Reversible phase transition, switchable dielectric response in In(III)‐based organic–inorganic hybrid compound: [C3H8N]3InBr6

Abstract

Cyclic organic ammoniums have been regarded as the suitable organic components for constructing the organic–inorganic hybrid phase transition materials because they have flexible cyclic structure. Here, an In‐based organic–inorganic hybrid compound, [C3H8N]3InBr6 (1; C3H8N+ is cyclopropylammonium), has been successfully synthesized. It is noteworthy that 1 experiences an invertible phase transition at 298 K (Tc), as certified by DSC measurement. Moreover, single‐crystal X‐ray diffraction determines that 1 crystallized in the monoclinic space group C2/m at 330 K and in the monoclinic space group C2/c at 240 K. Further analyses indicate that the structural phase transition is ascribed to the disorder–order changes of the cyclopropylammonium cations. And an obvious step‐like dielectric anomaly in the vicinity of the Tc is detected. This work will pave the way to the exploration and design of In‐based organic–inorganic hybrid phase transition materials.