Title: Antimony Trifluoride
CAS Registry Number: 7783-56-4
Additional Names: Antimony fluoride; antimonous fluoride
Molecular Formula: F3Sb
Molecular Weight: 178.76
Percent Composition: F 31.88%, Sb 68.11%
Line Formula: SbF3
Literature References: Prepd by dissolving Sb2O3 in aq HF and evaporating the water: Berzelius, Pogg. Ann. 1, 34 (1824); Söll, FIAT-Review 23, 276 (1947); Andersen et al., Acta Chem. Scand. 7, 236 (1953); Kwasnik in Handbook of Preparative Inorganic Chemistry Vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 199. Industrial prepn from SbCl3 and HF: Midgeley et al., US 2024654 (1935). Reviews: Burg in Fluorine Chemistry Vol. 1, J. H. Simons, Ed. (Academic Press, New York, 1950) p 106; Kemmitt, Sharp, Adv. Fluorine Chem. 4, 211 (1965).
Properties: Orthorhombic, deliquesc crystals. Poisonous! Irritates the skin. d2020 4.379. mp 292°. bp 376°. Also reported as bp 319° (Andersen). Soly in water (g/100 ml): 443 (20°); 562 (30°). Dissolves in water with limited hydrolysis, readily forms complexes such as [SbF4]- and many sol salts. For the purpose of halogen exchange fluorination, the compd must be dry: Henne, US 2082161 (1937). May be stored in glass vessels or steel drums. Keep well closed.
Melting point: mp 292°
Boiling point: bp 376°; bp 319° (Andersen)
Density: d2020 4.379
Use: To catalyze fluorinations by HF, manuf chlorofluorides, in dyeing, usually in form of double salts, e.g., antimony sodium fluoride or antimony fluoride and ammonium sulfate double salt, manuf pottery and porcelains.