Thermal, optical, electrical and structural study of new symmetricalazomethine based on poly(1,4-butanediol)bis(4-aminobenzoate)

摘要

The synthesis, characterization and mesomorphism of new thermotropic imine prepared via condensa-tion of biphenyl-4-carboxaldehyde with poly(1,4-butanediol)bis(4-aminobenzoate) was reported. The structure of imine was characterized by means MR, ~1H, ~(13)C NMR spectroscopy and elemental analysis; the results show an agreement with the proposed structure. The differential scanning calorimetry, polar-izing optical microscopy and X-ray diffraction (WAXRD, SAXRD) were employed to evaluate their phase transitional behavior. The imine exhibited smectic A (SmA) and smectic B (SmB) mesophases. Liquid crys-talline properties of the azomethine were studied additionally via UV-vis spectroscopy in the function of temperature (UV-vis(T)). The compound has one emission band at 360 nm and thermoluminescence emission occurs at about 500-600 nm wavelengths. Current-voltage measurements were performed on ITO/AZ/Alq_3/Al device with three different thickness of the film.