A novel proton transfer supramolecular compound induced by N–H⋯O hydrogen bond through 18-crown-6: Syntheses,structures, and dielectric properties

A novel organic–inorganic hybrid supramolecular compound, (4-Nitroanilinium)(18-crown-6)]BF₄](CH₃CN), was prepared via H-bond dipole interactions between 4-nitroanilinium, 18-crown-6, and BF₄⁻, in acetonitrile solution. N–H…O hydrogen bonds between neighboring 4-nitroanilinium cations and 18-crown-6 were observed. However, the formation of one-dimensional supramolecular chain structure via N–H…O that contacts through the cavity of 18-crown-6 was worth noting. A strong dielectric response was observed above 300 K at a low frequency of 500 Hz, thereby suggesting the proton transfer in the N–H…O bonds.