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

A layered perovskite-type organic-inorganic hybrid compound, NH3(CH2)(5)NH3MnCl4 (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.