Tungsten pentafluoride

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]

Tungsten(V) fluoride

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

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