Thermal and optical characterization of a novel series of supramolecular liquid crystals |
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| Authors: | N Pongali Sathya Prabu DM Potukuchi MLN Madhu Mohan |
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| Institution: | 1. Liquid Crystal Research Laboratory (LCRL), Bannari Amman Institute of Technology, Sathyamangalam 638 401, India;2. Department of Physics, University College of Engineering, Jawaharlal Nehru Technological University, Kakinada 533003, India |
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| Abstract: | Supramolecular hydrogen bonded liquid crystal (SMHBLC) homologous series is synthesized and characterized. Hydrogen bond is formed between p-n-alkyloxy benzoic acids (nOBA, where n=7 to 12) and Iodo substituted benzoic acid (ImBA) respectively. The isolated homologs are characterized by various techniques like Polarizing Optical Microscopy (POM), Differential Scanning Calorimetry (DSC), 1H Nuclear Magnetic Resonance Spectroscopy (NMR) and Fourier Transform Infrared Spectroscopy (FTIR). From the POM and DSC studies phase diagram has been constructed and discussed. A new smectic ordering, labeled as smectic R, has been characterized which exhibits a ribbon like texture. This phase is observed in a complex pertaining to the undecyloxy carbon number. Tilt angle in smectic R phase and in traditional smectic C of all the complexes have been experimentally deduced and the results are fitted and so obtained β value concurrences with the Mean field theory predicted value. |
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| Keywords: | Hydrogen bond Cacoon texture 1H NMR DSC POM Smectic R |
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