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Liquid Crystals Volume 8, 1990 - Issue 6
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Original Articles

Fourier transform infrared study of two truxene-based discotic liquid crystals

Wah Keat Lee Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, U.S.A.
,
Paul A. Heiney Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, U.S.A.
,
Masashi Ohba Department of Chemistry and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, U.S.A.; Faculty of Pharmaceutical Science, Kanazawa University, Takara-Machi, Kanazawa, Japan
,
John N. Haseltine Department of Chemistry and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, U.S.A.; Department of Chemistry, Yale University, New Haven, Connecticut, 06511, U.S.A.
&
Amos B. Smith III Department of Chemistry and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, U.S.A.
Pages 839-850 | Received 09 May 1990, Accepted 22 Jun 1990, Published online: 05 Oct 2006
 
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Abstract

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°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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Related Research Data

Re-entrant isotropic phase in a supramolecular disc-like oligomer of 4-[3,4,5-tris(n-dodecanyloxy)benzoyloxy]-4′-[(2-vinyloxy)ethoxy]biphenyl
Source: Royal Society of Chemistry (RSC)

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