The proton dynamics in one-dimensional hydrogen-bonding system in molecular co-crystals of tetramethylpyrazine (TMP) with chloranilic acid (H 2 ca), as well as 2,6-dimethylpyrazine (DMP) with H 2 ca is studied by 35 Cl NQR and 2 H NMR spin-lattice relaxation measurements. No transfer motion of proton between the acid and base molecules is observed in DMP-H 2 ca, while the motion of the acid proton is excited in TMP-H 2 ca and the activation energy for the motion increases from 35 kJ mol −1 to 50 kJ mol −1 by the deuteration.
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