Abstract

The liquid crystalline behavior of an azomethine, namely 4-chlorobenzylidene-4-n-butoxyaniline (M), was investigated by using optical polarized light microscopy, differential scanning calorimetry, thermo-optical analysis and powder X-ray diffraction at temperature. Fourier transform infrared spectroscopy (FTIR), in attenuated total internal reflection configuration, was employed in order to analyze the microstructural changes occurring during the azomethine phase transitions. Specific sensitive absorption bands were used to observe the smectic A (SmA) mesophase. The hexatic smectic B (SmB) mesophase was evidenced by recording the CH2 scissoring domain, belonging to the butoxy tail. It was assumed that the hexagonal ordering of the SmB mesophase was proven by the band evolution at 1468 cm−1. The azomethine linkage – monitored by the CH=N moiety stretching vibration – showed insignificant response to temperature due to its rigidity.

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