Chemistry:Tungsten(III) iodide

Tungsten(III) iodide
Names
	Other names Tungsten triiodide
Identifiers
CAS Number	15513-69-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	65321903;
PubChem CID	12010987;
	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
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]^[2]

2 W (C O)_{6} + 3 I_{2} ⟶ 2 W I_{3} + 12 C O

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]

6 W I_{3} ⟶ [W_{6} I_{8}] I_{4} + 3 I_{2}

↑ ^1.0 ^1.1 ^1.2 ^1.3 Brauer, Georg; Baudler, Marianne (1981). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. ISBN 3-432-02328-6.
↑ 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.

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