T-shaped non-symmetrical twin liquid crystalline compounds |
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Authors: | MC Varia S Kumar AK Prajapati |
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Institution: | 1. Raman Research Institute , Sadashivnagar , Bangalore , India variamahesh@yahoo.co.in varia@rri.res.in;3. Raman Research Institute , Sadashivnagar , Bangalore , India;4. Applied Chemistry Department , Faculty of Technology and Engineering, M. S. University of Baroda , Vadodara , India |
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Abstract: | New unconventional T-shaped non-symmetrical dimeric liquid crystalline compounds have been synthesised and their thermotropic properties studied on the hot-stage of a polarising microscope. These compounds consist of an azo-ester mesogenic unit with a range of terminal substituents (–CH3, –OCH3, –NO2 or –Cl) at one end, interconnected by a flexible spacer (n?=?4, 5 or 10) via ether and ester linking units to a biphenyl moiety at the lateral hydroxyl position of the azo-ester. All the compounds were characterised using a combination of elemental analysis and standard spectroscopic methods. The compounds were found to exhibit enantiotropic nematic and smectic mesophases. The effect of different terminal substituents on mesomorphism is discussed. |
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Keywords: | azo-ester ether–ester linkage flexible spacers T-shaped non-symmetrical dimers smectic A |
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