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Syntheses and properties of liquid crystalline N-substituted pyrroles and their polymers

✍ Scribed by Masashi Kijima; Hideki Hasegawa; Hideki Shirakawa

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
193 KB
Volume
36
Category
Article
ISSN
0887-624X

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✦ Synopsis

Three liquid crystalline N-substituted pyrroles were synthesized from 6-(1pyrrolyl)hexanol with phenolic derivatives having a mesogenic core of cyclohexylbenzene or biphenyl by Mitsunobu reaction. These pyrroles had two anodic peaks at 1.4 and 1.8 V (vs. SCE). The former was due to an oxidation of the pyrrole moiety and the latter was due to an oxidation of the mesogenic moiety. These pyrrole monomers were polymerized by electrochemical and chemical methods. The potentiostatic method and the chemical method using FeCl 3 gave a soluble and fusible polymer, respectively. A polymer having a mesogenic core of cyclohexyl benzene obtained by the chemical method and a polymer having a mesogenic core of biphenylketone obtained by the potentiostatic method had a liquid-crystalline phase. The phase was identified as smectic A by polarizing microscopy and XRD analysis.

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