RESUMEN
The title compound, {(CH3CH2ONH3)2[CdCl4]}n, consists of bilayers of organic CH3CH2ONH3 + cations and infinite [CdCl4]n 2n- inorganic layers. It can be described as an organic-inorganic hybrid layered perovskite. In the crystal structure, the CdII cation is situated at an inversion center and is coordinated by six chloride ions, forming a slightly distorted octa-hedral coordination polyhedron. By corner-sharing of the [CdCl6] octa-hedra, infinite [CdCl4]n 2n- inorganic layers are formed, extending parallel to (100). The inorganic layers alternate with bilayers of CH3CH2ONH3 + cations, whereby the connection of the cationic and anionic layers is achieved through N-Hâ¯Cl hydrogen bonds and Coulombic inter-actions.
RESUMEN
An organic-inorganic hybrid ferroelectric, (C6H5CH2CH2NH3)2[HgI4], undergoes an exceptional structural phase transition near room temperature, triggered by a flip of half the organic cations and an order-disorder transition of the inorganic anions, and may be regarded as a displacive-type ferroelectric. This finding provides a new structural phase transition mechanism in molecule-based ferroelectrics.