Tungsten pentafluoride

Tungsten(V) fluoride
Names

IUPAC names Tungsten(V) fluoride Tungsten pentafluoride
Identifiers
CAS Number	19357-83-6^Y
3D model (JSmol)	Interactive image
ChemSpider	123939
PubChem CID	140522
CompTox Dashboard (EPA)	DTXSID70172965
InChI InChI=1S/5FH.W/h5*1H;/q;;;;;+5/p-5 Key: QHIRVZBLPRTQQO-UHFFFAOYSA-I
SMILES F[W](F)(F)(F)F
Properties
Chemical formula	F₅W
Molar mass	278.83 g·mol⁻¹
Appearance	yellow solid
Density	5.01 g/cm³
Melting point	66 °C (151 °F; 339 K)
Boiling point	215.6 °C (420.1 °F; 488.8 K)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	oxidizer, hydrolyzes to release HF
Flash point	Non-flammable
Related compounds
Related compounds	TaCl₅ NbCl₅ MoF₅
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(V) fluoride is an inorganic compound with the formula WF₅. It is a hygroscopic yellow solid. Like most pentafluorides, it adopts a tetrameric structure, consisting of [WF₅]₄ molecules. In this way, each W center achieves octahedral coordination.^[1]

Production

Tungsten(V) fluoride is produced by the reaction of tungsten and tungsten hexafluoride:^[2]

W + 5 WF₆ → 6 WF₅

At room temperature, it disproportionates to the tetra- and hexafluoride:

2 WF₅ → WF₄ + WF₆

References

^ Edwards, A. J. (1969). "Crystal Structure of tungsten pentafluoride". J. Chem. Soc. A: 909. doi:10.1039/J19690000909.
^ Schröder, Johann; Grewe, Franz J. (1970). "Darstellung und Eigenschaften von Wolframpentafluorid". Chemische Berichte. 103 (5): 1536–46. doi:10.1002/cber.19701030524.{{cite journal}}: CS1 maint: multiple names: authors list (link)