首页|Synthesis and mesomorphism of rigid bridge triphenylene discotic liquid crystal dimers
Synthesis and mesomorphism of rigid bridge triphenylene discotic liquid crystal dimers
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NETL
NSTL
Trans Tech Publications Ltd
Pd-Cu catalyzed homocoupling reaction has been used for the synthesis of symmetrical triphenylene discotic liquid crystal dimers, [C_(18)H_6(OC_nH_(2n+1))_5(O_2CC_6H_4C≡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.
NETL
NSTL
Trans Tech Publications Ltd
