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

Chemical compound

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]

References

^ ^a ^b ^c 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.