W. K. Lee, P. A. Heiney, M. Ohba, J. N. Haseltine, and A. B. Smith, III, Liq. Cryst. 8, 839-850 (1990).
We have used FTIR absorption to study the crystalline and liquid-crystalline phases of 2,3,7,8,12,13-hexa-n-tetradecanoyloxy-truxene (HATX) and 2,3,7,8,12,13-hexa(4-n-undecyloxybenzoyloxy)truxene (HBTX). Both materials show pronounced changes in the CH2 stretching mode frequencies at their melting points. In addition, HATX shows a transition at about 20 degrees C below the nominal melting point in which the alkyl tails gain significant disorder. Benzene stretching modes and the CH2 deformation modes show subtle changes at the Drd -> N transition of HBTX and at the Drd -> Dhd transition of HATX.
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