MESOGENIC BEHAVIOR OF OPTICALLY-ACTIVE ALLENES - A NEW CLASS OF FLC

Citation
R. Lunkwitz et al., MESOGENIC BEHAVIOR OF OPTICALLY-ACTIVE ALLENES - A NEW CLASS OF FLC, Ferroelectrics (Print), 212(1-4), 1998, pp. 265
Citations number
21
Categorie Soggetti
Physics, Condensed Matter","Material Science
Journal title
ISSN journal
00150193
Volume
212
Issue
1-4
Year of publication
1998
Database
ISI
SICI code
0015-0193(1998)212:1-4<265:MBOOA->2.0.ZU;2-L
Abstract
Some optically active liquid crystalline 1,3,4-thiadiazole derivatives incorporating differently substituted allenic moieties providing an a xis of chirality have been synthesized. The compounds were investigate d by polarizing microscopy, by differential scanning calorimetry and b y electrooptical investigation. Thereby a common ferroelectic behavior was found in the case of two derivatives whereas a more complex S-C- polymorphism was found in the case of the other derivatives. We propos e the occurrence of an antiferroelectric, a ferrielectric and a ferroe lectric phase.