Molecular motion and dielectric relaxation in chloroplumbate hybrid crystal

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Molecular motion in crystals often suffer from severe limitations on their dynamic processes, and has received an extraordinary attention as artificial molecule motors and potential molecular dielectric materials. To investigated the relationship between the molecules motion in crystals and dielectric properties. Here, two hybrid crystals [1,3-bis(1-mim)C3]2[Pb4Cl12] (1) and [1,3-bis(1-mim)C3][Pb2Cl6] (2) (1,3-bis(1-mim)C3 = 1,3-bis(1-methylimidazolium)propane), which undergoes interesting dielectric relaxation and molecules motion were reported. Temperature-dependent single crystal structure shows the trans-cis transition of the carbon atoms and twisted rotation of the imidazolium ring were observed for 2. For 1, there exists thermal activating rapid motion for cation. Two compounds exhibit dielectric relaxation.The dielectric constant of 2 are much larger than 1 at the same frequency, which can be ascribed to the reorientational dynamics of guest water molecules and twisted rotation of the cation.