Preparation and characterization of some salts of the difluoro-oxobromine(V) cation

Abstract

Bromosyl fluoride BrOF₃ is shown to form 1 : 1 adducts by direct reaction with BF₃ and AsF₅, and the preparation of the compound BrOF₃·SbF₅ by an indirect method is described. The Raman and ¹⁹F n.m.r. spectra of these adducts are interpreted in terms of the ionic structures [BrF₂O][BF₄], [BrF₂O][AsF₆], and [BrF₂O][SbF₆], although, in the solid phase, the [AsF₆]^– and [SbF₆]^– anions probably bridge strongly to the cation. The [BF₄]^– and [AsF₆]^– salts decompose thermally to the [Br₂]⁺ cation, while the [SbF₆]^– salt appears to give [BrF₂]⁺.