Abstract
If the 17O quadrupole double resonance results at room temperature for a number of hydrogen-bonded dimeric carboxylic acids, and β-oxalic acid, are interpreted in terms of a proton disorder model, it can be shown that the observed variations are satisfactorily explained in terms of fast concerted two-proton jumps, O 1HO 2 → O 1HO 2 within the dimer, but are inconsistent with rotational disorder. Similar arguments are used to show that the (HCO 3) 2 2− dimer in KHCO 3 is also significantly disordered at room temperature by the same mechanism.
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