New mesogenic compounds possessing a biphenyl ester and ether moiety comprising 1,3-dimethylbarbituric acid: synthesis,characterisation and mesomorphic studies |
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| Authors: | AbdulKarim-Talaq Mohammad H. T Srinivasa Hariprasad Suresh Guan-Yeow Yeap |
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| Affiliation: | 1. Chemistry Department, College of Science, University of Anbar, Ramadi, Iraqdrmohamadtalaq@gmail.com;3. Raman Research Institute, Soft Condensed Matter Group, Bengaluru, India;4. Department of Chemistry, Central College Campus, Bangalore University, Bengaluru, India;5. Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains, Malaysia, Penang, Malaysia |
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| Abstract: | New substituted derivatives of 5-vinyl-1,3-dimethylbarbituric acid were synthesised and evaluated for liquid crystal properties. Two sets of molecules were prepared. One end of all the molecules possesses the 1,3-dimethylbarbituric core. The first set comprises biphenyl ethers, 4a–n and the second set biphenyl esters, 5a–g. Liquid crystalline properties were investigated by POM and DSC techniques. All the compounds exhibited enantiotropic smectic A and nematic mesophases. The LC properties were found to depend on the spacer and terminal alkoxy- chain and alkoxy- ester moiety of the molecules. Smaller alkyl chain members showed a smectic phase, while higher alkyl chain members showed a nematic phase. |
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| Keywords: | Liquid crystals dimethyl barbiturates dimers mesophases heterocycles |
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