Title:	Unusual mesomorphic behaviour in bent-core compounds derived from 5-cyanoresorcinol
Authors:	Reddy, Amaranatha R. Sadashiva, B.K.
Issue Date:	Aug-2004
Publisher:	Taylor & Francis
Citation:	Liquid Crystals, 2004, Vol.31, p1069 - 1081
Abstract:	We describe the synthesis and mesomorphic properties of the first two homologous series of bent-core compounds derived from 5-cyanoresorcinol. The lower homologues in both series show a normal B1 phase, and the mesophase of higher homologues exhibits very unusual textures and electro-optical switching behaviour. The observation of spiral growth patterns under a polarizing microscope, and only layer reflections from X-ray diffraction studies for these homologues, suggests that this mesophase is different from a B2 phase. This mesophase shows chiral domains of opposite handedness which can be identified from electric field experiments. Under a triangular-wave electric field, at lower voltages although the mesophase shows a ferroelectric type switching behaviour it is actually antiferroelectric in nature. The observation of helical structures and spontaneously formed chiral domains suggests that the mesophase is a variant of the B2 phase.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/2904
ISSN:	0267-8292 1366-5855 (Online)
Alternative Location:	http://dx.doi.org/10.1080/02678290410001723378
Copyright:	2004 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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