-13262-3 ^ Collin, Jacqueline; Maria, Leonor; Santos, Isabel (Oct 2000)."Uranium iodides as catalysts for Diels–Alder reactions" Journal of Molecular Catalysis A: Chemical .160 (2):263– 267.doi :10.1016/S1381-1169(00)00257-0 .
U(II) U(III)
U(IV) Organouranium(IV) compounds
U(IV,V) U(V) U(V,VI) U(VI)
U(XII)
Salts and covalent derivatives of the
iodide ion
