Complex of antimony chloride (III), (V)-thiooxine in aqueous and nonaqueous media, and separation of the each from concentrated hydrochloric acid

Abstract

The reaction between antimony (III), (V) chloride and thiooxine (8-mercaptoquinoline) in aqueous and nonaqueous media was investigated, and the formulas of complexes were determined by the conductimetry and the amounts of Cl, S and Sb in the compounds. Pentachloride precipitated -with the reagent as R₂H₃SbCl₆ in dichloromethane, as RH₂SbCl in conc. HCl, and as RSbCl₄ in glacial acetic acid.
Trichloride formed RH₂SbCl₄ in benzene, RSbCl₂ in dil. HCl, and RHSbCl₃ in glacial acetic acid. Antimony pentachloride gave chloro-complex ion SbCl₆^- in nonaqueous or conc. HCl solution, but is hydrolyzed to [Sb (OH)_xCl_6-x]^- in dil. HCl after a few hours and was not precipitated with the reagent. On the contrary, antimony trichloride was precipitated in dil. HCl, but was not in conc. HCl.
The gravimetric separation of Sb (III) and Sb (V) using conc. and dil. HCl gave good results.