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6910952 
Journal Article 
Design, synthesis, and self-assembly behavior of C-3-symmetry discotic molecules via click chemistry 
Ryu, MiHee; Choi, JinWoo; Cho, BKi; , 
2010 
Yes 
Journal of Materials Chemistry
ISSN: 0959-9428
EISSN: 1364-5501 
ROYAL SOC CHEMISTRY 
CAMBRIDGE 
1806-1810 
WOS:000274581000027 
We prepared a series of C-3-symmetry discogens with three 1,2,3-triazoles and a central benzene ring by a copper-catalyzed "click reaction'' between 1,3,5-triethynylbenzene and 3,4,5-trialkoxybenzyl azides. According to the differential scanning calorimetry (DSC) data, compounds with octyl and dodecyl peripheries showed stable liquid crystalline (LC) phases at room temperature, and upon heating underwent an isotropization at 105.3 degrees C and 92.2 degrees C, respectively. Compound with octadecyl peripheries melted into a LC phase at 63.5 degrees C, and changed into a disordered liquid at 84.4 degrees C. As characterized by optical polarized microscopy (POM) and X-ray scattering techniques, all LC phases revealed hexagonally packed columns, the axes of which are aligned vertically on the glass substrate. Interestingly, the experimentally accessible crystalline phase of the compound with octadecyl chains kept the 2-D hexagonal columnar structure, although the interdisc distance within the columns changed at the transition from the LC to crystalline phase.