Abstract
The thermal properties and the orientational order of hydrogen-bonded liquid crystals (6BA)2-(BPy)0.4 and (6BA)2-(BPy)0.3 (6BA: 4-n-hexylbenzoicacid, BPy: 4,4’-bipyridine) were investigated by DSC and 2H NMR. On cooling, isotropic liquid - liquid crystal phase transition temperatures were TC= 409 and 405 K for (6BA)2-(BPy)0.4 and (6BA)2-(BPy)0.3, respectively. Thermal anomalies in the liquid crystal phase were observed at TLC1= 402 and TLC2= 375 K for (6BA)2-(BPy)0.4 and at TLC1= 398 and TLC2= 375 K for (6BA)2-(BPy)0.3. For (6BA)2-(BPy)0.4, only the smectic component was created above TLC1. In addition, the nematic component was created below TLC1. The nematic component gradually changed to the smectic component with decreasing temperature and only the smectic component was observed below TLC2. For (6BA)2-(BPy)0.3, only the nematic component was created above TLC2. The phase transition from the nematic phase to the smectic phase took place at around TLC2.
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