View source for Uranium(IV) iodide

{{Chembox
| ImageFile = UI4.png
| ImageCaption = <span style="color:#C0C0C0; background:#C0C0C0;">__</span> [[Uran|U]]<sup>4+</sup>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="color:#FF00FF;background:#FF00FF;">__</span> [[Iodine|I]]<sup>−</sup>
| ImageSize =
| Section1 = {{Chembox Identifiers
| CASNo = 13470-22-9
| CASNo_Ref = {{Cascite|correct|CAS}}
| ChemSpiderID = 75343
| EC_number = 236-735-0
| PubChem = 83508
| SMILES = I[U](I)(I)I
| StdInChI=1S/4HI.U/h4*1H;/q;;;;+4/p-4
| StdInChIKey = PUBUIOWBJCONDZ-UHFFFAOYSA-J
  }}
| Section2 = {{Chembox Properties
| Formula = UI<sub>4</sub>
| MolarMass = 745.647 g/mol
| Appearance = black hygroscopic crystals}}
| Section3 = {{Chembox Structure
| Structure_ref = <ref name="Levy"/>
| CrystalStruct = monoclinic
| SpaceGroup = C2/c, No. 15
| LattConst_a = 1396.7 pm
| LattConst_b = 847.2 pm
| LattConst_c = 751 pm
| LattConst_beta = 90.54
}}
| Section4 = {{Chembox Hazards
| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|300|330|373|411}}
| PPhrases = {{P-phrases|}}
| MainHazards = Radioactive
}}
}}

'''Uranium(IV) iodide''', also known as '''uranium tetraiodide''', is an [[inorganic]] [[chemical compound]]. It is a salt of [[uranium]] in [[oxidation state]] +4 and iodine.

== Preparation ==
Uranium tetraiodide can be prepared from the reaction between uranium and an excess of iodine.<ref name="Brauer">{{cite book|first=Georg|last=Brauer|title=Handbuch der Präparativen Anorganischen Chemie|edition=3rd|volume=II|publisher=Ferdinand Enke|location=Stuttgart|year=1978|isbn=3-432-87813-3|page=1218}}</ref>

== Properties ==
Uranium tetraiodide is a black solid and forms needle-like crystals. Upon heating, it dissociates into [[uranium triiodide]] and iodine gas.<ref name="Brauer"/> It crystallizes in the monoclinic crystal system, space group C2/c.<ref name="Levy">{{Cite journal|last1=Levy|first1=J. H.|last2=Taylor|first2=J. C.|last3=Waugh|first3=A. B.|date=1980|title=Crystal structure of uranium(IV) tetraiodide by x-ray and neutron diffraction|journal=Inorganic Chemistry|language=en|volume=19|issue=3|pages=672–674|doi=10.1021/ic50205a019|issn=0020-1669}}</ref>

== References ==
{{reflist}}

{{Uranium compounds}}
{{Iodides}}
{{Actinide halides}}

[[Category:Uranium(IV) compounds]]
[[Category:Iodides]]
[[Category:Actinide halides]]

{{Inorganic-compound-stub}}