Preparation and identification of various chlorodifluoro-oxosulphur(VI) salts. Evidence for chlorotrifluorosulphur(VI) oxide

Abstract

The salts OSClF₂⁺X^–(X^–= AsF₆^–, PF₆^–, SbF₆^–, and Sb₂F₁₁^–) are prepared in good yield by the reaction of thionyl fluoride with the Cl₂F⁺ salt, or chlorine monofluoride and the corresponding pentafluoride under the appropriate conditions. The identity, and ionic formulation of these salts is established by comparison of their i.r. and Raman spectra with those of the corresponding anions and OPClF₂. The thermal stability increases in the order: PF₆^– < AsF₆^– < SbF₆^– < Sb₂F₁₁^–. Their mass spectra are consistent with initial dissociation into OSClF₃ and the corresponding pentafluoride.