Dielectric anomaly and giant deuteration effect in a H-bond trimeric co-crystal [4, 4’-bipyridine] 2 [1,4-dihydroxybenzene]

However, the absence of thermal anomaly and structural phase transition is related to the dielectric anomaly. The co-crystal [4,4’-bipyridine] 2 [1,4-dihydroxybenzene-d 2 ] ( 2 ) was further obtained via H + /D + exchange in 1 and the deuteration gives rise to the maximum shifting to 254 K in the dielectric spectrum of 2 .

The dielectric anomaly corresponds to disorder-to-order transformation of H + /D + in the O-H/D…N H-bond in 1 and 2 .