Acta Chimica Sinica ›› 2003, Vol. 61 ›› Issue (5): 774-779. Previous Articles     Next Articles

Original Articles

新型低聚噻吩衍生物的设计、合成及其液晶性能的研究

刘平;周小平;胡建华;赵其中;邓文基;童真;许运华;万梅香   

  1. 华南理工大学材料所;华南理工大学应用物理系;中国科学院化学研究所
  • 发布日期:2003-05-15

Synthesis and Liquid Crystal Properties of a Novel Class of Oligothiophene Derivatives

Liu Ping;Zhou Xiaoping;Hu Jianhua;Zhao Qizhong;Deng Wenji;Tong Zhen;Xu Yunhua;Wan Meixiang   

  1. Research Institute of Materials Science, South China University of Technology;Department of Applied Physics, South China University of Technology;Institute of Chemistry, Chinese Academy of Sciences
  • Published:2003-05-15

With the aim of developing new oligothiophene-based liquid crystals involving hydrogen bonding, new terthiophene derivatives containing an alkylamide group, N,iV'-dialkyl-5,5"-dibromo-2,2':5',2"-terthiophene-4, 4"-dicarboxamide (DNCnDBr3T, n = 5, 8, 16, 18), were designed and synthesized, and their thermal behaviors were examined. While DNCnDBr3T compounds with n = 8, 16, 18 were found to form smectic A phase, DNC5DBr3T did not form liquid crystal phase. In addition to liquid crystal behavior, crystal polymorphism was also observed for DNCigDBr3T. It is shown 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 plays a role in the formation of liquid crystal phase in the DNCnDBr3T system.

Key words: THIOPHENE P, POLYMER, LIQUID CRYSTAL, HYDROGEN BONDS, IR, DSC, AMIDES

CLC Number: