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Liquid crystals based on calix[4]arene Schiff bases

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Abstract

New liquid crystals based on calix[4]arene Schiff base were prepared by the reaction of tetraamino-calix[4]arene with aldehydes (4-hydroxy benzaldehyde, 2-vanillin, 4-vanillin and 2-hydroxy naphthaldehyde). Dielectric investigations on a magnetically oriented sample forming N, SmA, and SmC phases were carried out. The dielectric constant (ε’ and ε”) and dielectric loss (tan δ) have been determined as a function of frequency (20 Hz–2 MHz). The synthesized derivatives were purified and characterized by FT-IR, 1H-NMR, 13C-NMR and MALDI-TOF MS. All the synthesized compounds were investigated for liquid crystalline properties using DSC (Differential Scanning Calorimetry), DTA (Differential Thermal Analysis) and POM (Polarizing Optical Microscopy) attached with a hot stage. They generally exhibited nematic and typical fanlike or mosaic texture, which suggest the ordered smectic mesophases. Compounds were found to adopt a specific molecular structure due to the rigid bowl like calix[4]arene core, i.e., a cone-like structure with mesogenic units aligned within the molecule.

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Acknowledgments

Financial assistance from UGC, New Delhi is gratefully acknowledged. The authors wish to thank Lucknow for spectral data.

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Authors and Affiliations

  1. Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, 380009, India

    Ravindra V. Patel, Jayesh G. Panchal & Shobhana K. Menon

  2. Department of Physics, School of Sciences, Gujarat University, Ahmedabad, 380009, India

    V. A. Rana

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  1. Ravindra V. Patel
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  2. Jayesh G. Panchal
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  3. V. A. Rana
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  4. Shobhana K. Menon
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Correspondence to Shobhana K. Menon.

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Patel, R.V., Panchal, J.G., Rana, V.A. et al. Liquid crystals based on calix[4]arene Schiff bases. J Incl Phenom Macrocycl Chem 66, 285–295 (2010). https://doi.org/10.1007/s10847-009-9620-z

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  • DOI: https://doi.org/10.1007/s10847-009-9620-z

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