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Solutions of anhydrous HF and SO 2  and electrolytes in anhydrous HF have been studied by n.m.r. Both  1 H and  l9 F chemical shifts were studied as a function of concentration and temperature. The dimerization constant and the enthalpy of the reaction [Formula: see text] were calculated.The results for electrolyte solutions were interpreted on the basis of two effects, ionization and the H-bond breaking effect. A linear relationship exists between δ 0 , the molal chemical shft, and the ionic crystallographic radii. A temperature effect was also observed and interpreted. Solutions of salts of Lewis acids were also studied but results are less conclusive; it was shown, however, that their δ 0  values are smaller than those of alkali fluorides.

N.M.R. Studies of Anhydrous Hydrogen Fluoride Solutions