Fourier transform infrared study of two truxene-based discotic liquid crystals
作者:
WahKeat Lee,
PaulA. Heiney,
Masashi Ohba,
JohnN. Haseltine,
AmosB. Smith,
期刊:
Liquid Crystals
(Taylor Available online 1990)
卷期:
Volume 8,
issue 6
页码: 839-850
ISSN:0267-8292
年代: 1990
DOI:10.1080/02678299008047394
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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 CH2stretching 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 CH2deformation modes show subtle changes at the Drd→ N transition of HBTX and at the Drd→ Dhdtransition of HATX.
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