Tungsten(VI) oxytetrachloride

Tungsten(VI) oxytetrachloride
Names
	Other names Tungsten(IV) chloride oxide
Identifiers
CAS Number	13520-78-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	21171360;
ECHA InfoCard	100.033.497
EC Number	236-863-7;
PubChem CID	19596810;
	InChI InChI=1S/4ClH.O.W/h4*1H;;/q;;;;;+4/p-4 Key: LQNAFXBTXJHEAX-UHFFFAOYSA-J;
	SMILES O=[W](Cl)(Cl)(Cl)Cl;
Properties
Chemical formula	WOCl4
Molar mass	341.651 g/mol
Appearance	red crystals
Density	11.92 g/cm3
Melting point	211 °C (412 °F; 484 K)
Boiling point	227.55 °C (441.59 °F; 500.70 K)
Solubility in water	reacts
Solubility	soluble in benzene and CS2
Hazards
	GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Related compounds
Other anions	Tungsten(VI) oxytetrafluoride; Tungsten(VI) oxytetrabromide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Tungsten(VI) oxytetrachloride is the inorganic compound with the formula W O Cl₄. This diamagnetic solid is used to prepare other complexes of tungsten. The red crystalline compound is soluble in nonpolar solvents but it reacts with alcohols and water and forms adducts with Lewis bases.

Structure

Structure of solid WOCl₄, illustrating its polymeric structure with short W≡O and weak W---O bonds in the chains. Color code: O = red.

The solid consists of weakly associated square pyramidal monomers.[2] The compound is classified as an oxyhalide.

Synthesis and reactions

WOCl₄ is prepared from tungsten trioxide:[3]

WO₃ + 2 SOCl₂ → WOCl₄ + 2 SO₂

WCl₆ + (Me₃Si)₂O → WOCl₄ + 2 Me₃SiCl

WOCl₄ is Lewis acidic. It is a precursor to catalysts used for polymerization of alkynes.[4]

References

"Tungsten tetrachloride oxide". pubchem.ncbi.nlm.nih.gov. Retrieved 12 December 2021.
Hess, H.; Hartung, H. (1966). "Die Kristallstruktur von Wolframoxidchlorid WOCl₄ und Wolframoxidbromid WOBr₄". Z. Anorg. Allg. Chem. 34 (3–4): 157–166. doi:10.1002/zaac.19663440306.
Nielson, A. J. (2007). "Tungsten and Molybdenum Tetrachloride Oxides". Inorganic Syntheses. pp. 195–198. doi:10.1002/9780470132548.ch41. ISBN 9780470132548. {{cite book}}: |journal= ignored (help)
Hayano, S.; Masuda, T. (1999). "Living Polymerization of [o-(Trifluoromethyl)phenyl]acetylene by WOCl₄-Based Catalysts such as WOCl₄-n-Bu₄Sn-t-BuOH (1:1:1)". Macromolecules. 32: 7344–7348. doi:10.1002/zaac.19663440306.

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[1] "Tungsten tetrachloride oxide". pubchem.ncbi.nlm.nih.gov. Retrieved 12 December 2021.

[2] Hess, H.; Hartung, H. (1966). "Die Kristallstruktur von Wolframoxidchlorid WOCl₄ und Wolframoxidbromid WOBr₄". Z. Anorg. Allg. Chem. 34 (3–4): 157–166. doi:10.1002/zaac.19663440306.

[3] Nielson, A. J. (2007). "Tungsten and Molybdenum Tetrachloride Oxides". Inorganic Syntheses. pp. 195–198. doi:10.1002/9780470132548.ch41. ISBN 9780470132548. {{cite book}}: |journal= ignored (help)

[4] Hayano, S.; Masuda, T. (1999). "Living Polymerization of [o-(Trifluoromethyl)phenyl]acetylene by WOCl₄-Based Catalysts such as WOCl₄-n-Bu₄Sn-t-BuOH (1:1:1)". Macromolecules. 32: 7344–7348. doi:10.1002/zaac.19663440306.