A series of disk-rod-disk liquid crystal trimers were synthesized.CuI-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature connected two triphenylene discogens to a biphenyl rod-shaped mesogen.The ...A series of disk-rod-disk liquid crystal trimers were synthesized.CuI-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature connected two triphenylene discogens to a biphenyl rod-shaped mesogen.The trimers were characterized by using 1H NMR,IR,and high resolution mass spectrometry.The mesomorphic properties were investigated using polarized optical microscopy(POM) ,differential scanning calorimetry(DSC) ,and wide-angle X-ray diffraction.The results showed that the trimers exhibited rectangular columnar mesophase(Colr) .The length of the flexible spacer connecting the three segments has prominent influence on the phase transition temperatures of the trimers.展开更多
The hydrogen-bonded supramolecular complexes（Fn and 2F6） were prepared by the complexation of carboxylic acid derivatives and 4,4′-bipyridine.The IR spectroscopic study on Fn and 2F6 shows that they were formed thr...The hydrogen-bonded supramolecular complexes（Fn and 2F6） were prepared by the complexation of carboxylic acid derivatives and 4,4′-bipyridine.The IR spectroscopic study on Fn and 2F6 shows that they were formed through single hydrogen bonding between —COOH and pyridyl groups.Fn showed a nematic state,while no liquid crystalline behaviour was observed for 2F6.展开更多
基金supported by the National Natural Science Foundation of China(20872104,50673069 and 50973076)
文摘A series of disk-rod-disk liquid crystal trimers were synthesized.CuI-NEt3 catalyzed alkyne azide cycloaddition in toluene at room temperature connected two triphenylene discogens to a biphenyl rod-shaped mesogen.The trimers were characterized by using 1H NMR,IR,and high resolution mass spectrometry.The mesomorphic properties were investigated using polarized optical microscopy(POM) ,differential scanning calorimetry(DSC) ,and wide-angle X-ray diffraction.The results showed that the trimers exhibited rectangular columnar mesophase(Colr) .The length of the flexible spacer connecting the three segments has prominent influence on the phase transition temperatures of the trimers.
文摘The hydrogen-bonded supramolecular complexes（Fn and 2F6） were prepared by the complexation of carboxylic acid derivatives and 4,4′-bipyridine.The IR spectroscopic study on Fn and 2F6 shows that they were formed through single hydrogen bonding between —COOH and pyridyl groups.Fn showed a nematic state,while no liquid crystalline behaviour was observed for 2F6.
