Synthesis and thermal properties of liquid crystalline compounds containing carbazolyl group

Article abstract of DOI:10.1080/10587250108025284

New liquid crystalline compounds containing carbazolyl moiety as part of the mesogenic group were synthesized. 2-(9-Methylcarbazolyl)-4-alkoxybenzoate and 2-(9-methylcarbazolyl)-4-trifluoromethylbenzoate did not show any textures by polarizing optical microscopy (POM) measurement. However, 2-(9-methylcarbazoIyl)-4-cyanobenzoate and 2-(9-metylcarbazolyl)-4-alkanecarboxybenzoate show schlieren texture. 2-(9-methylcarbazolyl)-4-cyanobenzoate has two phase transition temperatures on both heating and cooling process. By X-ray diffraction measurement of this compound, only one weak broad peak was detected at the mesomorphic temperature in the wide-angle region. Therefore, the LC phase of the compound was assigned to a nematic. 2-(9-MethylcarbazolyI)-4-pentynyIcarboxybenzoate shows only one phase transition on heating process. However, the compound shows two phase transition temperatures on cooling processes. By X-ray diffraction measurement, the compound indicates two broad peaks at around 4.5 and 19.0 degree. These LC phases would be assigned to a cybotactic nematic phase based on the shorten molecular length of the calculated value and the optical texture.

Full text of DOI:10.1080/10587250108025284

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Molecular Crystals and
Liquid Crystals Science
and Technology. Section A.
Molecular Crystals and Liquid
Crystals
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Synthesis and Thermal
Properties of Liquid Crystalline
Compounds Containing
Carbazolyl Group
Ken Matsumoto a & Naoyuki Koide a
a Department of Chemistry, Faculty of Science ,
Science University of Tokyo , 1-3 Kagurazaka,
Shinjuku-ku, Tokyo, 162-8601, JAPAN
Published online: 27 Oct 2006.
To cite this article: Ken Matsumoto & Naoyuki Koide (2001) Synthesis and Thermal
Properties of Liquid Crystalline Compounds Containing Carbazolyl Group, Molecular
Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and
Liquid Crystals, 365:1, 81-89, DOI: 10.1080/10587250108025284
To link to this article: http://dx.doi.org/10.1080/10587250108025284
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