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Tungsten(VI) oxytetrachloride

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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.^{[citation needed]}

Tungsten(VI) oxytetrachloride
Names


Other names Tungsten(IV) chloride oxide
Identifiers
CAS Number	13520-78-0^Y
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). Y verify (what is ^YN ?) Infobox references

Structure

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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

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WOCl₄ is prepared from tungsten trioxide:^[3]

WO₃ + 2 SOCl₂ → WOCl₄ + 2 SO₂

WCl₆ + (Me₃Si)₂O → WOCl₄ + 2 Me₃SiCl

It is "difficult to prepare by other means."^[4]

WOCl₄ is Lewis acidic. It is a precursor to catalysts used for polymerization of alkynes.^[5]

References

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^ "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". Inorg. Synth. 23: 195–198. doi:10.1002/9780470132548.ch41. ISBN 9780470132548.

^ Audrieth, Ludwig F.; Kleinberg, Jacob (1953). Non-aqueous solvents. New York: John Wiley & Sons. p. 224. LCCN 52-12057.

^ 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.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Tungsten(VI)_oxytetrachloride&oldid=1232369867" Last edited on 3 July 2024, at 11:51

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