Vanadium(III) fluoride

Chembox new
Name = Vanadium(III) fluoride
ImageName = Vanadium(III) fluoride
OtherNames = Vanadium fluoride, Vanadium trifluoride
Section1 = Chembox Identifiers
CASNo = 10049-12-4
Section2 = Chembox Properties
Formula = VF₃
MolarMass = 107.94 g/mol
Appearance = gray-green powder
Density = 3.363 g/cm³, solid
Solubility = insoluble
MeltingPt = 1406 °C
BoilingPt =
Section7 = Chembox Hazards
EUClass = not listed
NFPA-H = 3
NFPA-R = 2
NFPA-F = 0
Section8 = Chembox Related
OtherAnions = Vanadium(III) chloride
Vanadium(III) oxide
Vanadium(III) nitride
OtherCations = Vanadium(IV) fluoride
OtherFunctn =
Function =
OtherCpds =

Vanadium(III) fluoride is the chemical compound with the formula VF₃. This gray-green, refractory solid is obtained in a two-step procedure from V₂O₃. [Sturm, B. J.; Sheridan, C. W. "Vanadium(III) Fluoride" Inorganic Syntheses 1963; Vol. 7, pages 52-54. ISBN 0-88275-165-4.] The first step entails conversion to the hexafluorovanadate(III) salt using ammonium bifluoride:

:V₂O₃ + 6 (NH₄)HF₂ → 2 (NH₄)₃VF₆ + 3 H₂O

In the second step, the hexafluorovanadate is thermally decomposed.:(NH₄)₃VF₆ → 3 NH₃ + 3 HF + VF₃

The thermal decomposition of ammonium salts is a relatively common method for the preparation of inorganic solids.

VF₃ can also be prepared by treatment of V₂O₃ with HF.VF₃ is a crystalline solid with 6 coordinate vanadium atoms with bridging fluorine atoms. The magnetic moment indicates the presence of 2 unpaired electons.

References