Uranium(IV) iodide

Uranium(IV) iodide
	; __ U4+ __ I−
Identifiers
CAS Number	13470-22-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	75343;
ECHA InfoCard	100.033.381
EC Number	236-735-0;
PubChem CID	83508;
CompTox Dashboard (EPA)	DTXSID9065497 ;
	InChI InChI=1S/4HI.U/h4*1H;/q;;;;+4/p-4 Key: PUBUIOWBJCONDZ-UHFFFAOYSA-J;
	SMILES I[U](I)(I)I;
Properties
Chemical formula	UI4
Molar mass	745.647 g/mol
Appearance	black hygroscopic crystals
Structure
Crystal structure	monoclinic
Space group	C2/c, No. 15
Lattice constant	a = 1396.7 pm, b = 847.2 pm, c = 751 pm α = 90°, β = 90.54°, γ = 90°
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Radioactive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H330, H373, H411
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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[edit]

Uranium tetraiodide can be prepared from the reaction between uranium and an excess of iodine.^[2]

Properties[edit]

Uranium tetraiodide is a black solid and forms needle-like crystals. Upon heating, it dissociates into uranium triiodide and iodine gas.^[2] It crystallizes in the monoclinic crystal system, space group C2/c.^[1]

References[edit]

^ ^a ^b Levy, J. H.; Taylor, J. C.; Waugh, A. B. (1980). "Crystal structure of uranium(IV) tetraiodide by x-ray and neutron diffraction". Inorganic Chemistry. 19 (3): 672–674. doi:10.1021/ic50205a019. ISSN 0020-1669.
^ ^a ^b Brauer, Georg (1978). Handbuch der Präparativen Anorganischen Chemie. Vol. II (3rd ed.). Stuttgart: Ferdinand Enke. p. 1218. ISBN 3-432-87813-3.

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[Levy-1] Levy, J. H.; Taylor, J. C.; Waugh, A. B. (1980). "Crystal structure of uranium(IV) tetraiodide by x-ray and neutron diffraction". Inorganic Chemistry. 19 (3): 672–674. doi:10.1021/ic50205a019. ISSN 0020-1669.

[Brauer-2] Brauer, Georg (1978). Handbuch der Präparativen Anorganischen Chemie. Vol. II (3rd ed.). Stuttgart: Ferdinand Enke. p. 1218. ISBN 3-432-87813-3.

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