Abstract
Temperature dependence of infrared spectra was measured in a hexagonal columnar (Col h) mesophase for three homologues of a triphenylene mesogen with two terminal carboxylic acids. It was found for all homologues that the band intensity of hydrogen bonded C=O (approx. 1710 cm −1), as a carboxylic acid dimer, increases at the isotropic to Col h phase transition on cooling, while the monomeric C=O (approx. 1740 cm −1) band decreases. The results strongly indicate that the rotational and translational fluctuations in Col h mesophase is significantly suppressed by the hydrogen bonding interaction and the suppression depends on the spacer length connecting the triphenylene core and carboxylic acid group leading to the modification of mesomorphic thermal stability.
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