Title:	Occurrence of a transition between two polar orthogonal smectic phases in a new homologous series of novel bent-core compounds
Authors:	Radhika, S. Sadashiva, B.K. Pratibha, R.
Keywords:	bent-core biphenyl moiety polar uniaxial smectic A polar biaxial smectic A
Issue Date:	Apr-2010
Publisher:	Taylor & Francis
Citation:	Liquid Crystals, 2010, Vol.37, p417
Abstract:	Two new homologous series of isomeric achiral five-ring bent-core compounds containing 3,4-disubstituted biphenyl moiety have been synthesised and the mesophases that they exhibit characterised. Compounds of series A are obtained from 4-hydroxybiphenyl-3-carboxylic acid while those in series B are prepared by reversing the position of the hydroxyl and carboxylic groups. This change seems to have a profound effect on the mesophase properties. Interestingly, for compounds of series A containing the long terminal chain, a transition between two polar orthogonal smectic phases has been observed. The observed mesophases have been characterised using a combination of polarised light optical microscopy, differential scanning calorimetry, X-ray diffraction studies and electro-optical measurements. This is the first example of a transition between two partial bilayer polar orthogonal smectic phases. In addition, the effect of a fluoro substituent ortho to the strongly polar terminal cyano group on the mesophase has also been examined.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/3959
ISSN:	1366-5855-(Online) 0267-8292
Alternative Location:	http://dx.doi.org/10.1080/02678291003632645
Copyright:	2010 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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