Nuclear magnetic resonance studies of the difluoride ion. Part 4.—19F and 1H high-resolution spectra of “amine.n HF” complexes

The 1H and 19F high-resolution magnetic resonance spectra of solutions of amine adducts of the form “amine. n HF”, with n= 1, 1.5, 2 and amine = NEt3, NBun2H, NBun3, C6H5NH2, and p-MeC6H4NH2 have been studied both at room temperature and –80°C. Spectra from both F– and HF–2 ions have been detected, the parameters for the latter showing only small differences from those previously observed in solutions of [Bun4N]+HF–2. It seems probable that the difluoride ion is little distorted from a centred configuration in all such solutions.