Synthesis and Mesomorphism of Rigid Bridge Triphenylene Discotic Liquid Crystal Dimers

Hui Zhou; Wen Hao Yu; Bi Qin Wang; Ping Hu; Ke Qing Zhao

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

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 428-429Synthesis and Mesomorphism of Rigid Bridge...

Synthesis and Mesomorphism of Rigid Bridge Triphenylene Discotic Liquid Crystal Dimers

Abstract:

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.

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Key Engineering Materials (Volumes 428-429)

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41-45

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https://doi.org/10.4028/www.scientific.net/KEM.428-429.41

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January 2010

Authors:

Hui Zhou, Wen Hao Yu, Bi Qin Wang, Ping Hu, Ke Qing Zhao

Keywords:

Dimers, Discotic Liquid Crystal, Mesomorphism, Triphenylene Discogen

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