Synthesis, structure, and phase transition of a novel proton transfer in a supramolecular cation with 2-nitroanilinium based on 18-crown-6

a) View of the nitrogen (N1) atom of the NH3+ group can associate with neighboring oxygen atoms O1 and O7 through intramolecular hydrogen bonds N1H⋯O1 and intermolecular hydrogen bonds N1H⋯O7; b) Dielectric constants of complex 1 measured at frequencies of 500 Hz to 1 MHz from 100 K to 296 K.237