Proton dynamics in one-dimensional hydrogen-bonding system in molecular co-crystals TMP-D2ca and DMP-H2ca |
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| Authors: | T Asaji D Amino N Tago M Mizuno |
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| Institution: | 1. Department of Chemistry, College of Humanities and Sciences, Nihon University, Tokyo, 156-8550, Japan
2. Department of Chemistry, Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa, 920-1192, Japan
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| Abstract: | The proton dynamics in one-dimensional hydrogen-bonding system in molecular co-crystals of tetramethylpyrazine (TMP) with chloranilic acid (H2ca), as well as 2,6-dimethylpyrazine (DMP) with H2ca is studied by 35Cl NQR and 2H NMR spin-lattice relaxation measurements. No transfer motion of proton between the acid and base molecules is observed in DMP-H2ca, while the motion of the acid proton is excited in TMP-H2ca 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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