Synthesis and Mesogenic Properties of Novel Terthiophene Derivatives

Abstract

To develop novel oligothiophene‐based liquid crystals involving hydrogen bonding, new terthiophene derivatives containing a stearylamide group, N,N′‐distearyl‐5,5″‐dicyano‐2,2′∶5′,2″‐terthiophene‐4,4″‐dicarboxamide (DNC₁₈DCN 3T) and N,N′‐distearyl‐5,5′‐dipropyl‐2,2′∶5′,2′‐terthiophene‐4,4″‐dicarboxamide (DNC₁₈ DP3T), were designed and synthesized, and their thermal behavior examined. Although DNC₁₈DP3T did not exhibit liquid crystallinity, DNC₁₈DCN3T was found to form smectic A phase.

Keywords:

• Liquid crystal
• terthiophene derivatives

Acknowledgments

This work was supported by the Ministry of Education of the People's Republic of China (Research Funds for Chinese Scholars Returning from Abroad) and the Ministry of Science and Technology of the People's Republic of China (National Key Program for Basic Research, 2001‐CCA03500). We also thank the Natural Science Foundation of Guangdong (04105931) and Guangzhou for financial support.