Molecular Ferroelectric Piperidine‐4‐ylmethanaminium Perchlorate with Superior Switchable Dielectric Properties

Abstract A new piperidyl‐based molecular ferroelectric piperidine‐4‐ylmethanaminium perchlorate (compound 1) has been successfully synthesized, which undergoes a reversible phase transition around T c = 258.8 K. The spontaneous polarization of compound 1 is about 0.63 μC/cm 2 and coercive field as small as 1.14 kV/cm at 192 K. The variable‐temperature single‐crystal X‐ray diffraction reveals that the space group transforms from a polar space group of P2 1 at 173 K to a centrosymmetric space group of P2 1 2 1 2 1 at 293 K. Especially, the dielectric anomaly at the phase transition temperature increases more than 4 times, which indicates potential applications in switchable dielectric devices.