Synthesis and Characterization of Bowl-Shaped Liquid Crystals with a Core of Calix[6]arene

Abstract:

A new kind of bowl-shaped liquid crystals were designed and synthesized by esterification. They used a calix[6]arene as central unit and ω- cholesteric alkyl diacid monoester as mesogenic arms. Their chemical structures were confirmed by FTIR and 1HNMR spectra, their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-Ray Diffraction (XRD) measurements. The results showed that the kind of calix[6]arene bowl-shaped liquid crystals N1-N3 exhibited broad range liquid crystalline phases at moderate temperature, and they displayed cholesteric phase focal-conic texture in liquid crystal states. With increasing the flexibility of monomers M1-M3, the melting point and the clearing temperature decreased in the macromolecules.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 2202-2205
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.2202
• Online since: November 2011
• Authors: Dan Shu Yao, Feng Li, Hao Jie Wang, Xiao Yun Li, Mei Tian, Ai Juan Zhou, Jian She Hu
• Keywords: Calix[6]Arene, Liquid Crystal, Phase Behaviour, Synthesis

References

[1] T. Uragami, T. Meotoiwa and T. Miyata: Macromolecules Vol. 36(2003), p. (2041)

[2] P.D. Barata and I. Alexandra: React. Funct. Polym. Vol. 61(2004), p.147

[3] I. Oueslati: Tetrahedron Vol. 63(2007), p.10840

[4] D.S. Yao, B.Y. Zhang, W.W. Zhang and M. Tian: J. Mol. Struct. Vol. 881(2008), p.83

[5] G.H. Mehl, A.J. Thornton and J.W. Goodby: Mol. Cryst. Liq. Cryst.Vol. 32(1999), p.455

[6] K. Yonetake, T. Masuko, T. Morishita, K. Suzuki, M. Ueda and R. Nagahata: Macromolecules Vol. 32(1999), p.6578

DOI: 10.1021/ma990107a

[7] K. Yonetake, T. Nakayama and M. Ueda: J. Mater. Chem. Vol. 11(2001), p.761

[8] S. Kohmoto, Y. Someya, H. Masu, K. Yamaguchi and K. Kishikawa: J. Org. Chem. Vol. 71(2006), p.4511