Dielectric anomaly and giant deuteration effect in a H-bond trimeric co-crystal [4, 4'-Bipyridine]<sub>2</sub>[1,4-dihydroxybenzene]
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Co-crystal [4,4<b>ʹ</b>-bipyridine]<sub>2</sub>[1,4-dihydroxybenzene] (<b>1</b>) was prepared by evaporating methanol solution of 4,4<b>ʹ</b>-bipyridine with 1,4-dihydroxybenzene at 4°C. <b>1</b> shows a fascinating dielectric anomaly with a maximum at ~210 K, which is independent on ac frequency. However, the absence of thermal anomaly and structural phase transition is related to the dielectric anomaly. The co-crystal [4,4<b>ʹ</b>-bipyridine]<sub>2</sub>[1,4-dihydroxybenzene-d<sub>2</sub>] (<b>2</b>) was further obtained via H<sup>+</sup>/D<sup>+</sup> exchange in <b>1</b> and the deuteration gives rise to the maximum shifting to 254 K in the dielectric spectrum of <b>2</b>. The dielectric anomaly corresponds to disorder-to-order transformation of H<sup>+</sup>/D<sup>+</sup> in the O–H/D···N H-bond in <b>1</b> and <b>2</b>.
