Switching of chirality from racemic to homochiral state in new liquid crystalline monomers with bent-core molecules |
| |
| Authors: | Vladimí ra Novotn V ra Hamplov Miroslav Ka&#x par Milada Glogarov Damian Pociecha |
| |
| Affiliation: | a Institute of Physics, Academy of Sciences of the Czech Republic, 182 21 Prague 8, Czech Republicb Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, 02-089 Warsaw, Poland |
| |
| Abstract: | The synthesis and physical properties of bent-shaped molecules with ester linkages and methoxy substitution on a non-central ring are presented. Terminal chains of most mesogens contain a group with double bond, which promotes polymerization. In all the compounds studied a B2 phase just below the isotropic phase has been found. Polarization current profiles indicate that this phase is antiferroelectric, and dielectric spectroscopy data with a pronounced high frequency mode support this fact. For several compound chirality switching from racemic to the homochiral state was seen after application of a low frequency a.c. field. Another phase, which could be assigned to the B7 family, appears below the B2 phase on cooling. |
| |
| Keywords: | |
| 本文献已被 InformaWorld 等数据库收录！ |
|
