Nomenclature
CAS number: 7783-72-4
F
5V; mol wt 145.93.
F 65.09%, V 34.91%.
VF
5.
Description and references
Prepd from vanadium tetrafluoride by thermal
disproportionation at 650° in N2 current according to the
eq 2VF4 → VF5 + VF3: Ruff, Lickfett, Ber. 44, 2548 (1911); Kwasnik
in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd
ed., 1963) p 253; from the elements: Trevorrow et al., J. Am. Chem. Soc. 79, 5167 (1957); Clark, Emeleus, J. Chem. Soc. 1957, 2119. Review of transition metal pentafluorides:
Peacock, Adv. Fluorine Chem. 7, 113-145 (1973).
Properties
Liquid. mp 19.5°; bp 47.9°. d419.5 2.502. Heat of vaporization 10.60 kcal/mole. Appreciable
vapor pressure at room temp. Hydrolyzed by water, dil alkali. Soly
in anhydrous HF: 3.3 moles/l. Freely sol in alcohol, chloroform,
acetone, ligroin. Insol in carbon disulfide. Dec toluene and ether.
Etches glass slowly at room temp; more rapidly in presence of moisture
with formation of yellow color. May be stored in sealed vessels made
from iron, nickel, copper, platinum.