Bent-shaped mesogens without an azomethine joint
- 12 September 2002
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 12 (12) , 3392-3399
- https://doi.org/10.1039/b205036f
Abstract
A new series of banana-shaped mesogens with ethylene links in the branches and laterally substituted are presented. They form B1, B2, B6 and B7-like phases. The B7-like and B2 phases are not miscible although identical crystallographic structures are deduced from X-ray studies. The switching in the B7-like phase is without a threshold and occurs only in a small number of domains. Dielectric measurements do not confirm ferroelectric properties for the B7-like phase, and only a weak non-collective relaxation process was observed. In the B2 phase a collective and weak dielectric mode was detected. The B1 phase exhibits a columnar structure with a large rectangular cell 111.6 × 51 Å2.Keywords
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