compounds of antimony with halogens. The two types of halides are SbX3, where X is F, Cl, Br, or I, and SbX5, where X is F or Cl. SbF5 and SbCl5 are liquids formed by the reaction of SbF3 and SbCl3 with, respectively, fluorine and chlorine. While SbF5 has no industrial application, SbCl5 is used in organic synthesis. SbCl3, which exists as colorless, hygroscopic crystals, dissolves in hydrochloric and sulfuric acids upon heating and is obtained by the chlorination of antimony or Sb2S3, as well as by dissolving antimony or antimony oxides in hydrochloric acid. This halide is used in obtaining pure antimony trioxide; it also finds use in medicine and in the textile industry. SbF3, which exists as colorless crystals, dissolves readily in water and in hydrofluoric acid; it is produced by dissolving SbCl3 or Sb2(SO4)3 in hydrofluoric acid and is used in the electrolyte during the refining of antimony, as well as in the textile industry. SbBr3 exists as colorless crystals and has almost no practical use. SbI3 is encountered in three modifications, of which the trigonal form is the most common. This halide is obtained by triturating antimony with iodine.
O. E. KREIN