Abstract
A new hybrid ferroelectric compound, [4′-nitrobenzylidene-1-aminopyridinium][PbBr3](1) has been synthesized and characterized structurally. The compound 1 crystallizes in the monoclinic crystal system with the space group Cc. The unit cell parameters are a = 12.1611(14) Å, b = 18.230(2) Å, c = 7.6899(7) Å, β = 94.661(10)° and V = 1699.2(3) Å3. The structure exhibits face-sharing PbBr6 octahedral chains in inorganic components. The intermolecular interactions were quantified and analyzed using Hirshfeld surface analysis, indicating the frequent contacts are mainly ascribed to H…Br, O⋯H and Pb…Br contacts. The compound 1 shows two dielectric anomalies around 90 °C and 140 °C, as well as huge dielectric constant above 90 °C. The macroscopic polarization reversal of the hybrid crystal probably arises from the dipole reversal of the polar PbBr6 octahedral by means of the relative displacement of Pb2+ ion along one Pb-Br bond.
Published Version
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