Title: Vanadium Pentafluoride
CAS Registry Number: 7783-72-4
Molecular Formula: F5V
Molecular Weight: 145.93
Percent Composition: F 65.09%, V 34.91%
Line Formula: VF5
Literature 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.
Melting point: mp 19.5°
Boiling point: bp 47.9°
Density: d419.5 2.502
