Modelling for columnar liquid crystals exhibiting rectangular to hexagonal transition
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We present the structural study of a biforked compound exhibiting a Colr-Colh phase transition. This studywas performed by means of DSC, optical microscopy, X-ray diffraction, dilatometry and molecular modelling.The molecular packing within the twocolumnar mesophases of this compound is discussed. For the first time, it is shown that the clusters of adjacent molecules which form the elementary section of a column are tilted with respect to the columnar axis in the rectangular mesophase. From the whole set of experimental data, the number of molecules in a columnar section is found to be about 5 in the rectangular mesophase, and 4 in the hexagonal one. The transition between the two columnar mesophases is discussed with respect to its slow kinetics.
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We present the structural study of a biforked compound exhibiting a Colr-Colh phase transition. This studywas performed by means of DSC, optical microscopy, X-ray diffraction, dilatometry and molecular modelling.The molecular packing within the twocolumnar mesophases of this compound is discussed. For the first time, it is shown that the clusters of adjacent molecules which form the elementary section of a column are tilted with respect to the columnar axis in the rectangular mesophase. From the whole set of experimental data, the number of molecules in a columnar section is found to be about 5 in the rectangular mesophase, and 4 in the hexagonal one. The transition between the two columnar mesophases is discussed with respect to its slow kinetics.
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