Title

Bistable Linear Electro-Optical Switching in the B-7 ' Phase of Novel Bent-Core

Publication Title

Soft Matter

Publication Date

3-7-2006

Document Type

Article

DOI

10.1039/b515933d

Keywords

banana-shaped molecules, smectic liquid-crystals, helical superstructures, mesomorphic properties, columnar mesophases, homologous series, achiral molecules, mesogens, 2, 7-dihydroxynaphthalene, transition

Disciplines

Physics

Abstract

Three novel symmetrical bent-core compounds were synthesized where the terminal alkoxy linkages of the original bent-core inesogen forming a B-2 phase was converted to n-alkyl carboxylates. It is found that instead of the B-2 phase, all three compounds exhibit a transition between B-7' and B-2 mesophases. The physical and electro-optical properties have been investigated by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction and electric field experiments. The higher temperature B-7' phase has been shown to exhibit bistable but analogous linear electro-optical Switching Without,my observable polarization peak. We analyze two theoretical models and find that a local triclinic symmetry may be responsible for the unusual electro-optical switching.

Comments

Available on publisher's site at http://dx.doi.org/10.1039/b515933d.

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