Dielectric Relaxation and Beyond Limiting Behavior of Alternating Current Conductivity in A Supermolecular Ferroelectric.

A cyclen-based hybrid supermolecule crystal, [(FeCl2)(cyclen)]Cl (1), where cyclen=1,4,7,10-Tetraazacyclododecane, was prepared using a liquid-liquid diffusion approach. The variable crystal structures exhibit that compound 1 belongs to orthorhombic crystal system, Pna21 space group (point group C2V) in the temperature range of 150-400 K. This hybrid supermolecule shows a dielectric relaxation behavior around the room temperature, and the ferroelectric nature of 1 has been directly verified by hysteresis measurements. In addition, the AC (alternating current) conductivity study reveals that the 1 exists a beyond limiting behavior. These interesting findings are the first time to be reported in the field of supermolecular ferroelectric, maybe opening a new view to construct the supermolecular ferroelectric and giving insight into its conductor behavior.