Abstract
A new one-dimensional organic–inorganic material, 1,5-pentanediammonium pentabromoantimonate (III) (1), exhibits a centrosymmetric-to-non-centrosymmetric symmetry breaking phase transition at 366.5 K, showing a prominent second harmonic generation (SHG) response and dielectric anomalies. The differential scanning calorimetry results indicate the phase transition is a second-order one. The variable-temperature structural analyses reveal that the space group changes from Pnma at 393 K in the high-temperature phase to P212121 at 293 K in the low-temperature phase, accompanied by the loss of a symmetry plane and inversion center. The crystal structure is composed of one-dimensional zigzag chains of corner-sharing SbBr6 octahedra and 1,5-pentanediammonium cations. The origin of the phase transition can be attributed to both the deformation of the zigzag chains and the order–disorder transition of the 1,5-pentanediammonium cations. The compound is SHG-active below the transition temperature, demonstrating its s...
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