A series of 2-phenylbenzoxazole liquid crystals having intramolecular hydrogen-bonded Schiff's base linkers have been synthesised. All of them exhibit liquid crystalline phase behaviour. They showed only SmC phase transition. The phase is stabilised over a wide temperature range due to the presence of intramolecular H-bonding.
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Ghosh et al. (2011) studied this question.
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