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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.
ISSN: 1366-5855-(Online)
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Copyright: 2010 Taylor & Francis
Appears in Collections:Research Papers (SCM)

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