Novel liquid-crystal materials based on 1-alkyl-4-[5-(dodecylsulfanyl)-1,3,4-oxadiazol-2-yl]pyridinium bromide derivatives were synthesized. Their thermotropic polymorphism was investigated by polarizing optical microscopy and differential scanning calorimetry. The structures of their crystalline and smectic A phases were investigated by X-ray diffraction. The existence of thermochromic properties in the smectic phase as well as their UV−visible and fluorescence properties were also studied. The chemical structure of the compounds renders these materials suitable for optoelectronic applications.
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Haristoy et al. (2003) studied this question.
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