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[1] °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.[2] 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:[3]

9 WCl₆ + 8 Bi → 3 W₃Cl₁₀ + 8 BiCl₃

References

Eliseev, S. S.; Synthesis and physicochemical properties of tungsten trichloride. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy 1983, V19(7), P1182-5 CAPLUS
Yue‐Qing Zheng, Ekaterina Jonas, Jürgen Nuss, Hans Georg von Schnering (1999). "The DMSO Solvated octahedro‐[W₆iCl₁₂aCl₆ Cluster Molecule". Z. anorg. allg. Chem. 624: 1400–1404. doi:10.1002/(SICI)1521-3749(199809)624:9<1400::AID-ZAAC1400>3.0.CO;2-0.CS1 maint: uses authors parameter (link)
Thurston, J. H.; Kolesnichenko, V.; Messerle, L. (2014). "Trinuclear tungsten halide clusters". Inorg. Synth. 36: 24–30. doi:10.1002/9781118744994.ch5.CS1 maint: uses authors parameter (link)

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[1] Eliseev, S. S.; Synthesis and physicochemical properties of tungsten trichloride. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy 1983, V19(7), P1182-5 CAPLUS

[2] Yue‐Qing Zheng, Ekaterina Jonas, Jürgen Nuss, Hans Georg von Schnering (1999). "The DMSO Solvated octahedro‐[W₆iCl₁₂aCl₆ Cluster Molecule". Z. anorg. allg. Chem. 624: 1400–1404. doi:10.1002/(SICI)1521-3749(199809)624:9<1400::AID-ZAAC1400>3.0.CO;2-0.CS1 maint: uses authors parameter (link)

[3] Thurston, J. H.; Kolesnichenko, V.; Messerle, L. (2014). "Trinuclear tungsten halide clusters". Inorg. Synth. 36: 24–30. doi:10.1002/9781118744994.ch5.CS1 maint: uses authors parameter (link)