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Investigation on Thermal and Optical Properties of Hydrogen-Bonded Binary Liquid Crystals

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Abstract

A homologous series of hydrogen-bonded liquid crystals (HBLCs) are synthesized and characterized. Intermolecular hydrogen bonding occurs between 4-methoxycinnamic acid (4MCA) and p-n-alkyloxy benzoic acids (nOBA, where n = 3, 7 to 12). These binary complexes have been obtained by following well-designed synthesis route. The subsequent binary complexes have been characterized by polarizing optical thermal microscopy (POM), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FTIR). The present work explains the details of the association between the mesogenic phase behavior and H-bonding in the homologous series of 4MCA + nOBA. Nematic phase is interrelated with the closed dimers between acid molecules through the formation of strong hydrogen bonds. But, high concentrations are linked to the manifestation of smectic phases that disturb the local order of the nematic phase. As a result, the higher-order mesophases are observed in the present binary complex series. The inclusion of nematic LC (4MCA) in the nOBA alters the melting temperature and the clearing temperature as lower than those of the individual. Also, the wide mesophase regions of the present series are identified compared to those of the constituent mesogens. The optical tilt angle of binary mixtures for smectic C phase and thermal stability factors of the mesogenic phases have been discussed.

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Acknowledgments

One of the authors (VN Vijayakumar) acknowledges the financial support rendered by Department of Science and Technology (DST), New Delhi, and Department of Atomic Energy-Board of Research in Nuclear Science (DAE-BRNS), Mumbai, and infrastructural support provided by Bannari Amman Institute of Technology is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Physics, Star Lion College of Engineering and Technology, Thanjavur, 614 206, India

    T. Ranjeeth kumar

  2. Department of Physics, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology, Sathyamangalam, 638 401, India

    S. Sundaram, T. Vasanthi, P. Subhasri, R. Jayaprakasam & V. N. Vijayakumar

  3. Department of Physics, Erode Sengunthar Engineering College, Perundurai, Erode, 638 057, India

    S. Sundaram & T. S. Senthil

  4. Department of Physics, Anna University Engineering College, Ramanathapuram, 623 513, India

    T. Chitravel

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  1. T. Ranjeeth kumar
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Correspondence to V. N. Vijayakumar.

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Ranjeeth kumar, T., Sundaram, S., Vasanthi, T. et al. Investigation on Thermal and Optical Properties of Hydrogen-Bonded Binary Liquid Crystals. Braz J Phys 46, 649–657 (2016). https://doi.org/10.1007/s13538-016-0463-y

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  • DOI: https://doi.org/10.1007/s13538-016-0463-y

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