Tungsten(IV) fluoride

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]

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

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]