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Tungsten(III) iodide
Names
	Other names Tungsten triiodide
Identifiers
CAS Number	15513-69-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	65321903;
PubChem CID	12010987;
CompTox Dashboard (EPA)	DTXSID101336910 ;
	InChI InChI=1S/3HI.W/h3*1H;/q;;;+3/p-3 Key: BHPNVJNBEDSWEE-UHFFFAOYSA-K;
	SMILES I[W](I)I;
Properties
Chemical formula	WI3
Molar mass	564.6
Appearance	Black solid
Solubility in water	Insoluble
Related compounds
Other anions	Tungsten(III) bromide; Tungsten(III) chloride
Other cations	Chromium(III) iodide; Molybdenum(III) iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tungsten(III) iodide or tungsten triiodide is a chemical compound of tungsten and iodine with the formula WI₃.

Preparation

Tungsten(III) iodide can be prepared by reducing tungsten hexacarbonyl with iodine.^[1]^[3]

\mathrm {2\ W(CO)_{6}+3\ I_{2}\longrightarrow 2\ WI_{3}+12\ CO}

Tungsten(III) iodide is a black solid that releases iodine at room temperature, and is less stable than molybdenum(III) iodide. It is soluble in acetone and nitrobenzene, and slightly soluble in chloroform.^[1]

It decomposes to form tungsten(II) iodide:^[1]

\mathrm {6WI_{3}\longrightarrow [W_{6}I_{8}]I_{4}+3I_{2}}

^ ^a ^b ^c ^d Brauer, Georg; Baudler, Marianne (1981). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. ISBN 3-432-02328-6.
^ Lide, David R. (2004-06-29). CRC Handbook of Chemistry and Physics, 85th Edition. CRC Press.
^ Ströbele, Markus; Meyer, Hans-Jürgen (2019). "Pandora's box of binary tungsten iodides". Dalton Transactions. 48 (5): 1547–1561. doi:10.1039/C8DT04004D. PMID 30574976. S2CID 58651255.