Synthesis and liquid crystal properties of a novel family of oligothiophene derivatives |
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| Authors: | Ping Liu Yamin Zhang Jianhua Hu Qizhong Zhao Zhen Tong |
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| Institution: | a Polymer Structure and Modification, Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
b Department of Applied Physics, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | In order to develop novel oligothiophene-based liquid crystals capable of hydrogen bonding, new terthiophene derivatives containing an alkylamide group, N,N′-dialkyl-5,5″-dichloro-2,2′:5′,2″-terthiophene-4,4″-dicarboxamide (DNCnDCl3T, n=8, 18), N,N′-dialkyl-5,5″-dibromo-2,2′:5′,2″-terthiophene-4,4″-dicarboxamide (DNCnDBr3T, n=5, 8, 16, 18), or N,N′-dialkyl-5,5″-diiodo-2,2′:5′,2″-terthiophene-4,4″-dica-rboxamide (DNCnDI3T, n=8, 18), were designed and synthesized, and their thermal behaviour was examined. It was found that DNC18DCl3T, DNC18DI3T and DNCnDBr3T (n=8, 16, 18) form a smectic A phase and that the alkyl chain length greatly affects liquid crystal phase formation. The absence of liquid crystallinity in the corresponding ester derivatives suggests that intermolecular hydrogen bonding also plays a role in the formation of a liquid crystal phases in the DNCnDBr3T system. |
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| Keywords: | Oligothiophene derivatives Liquid crystal Intermolecular hydrogen bonding |
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