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Abstract
The pentafluorosulphur cation (SF + 5) is formed by the dissociative protonation of sulphur hexafluoride by CH + 5. This place an upper limit of 9.83 ± 0.18 eV on the appearance energy (AE) of SF + 5 from SF 6. SF + 5 forms adducts with many bases. The water and methanol adducts lose 2HF and HF + CH 3F respectively to give the very stable ion SF 3O +. The adducts of acetone and ethanol transfer a proton to the neutral molecule. Benzene and toluene are the only aromatic hydrocarbons to form significant yields of adducts; these lose one molecule of HF at long reaction times. SF + 5 reacts with the higher aromatic hydrocarbons mainly by electron transfer. Nitriles form very stable adducts. In all the adducts the binding between sulphur and the basic site of the molecule appears to be particularly strong although the actual binding energies could not be quantified by equilibrium SF + 5 transfer measurements. Only the nitrile adducts showed some evidence that SF + 5 transfer might occur between different bases.
Published Version
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