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Issue 3, 2006
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Bistable linear electro-optical switching in the B7′ phase of novel bent-core molecules

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Abstract

Three novel symmetrical bent-core compounds were synthesized where the terminal alkoxy linkages of the original bent-core mesogen forming a B2 phase was converted to n-alkyl carboxylates. It is found that instead of the B2 phase, all three compounds exhibit a transition between B7′ and B2 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 B7′ phase has been shown to exhibit bistable but analogous linear electro-optical switching without any observable polarization peak. We analyze two theoretical models and find that a local triclinic symmetry may be responsible for the unusual electro-optical switching.

Graphical abstract: Bistable linear electro-optical switching in the B7′ phase of novel bent-core molecules

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Article information


Submitted
09 Nov 2005
Accepted
09 Jan 2006
First published
20 Jan 2006

Soft Matter, 2006,2, 215-222
Article type
Paper

Bistable linear electro-optical switching in the B7′ phase of novel bent-core molecules

S. Umadevi, A. Jákli and B. K. Sadashiva, Soft Matter, 2006, 2, 215
DOI: 10.1039/B515933D

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