title: Structural phase transitions of a layered organic-inorganic hybrid compound: tetra(cyclopentylammonium) decachlorotricadmate(II), [C₅H₉NH₃]₄Cd₃Cl₁₀.
abstract: A layered organic-inorganic hybrid compound, tetra(cyclopentylammonium) decachlorotricadmate(II) (1), in which the two-dimensional [Cd3Cl10](4-)n networks built up from three face-sharing CdCl6 octahedra are separated by cyclopentylammonium cation bilayers, has been discovered as a new phase transition material. It undergoes two successive structural phase transitions, at 197.3 and 321.6 K, which were confirmed by differential scanning calorimetry measurements, variable-temperature structural analyses, and dielectric measurements. The crystal structures of 1 determined at 93, 298, and 343 K are solved in P2₁2₁2₁, Pbca, and Cmca, respectively. A precise analysis of the structural differences between these three structures reveals that the origin of the phase transition at 197.3 K is ascribed to the order-disorder transition of the cyclopentylammonium cations, while the phase transition at 321.6 K originates from the distortion of the two-dimensional [Cd3Cl10](4-)n network.
authors.affiliation: Ordered Matter Science Research Center, Southeast University , Nanjing 211189, PR China.
authors.forename: Wei-Qiang
authors.initials: WQ
authors.lastname: Liao
authors.forename: Guang-Quan
authors.initials: GQ
authors.lastname: Mei
authors.forename: Heng-Yun
authors.initials: HY
authors.lastname: Ye
authors.forename: Ying-Xuan
authors.initials: YX
authors.lastname: Mei
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang