Dielectric and photoluminescence properties of a layered perovskite-type organic–inorganic hybrid phase transition compound: NH3(CH2)5NH3MnCl4

Abstract

A layered perovskite-type organic–inorganic hybrid compound, NH₃(CH₂)₅NH₃MnCl₄ (1), in which the 1,5-diaminopentane cation occupies the space enclosed by the MnCl₆ octahedra, has been successfully synthesized. Systematic characterization methods including differential scanning calorimetry (DSC) measurements, dielectric measurements and variable-temperature structural analyses reveal that compound 1 undergoes a reversible phase transition at 298 K, accompanied by switchable dielectric responses between high and low states and remarkable anisotropy along the various crystallographic axes. Such distinctive dielectric performances mean that 1 could be regarded as a potential switchable dielectric material. Significantly, an intriguing orange emission band at 581 nm can be observed under ultraviolet excitation, which is ascribed to the octahedral Mn²⁺ ion. This finding may extend the application of organic–inorganic hybrids in the field of switchable dielectric materials.