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New Triphenylene Based Discotic Liquid Crystals with Mixed Tails: Molecular Symmetry and Wide Columnar Mesophase Range

✍ Scribed by Ke-Qing Zhao; Bi-Qin Wang; Ping Hu; Cai-Yan Gao; Fu-Jin Yuan; Hui-Rong Li

Book ID: 102098034
Publisher: John Wiley and Sons
Year: 2006
Tongue: English
Weight: 118 KB
Volume: 24
Category: Article
ISSN: 0256-7660
DOI: 10.1002/cjoc.200690040

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✦ Synopsis

A series of new trialkoxytrialkanoyloxytriphenylene TP(OC n H 2n＋1 ) 3 (OCOC m H 2m＋1 ) 3 (5a-5e) (n＝m＋1＝4-8) discotic liquid crystals were prepared and their mesomorphic properties were investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The symmetrical and shorter chain triphenylenes display higher melting points and clearing points, more highly ordered and stable columnar mesophase than the asymmetrical and longer chain triphenylenes respectively.

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Small change in chemical structure of discotic liquid crystals can cause big difference in their mesomorphism. Replacing of the alkoxy peripheral chains of triphenylene by oxygen-atom containing ester chains would result in novel mesomorphism. A series of mixed tail triphenylenes containing propoxya