Abstract
In the preceding paper the structure of terephthalic acid C 6D 4(COOD) 2 has been found to be ordered to a high extent at 2 K, whereas an almost complete disorder of the hydrogen-bond protons was observed at 300 K. In this part, the temperature dependence of the dipolar lineshape of the two hydrogen-bonded protons in ring-deuterated terephthalic acid C 6D 4(COOH) 2 is studied. The results are consistent with dynamic disorder in an asymmetric double-minimum potential with a free enthalpy difference of the two tautomeric species of 2 kJ/mole.
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