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The structure of the solid adducts of SF 4  with several fluoride acceptors has been studied by investigations of the  18 F exchange between S 18 F 4  and BF 3  and between SF 4  and B 18 F 4 , the infrared spectrum of SF 4 .BF 3 , and the Raman spectra of SF 4 .BF 3 , SF 4 .PF 5 , SF 4 .AsF 5 , and SF 4 .SbF 5 . The experimental observations are best accounted for in terms of an ionic structure SF 3  + .MX n  −  in each case, but there is good evidence for relatively strong fluorine bridging between the ions.In anhydrous hydrogen fluoride solution, SF 4  and the adducts SF 4 .BF 3  and SF 4 .SbF 5  were studied conductimetrically and by  19 F nuclear magnetic resonance. Both methods indicate complete ionization of the adducts to SF 3  +  and the complex fluoroanion. SF 4  is a weak base in hydrogen fluoride ionizing to SF 3  +  and HF 2  − .

canadian journal of chemistry

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