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The thermal properties of a homologous series of 4(4-alkoxyphenoxycarbonyl)phenyl 5-nitro-2-furancarboxylates have been examined. The heptyloxy, octyloxy and nonyloxy homologs form two kinds of smectic A phases, where the lower phase has a bilayer arrangement of the molecules (SA2) and the higher one the partially bilayer (SAd). The apparent SA-SA transitions can be detected by both differential scanning calorimeter and classical microscope.
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Takenaka et al. (1985) studied this question.
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