https://doi.org/10.65770/VNFC9007
ABSTRACT
A new azo-based liquid crystalline compound, 4-(4’-n-alkoxy-3’-methoxy cinnamyloxy) phenyl azo-5’’-(2’’-cyano-3’’-trifluoromethyl) pyridine, was synthesized and characterized. The structure was confirmed by elemental analysis, FT-IR, and NMR spectroscopy. The molecular design, incorporating azo and ester linkages along with polar –CN and –CF₃ substituents on the pyridine ring, enhances molecular anisotropy and intermolecular interactions. Mesomorphic properties studied by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) revealed the presence of stable nematic and smectic phases. The results indicate that these compounds exhibit good thermal stability and are promising for applications in liquid crystal and photonic devices.
References
- [1] Kumar Choudhury and A.-B. M.A. Ibrahim, “Introductory Chapter: Liquid Crystals and Applications,” in Liquid Crystals, P. Kumar Choudhury and A.-B. M.A. Ibrahim, Eds., IntechOpen, 2022. doi: 10.5772/intechopen.105105.
- [2] K. Bisoyi and Q. Li, “Liquid Crystals: Versatile Self-Organized Smart Soft Materials,” Chem. Rev., vol. 122, no. 5, pp. 4887–4926, Mar. 2022, doi: 10.1021/acs.chemrev.1c00761.
- [3] Khatun, A. C. Nkele, and K. Bagchi, “Liquid crystals as solid-state templates,” Phys. Chem. Chem. Phys., vol. 27, no. 13, pp. 6408–6424, 2025, doi: 10.1039/D4CP04526B.
- [4] P. Zuhail, M. Humar, and S. Dhara, “Effect of phase transitions on liquid crystal colloids: a short review,” Liquid Crystals Reviews, vol. 8, no. 1, pp. 44–57, Jan. 2020, doi: 10.1080/21680396.2021.1904298.
- [5] -H. Chen and I. Dierking, “Nanoparticles in thermotropic and lyotropic liquid crystals,” Front. Soft Matter, vol. 4, p. 1518796, Jan. 2025, doi: 10.3389/frsfm.2024.1518796.
- [6] Kato, T., Uchida, J., Ichikawa, T., & Sakamoto, T. (2022). Functional liquid crystals towards the next generation of materials. Angewandte Chemie International Edition, 61(22), e202200123.
https://doi.org/10.1002/anie.202200123 - [7] Lee, K. M., Marsh, Z. M., Crenshaw, E. P., Tohgha, U. N., Ambulo, C. P., Wolf, S. M., … Godman, N. P. (2023). Recent advances in electro-optic response of polymer-stabilized cholesteric liquid crystals. Materials, 16(6), 2248. https://doi.org/10.3390/ma16062248
- [8] Wu, H., Jiang, Y., Hu, W., Feng, S., & Li, J. (2023). Effect of mesogenic phase and structure of liquid crystals on tribological properties as lubricant additives. Coatings, 13(1), 168.
https://doi.org/10.3390/coatings13010168 - [9] Tschierske, C. (2023). Development of structural complexity by liquid-crystal self-assembly. Chemical Society Reviews, 52(3), 1234–1302. https://doi.org/10.1039/D2CS00745A
- Patel, R. B., Doshi, A. V., & Vyas, N. N. (2022). Synthesis and mesomorphic properties of azo ester-based liquid crystals: Effect of terminal substituents. Liquid Crystals, 49(8), 987–998.
https://doi.org/10.1080/02678292.2022.2045678 - Lee, K. M., Marsh, Z. M., Crenshaw, E. P., Tohgha, U. N., Ambulo, C. P., Wolf, S. M., … Godman, N. P. (2023). Recent advances in electro-optic response of polymer-stabilized cholesteric liquid crystals. Materials, 16(6), 2248. https://doi.org/10.3390/ma16062248
- Kim, Y., & Lee, M. (2022). Supramolecular liquid crystals: from thermotropic to lyotropic systems. Materials Horizons, 9(6), 1500–1520. https://doi.org/10.1039/D2MH00123K
- Ahmed, H. A., Naoum, M. M., & Saad, G. R. (2023). Mesophase behavior of new Schiff base/ester liquid crystals: Impact of molecular structure. Crystals, 13(2), 245. https://doi.org/10.3390/cryst13020245
- Aziz, T., Nasim, H. A., Ahmad, K., Shah, H. U. R., Parveen, S., Ahmad, M. M., et al. (2022) Rational synthesis and biological evaluation of azo derivatives of phenylcarbonyl diazinyl heterocycles. Heliyon, 9(1), e12492. https://doi.org/10.1016/j.heliyon.2022.e12492
- Xiong, D., Xiong, X., Chen, Z., Yu, W., & Feng, C. (2022). Mesophase behaviour of 1,2,3-triazole-based nematic liquid crystals influenced by varying alkyl chains and halogen atom substitution. Liquid Crystals, 49(10), 1–12. https://doi.org/10.1080/02678292.2022.2066731
Download all article in PDF
ADVERTISEMENT
