Vanadium pentafluoride

Vanadium(V) fluoride
IUPAC name Vanadium(V) fluoride
Other names Vanadium pentafluoride
Identifiers
CAS number	7783-72-4
PubChem	165641
Properties
Molecular formula	VF5
Molar mass	145.934
Appearance	colorless solid
Density	2.502 g/cm3 (solid)
Melting point	19.5 °C
Boiling point	48.3 °C
Related compounds
Other cations	Niobium(V) fluoride Tantalum(V) fluoride
Related Vanadium compounds	Vanadium(V) oxide
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Vanadium(V) fluoride is an inorganic compound with the chemical formula VF₅, and is the only pentahalide of vanadium.

Synthesis

It can be prepared by these reactions below:

$\rm \ V + 5F_2 \xrightarrow{300C} VF_5$

$\rm \ VF_4 \xrightarrow{873K,N_2} VF_3 + VF_5$

Characteristics

• Vanadium(V) fluoride is an extremely strong fluorinating agent, which is capable of corroding glass at room temperature:

$\rm \ 4VF_5 + 5SiO_2 \rightarrow 2V_2O_5 + 5SiF_4$

• Reacting with water in air:

$\mathrm{VF_5 + H_2O \ \xrightarrow{}\ VOF_3 + 2HF }$

• Treated with water:

$\mathrm{2VF_5 + 5H_2O \ \xrightarrow{}\ V_2O_5\downarrow + 10HF }$

• Reacting with water at 0°C, producing hydrogen fluoride and H[V(OH)₂F₄]:

$\mathrm{VF_5 + 2H_2O \ \xrightarrow{0^oC}\ H[V(OH)_2F_4] + HF }$

• Reacting with sodium hydroxide:

$\mathrm{2VF_5 + 10NaOH \ \xrightarrow{}\ V_2O_5\downarrow + 10HF + 5H_2O }$

• Combining with some fluorides to form a complex:

$\mathrm{VF_5 + KF \ \xrightarrow{}\ K[VF_6] }$

References

• Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, S. 1545, ISBN 978-3-11-017770-1.