An investigation of the structures of the adducts of SF₄ with BF₃, PF₅, AsF₅, and SbF₅ in the solid state and in solution in HF

15 November 1969

journal article
Published by Canadian Science Publishing in Canadian Journal of Chemistry

Vol. 47 (22) , 4159-4167
https://doi.org/10.1139/v69-689

Abstract

The structure of the solid adducts of SF₄ with several fluoride acceptors has been studied by investigations of the ¹⁸F exchange between S¹⁸F₄ and BF₃ and between SF₄ and B¹⁸F₄, the infrared spectrum of SF₄.BF₃, and the Raman spectra of SF₄.BF₃, SF₄.PF₅, SF₄.AsF₅, and SF₄.SbF₅. The experimental observations are best accounted for in terms of an ionic structure SF₃⁺.MX_n⁻ in each case, but there is good evidence for relatively strong fluorine bridging between the ions.In anhydrous hydrogen fluoride solution, SF₄ and the adducts SF₄.BF₃ and SF₄.SbF₅ were studied conductimetrically and by ¹⁹F nuclear magnetic resonance. Both methods indicate complete ionization of the adducts to SF₃⁺ and the complex fluoroanion. SF₄ is a weak base in hydrogen fluoride ionizing to SF₃⁺ and HF₂⁻.

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An investigation of the structures of the adducts of SF4 with BF3, PF5, AsF5, and SbF5 in the solid state and in solution in HF

Abstract

Keywords

An investigation of the structures of the adducts of SF₄ with BF₃, PF₅, AsF₅, and SbF₅ in the solid state and in solution in HF