Synthesis and Mesomorphism of Rigid Bridge Triphenylene Discotic Liquid Crystal Dimers

Abstract:

Article Preview

Pd-Cu catalyzed homocoupling reaction has been used for the synthesis of symmetrical triphenylene discotic liquid crystal dimers, [C18H6(OCnH2n+1)5(O2CC6H4C≡C-)]2 (n = 4, 5, 6, 7, 8, 9), which connected two triphenylene discogens via a long rigid spacer. The purity and structure of monomers and dimers have been characterized with 1H NMR, IR and high resolution Mass. Their fine thermal stability has been confirmed by the results of thermogravimetry analysis (TGA). Polarized optical microscopy (POM) and differential scanning calorimetry (DSC) results have shown that the monomers and dimers exhibit columnar mesophases (Col). The dimers display wide mesophase ranges and are room temperature liquid crystals, and their clearing points increased with the lengthening of peripheral alkyl chain.

Info:

Periodical:

Key Engineering Materials (Volumes 428-429)

Edited by:

Yuan Ming Huang

Pages:

41-45

DOI:

10.4028/www.scientific.net/KEM.428-429.41

Citation:

H. Zhou et al., "Synthesis and Mesomorphism of Rigid Bridge Triphenylene Discotic Liquid Crystal Dimers", Key Engineering Materials, Vols. 428-429, pp. 41-45, 2010

Online since:

January 2010

Export:

Price:

$35.00

[1] S. Kumar: Chem. Soc. Rev. Vol. 35 (2006), p.83.

[2] C. Xing, J. W. Y. Lam, K. Zhao and B. Z. Tang: J. Polym. Sci. Part A: Polym. Chem. Vol. 46 (2008), p.2960.

[3] L. Y. Park, D. G. Hamilton, E. A. McGehee and K. A. McMenimen: J. Am. Chem. Soc. Vol. 125 (2003), p.10586.

[4] N. Katsonis, A. Marchenko and D. Fichou: J. Am. Chem. Soc. Vol. 125 (2003), p.13682.

[5] G. Heppke, D. KruÈerke, C. LoÈhning, D. LoÈtzsch, D. Moro, M. MuÈller and H. Sawade: J. Mater. Chem. Vol. 10 (2000), p.2657.

[6] X. Ma, Y. Yang, C. Wang and K. J. Zhao: Nanosci. Nanotechnol. Vol. 9 (2009), p.1148.

[7] X. Ma, Y. Li, X. Qiu, K. Zhao, Y. Yang and C. Wang: J. Mater. Chem. Vol. 19 (2009), p.1490.

[8] X. Ma, Y. Yang, K. Deng, Q. Zeng, K. Zhao, C. Wang and C. J. Bai: Mater. Chem. Vol. 18 (2008), p. (2074).

[9] M. Li, Y. -L. Yang, K. -Q. Zhao, Q. -D. Zeng and C. J. Wang: Phys. Chem. C Vol. 112 (2008), p.10141.

[10] X. -J. Ma, Y. -L. Yang, K. Deng, Q. -D. Zeng, C. Wang, K. -Q. Zhao, P. Hu and B. -Q. Wang: Chem Phys Chem, Vol. 8 (2007) , p.2615.

[11] A. P. Melissaris and M. H. J. Litt: Org. Chem., Vol. 57(1992), p.6998.

[12] X. M. Xing, J. W. Y. Lam, K. Q. Zhao and B. Z. J. Tang: Polym. Sci.: Part A: Polym. Chem. Vol. 46 (2008), p.2960.

[13] A. W. Lei, M. Srivastava and X. M. J. Zhang: Org. Chem. Vol. 67 (2002), p. (1969).

[14] S. Kumar and S. K. Varshney: Org. Lett. Vol. 4 (2002), p.157.

In order to see related information, you need to Login.