Tungsten(III) chloride

Tungsten(III) chloride
Identifiers
CAS Number	12371-22-1 ;
3D model (JSmol)	Interactive image;
PubChem CID	5251191;
CompTox Dashboard (EPA)	DTXSID50413323 ;
	InChI InChI=1S/3ClH.W/h3*1H;/q;;;+3/p-3 Key: KBSJJSOGQSGFRD-UHFFFAOYSA-K;
	SMILES Cl[W](Cl)Cl;
Properties
Chemical formula	Cl18W6
Molar mass	1741.14 g·mol−1
Appearance	yellow brown solid
Density	5.44 g·cm−3
Melting point	550 °C (1,022 °F; 823 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tungsten(III) chloride is the inorganic compound with the formula W₆Cl₁₈. It is a cluster compound. It is a brown solid, obtainable by chlorination of tungsten(II) chloride. Featuring twelve doubly bridging chloride ligands, the cluster adopts a structure related to the corresponding chlorides of niobium and tantalum. In contrast, W₆Cl₁₂ features eight triply bridging chlorides.

A related mixed valence W(III)-W(IV) chloride is prepared by reduction of the hexachloride with bismuth:

9 WCl₆ + 8 Bi → 3 W₃Cl₁₀ + 8 BiCl₃

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