Abstract
Earlier work has indicated that arsenic pentafluoride when dissolved in anhydrous HF is present largely as the anion As 2F 11 -, particularly temperatures much below ambient. Raman spectra and conductance measurements are used here to show that, at and near room temperature, there are significant concentrations of molecular AsF 5, AsF 6 - and As 2F 11 -in equilibrium and that on reduction of temperature, As 2F 11 - is formed at the expense of AsF 5 and AsF 6 -. The implications of the Lewis acid and oxidant strengths of AsF 5 are discussed as affecting synthetic procedures in anhydrous HF.
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