Preliminary Communication : Induction of smectic A phases by electron donor-acceptor interaction between calamitic mesogens and 2,4,7-trinitrofluorenone
作者:
BERNHARD NEUMANN,
DETLEV JOACHIMI,
CARSTEN TSCHIERSKE,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 4
页码: 509-513
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209234
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The mesomorphic properties of conventional rod-like liquid crystals (diphenyl1,3,4-thiadiazoles, diphenylpyrimidines, diphenyltriazines, diphenyltetrazines and p-terphenyl derivatives), of macrocyclic liquid crystals and of dimesogens can be influenced by addition of the electron acceptor 2,4,7-trinitrofluorenone (TNF). Thereby nematic and smectic C phases are suppressed and smectic A phases can be stabilized or induced. Long and branched terminal chains result in a strong stabilization of the SA phase, whereas no smectic phase is induced to accompany the nematic phases of mesogens with short terminal chains.
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