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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.
|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.|
|Alternative Location: ||http://dx.doi.org/10.1039/b109546c|
|Copyright: ||2002 Royal Society of Chemistry|
|Appears in Collections:||Research Papers (SCM)|
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