# Tungsten(IV) chloride

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Names Identifiers Other names tungsten tetrachloride 3D model (JSmol) ChemSpider ECHA InfoCard 100.157.353 EC Number 629-145-3 PubChem CID CompTox Dashboard (EPA) Key: YOUIDGQAIILFBW-UHFFFAOYSA-JInChI=1S/4ClH.W/h4*1H;/q;;;;+4/p-4 Cl[W](Cl)(Cl)Cl Cl4W Molar mass 325.65 g·mol−1 Appearance black solid Density 4.62 g·cm−3 Melting point 450 °C (842 °F; 723 K) GHS pictograms GHS Signal word Danger H302, H314, H318 P260, P264, P270, P280, P301+312, P301+330+331, P303+361+353, P304+340, P305+351+338, P310, P321, P330, P363, P405, P501 Other anions Tungsten(IV) fluoride Related compounds Tungsten(V) chloride Tungsten hexachloride Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tungsten(IV) chloride is an inorganic compound with the formula WCl4. It is a diamagnetic black solid. The compound is of interest in research as one of a handful of binary tungsten chlorides.

## Structure and preparation

WCl4 is usually prepared by reduction tungsten hexachloride. Many reductants have been reported, including red phosphorus, tungsten hexacarbonyl, gallium, tin, and antimony. The latter is reported to be optimal: [1]

${\displaystyle \mathrm {3\ WCl_{6}+2\ Sb\longrightarrow 3\ WCl_{4}+2\ SbCl_{3}} }$

Like most binary metal halides, WCl4 is polymeric. It consists of linear chains of tungsten atoms each in octahedral geometry. Of six chloride ligands attached to each W center, four are bridging ligands. The W-W separations are alternatingly bonding (2.688 Å) and nonbonding (3.787 Å).

## Reactions

Reduction of tungsten(IV) chloride with sodium yields the ditungsten(III) heptachloride derivative: [2]

2 WCl4 + 5 thf + 2 Na → [Na(thf)3][W2Cl7(thf)2] + NaCl

## Related Research Articles

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## References

1. Zhou, Yibo; Kolesnichenko, Vladimir; Messerle, Louis (2014). "Crystalline and Amorphous Forms of Tungsten Tetrachloride". Inorganic Syntheses: Volume 36. Inorganic Syntheses. 36. pp. 30–34. doi:10.1002/9781118744994.ch6. ISBN   9781118744994.
2. Broderick, Erin M.; Browne, Samuel C.; Johnson, Marc J. A. (2014). Dimolybdenum and Ditungsten Hexa(Alkoxides). Inorganic Syntheses. 36. pp. 95–102. doi:10.1002/9781118744994.ch18. ISBN   9781118744994.