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

Solutions of anhydrous HF and SO2 and electrolytes in anhydrous HF have been studied by n.m.r. Both 1H and l9F 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 δ0, 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 δ0 values are smaller than those of alkali fluorides.