1984•Molecular crystals and liquid crystalsRequires access
Thermal Properties of New Homologous Series of 4-(4-Alkoxyphenoxycarbonyl)phenyl 4-(4-Nitrobenzoyl)benzoates
Shunsuke Takenaka, Shigetsugu Hayashi, Shigekazu Kusabayashi
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Abstract
A homologous series of 4-(4-alkoxyphenoxycarbonyl)phenyl 4-(4-nitrobenzoyl) benzoates has been prepared. The octyloxy and nonyloxy homologs give rise to three kinds of smectic A phases (S1, S2, and S3) and a nematic one, and the decyloxy homolog gives rise to two kinds of the smectic A phases (S1 and S3). The S1 and S3 phases are isomorphous with a partially bilayered smectic A phase (SAd) of CBOOA and a bilayered smectic A phase (SA2) of 4-(4-pentylphenoxycarbonyl)phenyl 4-cyanobenzoate, respectively. The S2 phase may correspond to the antiphase (SÃ) of a smectic A phase. These phase transitions are observed only by the differential scanning calorimeter. Their microscope textures are quite similar to each other.