Nomenclature
CAS number: 10049-12-4
F
3V; mol wt 107.94.
F 52.80%, V 47.19%.
VF
3.
Description and references
Prepd from VCl3 and HF: Ruff, Lickfett, Ber. 44, 2539 (1911); from VCl2 and HF: Emeleus, Gutmann, J. Chem.
Soc. 1949, 2979; by thermal decompn in an inert
atm of (NH4)3VF6: Sturm, Sheridan, Inorg. Synth. 7, 87 (1963).
Properties
Greenish-yellow powder. d 3.363. mp approx 1406°. Sublimes at bright red heat. Almost
insol in water, alcohol, acetone, ethyl acetate, acetic anhydride,
glacial acetic acid, toluene, carbon tetrachloride, chloroform, carbon
disulfide. Black color with NaOH soln. Aq solns have strong reducing
properties.Derivative
Trihydrate.
Properties
Dark green rhombohedral crystals, obtained by
crystallizing vanadium trioxide dissolved in hydrofluoric acid, or
by electrolytic reduction of a soln of vanadium pentoxide in aq HF.
Loses one molecule of water at 100°. Dissolves in water to some
extent, forming autocomplexes.