Tungsten(IV) fluoride

Tungsten(IV) fluoride
Names
	IUPAC name tetrafluorotungsten
	Other names Tungsten(4+) tetrafluoride, Tungsten tetrafluoride
Identifiers
CAS Number	13766-47-7;
3D model (JSmol)	Interactive image;
ChemSpider	123101;
EC Number	232-029-1;
PubChem CID	139582;
CompTox Dashboard (EPA)	DTXSID10160260 ;
	InChI InChI=1S/4FH.W/h4*1H;/q;;;;+4/p-4;
	SMILES F[W](F)(F)F;
Properties
Chemical formula	WF4
Molar mass	259.8336128 g/mol
Appearance	Red-Brown or Black Solid[1]
Related compounds
Other anions	Tungsten(IV) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Tungsten tetrafluoride is an inorganic compound with the formula WF₄. This little studied solid has been invoked, together with tungsten pentafluoride, as an intermediate in the chemical vapor deposition of tungsten films using tungsten hexafluoride.[2]

Structure

Tungsten tetrafluoride was found to have polymeric structure based on Mössbauer spectroscopy.[3]

Preparation

It has been prepared by treatment of the coordination complex WCl₄(MeCN)₂ with AsF₃.[4] It has been produced by from the reaction of WF₆ and a W filament at 600-800 °C.[1]

Reactions

The compound can be re-oxidized to W(VI) compounds by treatment with fluorine and chlorine:

WF₄ + X₂ → WF₄X₂

Upon heating, it disproportionates to WF₆ and tungsten metal.[1]

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References

Butskii, V. D.; Perov, V. S. (1977). "Synthesis and certain properties of tungsten tetrafluoride". Zhurnal Neorganicheskoi Khimii. 22 (1): 14–17.
Creighton, J. R. (1989). "Selectivity loss during tungsten chemical vapor deposition: The role of tungsten pentafluoride". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 7 (3): 621–624. Bibcode:1989JVSTA...7..621C. doi:10.1116/1.575854.
Dzhevitskij, B. Eh; Savvateev, N. N.; Butskij, V. D.; Fal'Kengof, A. T.; Novotortsev, V. M.; Rakitin, Yu V.; Pervov, V. S. (1980). "Moessbauer spectrum and magnetic properties of tungsten tetrafluoride". Zhurnal Neorganicheskoj Khimii. 25 (9): 2327–2329.
Meinert, Hasso; Dimitrov, A. "On the chemistry of tungsten tetrafluoride" Zeitschrift für Chemie (1976), 16(1), 29-30.

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[Source3-1] Butskii, V. D.; Perov, V. S. (1977). "Synthesis and certain properties of tungsten tetrafluoride". Zhurnal Neorganicheskoi Khimii. 22 (1): 14–17.

[2] Creighton, J. R. (1989). "Selectivity loss during tungsten chemical vapor deposition: The role of tungsten pentafluoride". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 7 (3): 621–624. Bibcode:1989JVSTA...7..621C. doi:10.1116/1.575854.

[3] Dzhevitskij, B. Eh; Savvateev, N. N.; Butskij, V. D.; Fal'Kengof, A. T.; Novotortsev, V. M.; Rakitin, Yu V.; Pervov, V. S. (1980). "Moessbauer spectrum and magnetic properties of tungsten tetrafluoride". Zhurnal Neorganicheskoj Khimii. 25 (9): 2327–2329.

[4] Meinert, Hasso; Dimitrov, A. "On the chemistry of tungsten tetrafluoride" Zeitschrift für Chemie (1976), 16(1), 29-30.