A new class of liquid crystals: methylene-1,4-dihydropyridines
作者:
DANIEL J. DYER,
VICTOR Y. LEE,
ROBERT J. TWIEG,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 2
页码: 271-281
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998207451
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A group of liquid crystal materials which contain the novel methylene-1,4-dihydropyridine substructure were synthesized and their mesogenic properties examined. Three main classes of liquid crystal compounds which differ in the structure of the aromatic core group (phenyl, azobenzene and diphenylacetylene) attached to the nitrogen of the 1,4-dihydropyridine group were studied. The synthesis of the methylene-1,4-dihydropyridine group was accomplished in excellent yield by a Knoevenagel condensation of a 4-pyridone intermediate with an active methylene compound. The liquid crystal materials prepared thus far which contain this methylene-1,4-dihydropyridine structure all possess broad enantiotropic smectic A phases and one example also possesses a tilted smectic C phase. These mesogens may possess useful properties such as high birefringence.
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