Title: Antimony Pentafluoride
CAS Registry Number: 7783-70-2
Molecular Formula: F5Sb
Molecular Weight: 216.75
Percent Composition: F 43.83%, Sb 56.18%
Line Formula: SbF5
Literature References: Lewis acid. Prepd industrially (in aluminum apparatus) according to the equation SbCl5 + 5HF ® 5HCl + SbF5: Ruff, Plato, Ber. 37, 673 (1904); Perkins, Irwin, US 2410358 (1946). Laboratory procedure using SbF3 and F2: Woolf, Greenwood, J. Chem. Soc. 1950, 2200; Kwasnik in Handbook of Preparative Inorganic Chemistry Vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 200. Reviews: Burg in Fluorine Chemistry Vol. 1, J. Simons, Ed. (Academic Press, New York, 1950) pp 104-106; Kemmitt, Sharp, Adv. Fluorine Chem. 4, 210-211 (1965).
Properties: Hygroscopic, corrosive, moderately viscous liquid. Poisonous, attacks skin. mp 8.3°; bp 141°. d25.8 3.097; density data: Hoffman, Jolly, J. Phys. Chem. 61, 1574 (1957). Reacts violently with water. Also forms a solid dihydrate, which reacts violently with more water to form a clear soln. Slowly hydrolyzed in NaOH solns forming Sb(OH)6-. Forms solids with sulfur chloride, carbon disulfide, benzene, toluene, petr ether (resin formation), ether, alc, acetone, ethyl acetate. Glacial acetic acid gives a clear soln. Slowly corrodes glass, copper, lead. May be stored in aluminum vessels.
Melting point: mp 8.3°
Boiling point: bp 141°
Density: d25.8 3.097
Use: In the fluorination of organic compds, see the monograph Preparation, Properties and Technology of Fluorine and Organic Fluoro Compounds, C. Slesser, S. R. Schram, Eds. (McGraw-Hill, New York, 1951) 868 pp.