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Phase transition behavior of hydrogen bonded liquid crystal (6BA)2-(BPy) x as studied by 2H NMR

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Abstract

The thermal properties and the orientational order of hydrogen-bonded liquid crystals (6BA)2-(BPy)0.4 and (6BA)2-(BPy)0.3 (6BA: 4-n-hexylbenzoicacid, BPy: 4,4’-bipyridine) were investigated by DSC and 2H NMR. On cooling, isotropic liquid - liquid crystal phase transition temperatures were T C= 409 and 405 K for (6BA)2-(BPy)0.4 and (6BA)2-(BPy)0.3, respectively. Thermal anomalies in the liquid crystal phase were observed at T LC1= 402 and T LC2= 375 K for (6BA)2-(BPy)0.4 and at T LC1= 398 and T LC2= 375 K for (6BA)2-(BPy)0.3. For (6BA)2-(BPy)0.4, only the smectic component was created above T LC1. In addition, the nematic component was created below T LC1. The nematic component gradually changed to the smectic component with decreasing temperature and only the smectic component was observed below T LC2. For (6BA)2-(BPy)0.3, only the nematic component was created above T LC2. The phase transition from the nematic phase to the smectic phase took place at around T LC2.

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Authors and Affiliations

  1. Department of Chemistry, Graduate School of Natural Science & Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan

    M. Mizuno, K. Tabota, T. Oigawa, T. Miyatou, Y. Kumagai, R. Ohashi & T. Ida

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  1. M. Mizuno
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  2. K. Tabota
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  3. T. Oigawa
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  4. T. Miyatou
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  5. Y. Kumagai
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  6. R. Ohashi
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  7. T. Ida
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Corresponding author

Correspondence to M. Mizuno.

Additional information

This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016), Leuven, Belgium, 3-8 July 2016

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Mizuno, M., Tabota, K., Oigawa, T. et al. Phase transition behavior of hydrogen bonded liquid crystal (6BA)2-(BPy) x as studied by 2H NMR. Hyperfine Interact 237, 135 (2016). https://doi.org/10.1007/s10751-016-1324-3

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  • DOI: https://doi.org/10.1007/s10751-016-1324-3

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