Thermal and Optical Characterization of Linear Hydrogen Bonded Supramolecular Liquid Crystal Mixture
T Vasanthi1, V Balasubramanian2, P Subhasri3, R Jayaprakasam4, V N Vijayakumar5
1T. Vasanthi, Department of Physics, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology (BIT), Sathyamangalam, India 638 401.
2V Balasubramanian, Department of Science, Sona College of Technology, Salem, Tamilnadu, India 636 005.
3P Subhasri, Department of Physics, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology (BIT), Sathyamangalam, India 638 401.
4R Jayaprakasam, Department of chemistry, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology (BIT), Sathyamangalam, India 638 401.
5V N Vijayakumar, Department of Physics, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology (BIT), Sathyamangalam, India 638 401.
Manuscript received on 02 June 2019 | Revised Manuscript received on 10 June 2019 | Manuscript published on 30 June 2019 | PP: 1652-1656 | Volume-8 Issue-8, June 2019 | Retrieval Number: H6341068819/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Supramolecular HBLC (hydrogen bonded liquid crystal) mixture is prepared through non-mesogenic compound of 4-Aminobenzoic acid (ABA) and mesogenic compound of 4-(Dodecyloxy)benzoic acid (12OBA). The presence of functional group and forming of intermolecular H-bond between the HBLC mixture is verified by FT-IR spectroscopy. Mesophase transition temperature, order of transitions and enthalpy values are the LC parameters which have been evidenced through optical and thermal studies. Nuclear Magnetic Resonance ( 1H NMR) spectroscopic studies are added evident to the existence of intermolecular complementary and cyclic type of H-bonding in the present mixture. A noteworthy observation highly ordered Smectic C mesogenic phase along with the new Smectic X mesogenic phase is noticed as finger-print texture. Nematic (N) to Smectic (Sm X) mesogenic phase is identified as 1 st order transition. Another interesting observation of the present work is the identification of wider phase width of mesogenic phases and decreased enthalpy values in the present mixture which is compared to the individual compounds.
Keyword: HBLC, Smectic X, 1H NMR, FT-IR, Smectic C.
Scope of the Article: Optical Devices.