Thermal, optical, electrical and structural study of new symmetrical azomethine based on poly(1,4-butanediol)bis(4-aminobenzoate)
摘要:
The synthesis, characterization and mesomorphism of new thermotropic imine prepared via condensation of biphenyl-4-carboxaldehyde with poly(1,4-butanediol)bis(4-aminobenzoate) was reported. The structure of imine was characterized by means FIFIR, H-1, C-13 NMR spectroscopy and elemental analysis; the results show an agreement with the proposed structure. The differential scanning calorimetry, polarizing 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 crystalline 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. (c) 2009 Elsevier B.V. All rights reserved.