Anisotropic dielectric phase transition triggered by pendulum-like motion coupled with proton transfer in a layered hybrid crystalline material (4-nitroanilinium+) (18-crown-6) (H2PO4−) (H3PO4)2

a) View of the self-assembly packing of supramolecular cations and anions along the a-axis in complex 1, showing the organic cation layer and the inorganic phosphate anion layer were arranged alternately. b) Dielectric constants of 1 measured along the a-axis at frequencies of 5 KHz and 10 KHz. Inset: calculated potential energy for the pendulum-like motion of the nitro-group.344