Vanadium(V) fluoride
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| Names | |
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IUPAC name
Vanadium(V) fluoride
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| Other names
Vanadium pentafluoride
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| Identifiers | |
| ECHA InfoCard | 100.029.112 |
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PubChem CID
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| Properties | |
| VF5 | |
| Molar mass | 145.934 |
| Appearance | colorless solid |
| Density | 2.502 g/cm3 (solid) |
| Melting point | 19.5 °C (67.1 °F; 292.6 K) |
| Boiling point | 48.3 °C (118.9 °F; 321.4 K) |
| Related compounds | |
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Other cations
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Niobium(V) fluoride Tantalum(V) fluoride |
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Related Vanadium compounds
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Vanadium(V) oxide Vanadium trifluoride |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Vanadium(V) fluoride is the inorganic compound with the chemical formula VF5. It is a colorless volatile liquid. It is a highly reactive compound, as indicated by its ability to fluorinate organic substances .
The compound is exclusively a monomer in the gas phase. In the gas phase it adopts D3h symmetric trigonal bipyramidal geometry as indicated by electron diffraction. As a solid, VF5 forms a polymeric structure with fluoride-bridged octahedral vanadium centers.
The formation enthalpy of VF5 is -1429.4 ± 0.8 kJ/mol.
It is the only known pentahalide of vanadium.
Vanadium pentafluoride can be prepared by fluorination of vanadium metal:
Alternatively, disproportionation of vanadium tetrafluoride yields equal amounts of the solid trifluoride and the volatile pentafluoride:
This conversion is conducted at 650 °C. It can also be synthesized by using elemental fluorine to fluorinate industrial concentrates and raw materials so as to produce VF5 on an industrial scale. VF5 can be synthesized from the reaction of raw materials such as metallic Vanadium, ferrovanadium, vanadium (V) oxide and vanadium tetrafluoride with elemental fluorine.
VF5 ionises in the liquid state as reflected by the high values of Trouton’s constant and electrical conductivities.
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