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Title: Biaxial smectic A phase in homologous series of compounds composed of highly polar unsymmetrically substituted bent-core molecules
Authors: Sadashiva, B.K.
Reddy, Amaranatha R.
Pratibha, R.
Madhusudana, N.V.
Issue Date: 2002
Publisher: Royal Society of Chemistry
Citation: Journal of Materials Chemistry, 2002, Vol.12, p943 - 950
Abstract: Several compounds belonging to three new series of five-ring banana-shaped esters, which are unsymmetrically substituted with respect to the central phenyl ring, have been synthesised. One of the arms of these bent-core molecules has been terminally substituted with a highly polar cyano group while the other end contains an alkoxy chain. The mesophases exhibited by these compounds have been characterised using a combination of optical polarising microscopy, differential scanning calorimetry and X-ray diffraction studies. These studies indicate that most of the compounds show two smectic A mesophases which have a partial bilayer ordering. Conoscopic experiments clearly reveal that the lower temperature smectic A phase is biaxial in nature. A structural model has been proposed for the lower temperature biaxial smectic A phase. It is argued that quartets of molecules, which are conducive to the formation of the biaxial phase, can form in the layers. The in-layer birefringence of the biaxial smectic A phase has also been measured as a function of temperature for one of the compounds.
Description: Restricted Access.
ISSN: 0959-9428
1364-5501 (Online)
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Copyright: 2002 Royal Society of Chemistry
Appears in Collections:Research Papers (SCM)

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