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Title
Japanese: 
English:Innovative molecular design of bridged biphenyls for calamitic nematic liquid crystals with extensive π-conjugated mesogens 
Author
Japanese: 下村 祥通, 飯田 優斗, 鶴巻 英治, 小西玄一.  
English: Yoshimichi Shimomura, Yuto Iida, Eiji Tsurumaki, Gen-ichi Konishi.  
Language English 
Journal/Book name
Japanese: 
English:Materials Chemistry Frontier 
Volume, Number, Page Vol. 9       
Published date Feb. 14, 2025 
Publisher
Japanese: 
English:Royal Society of Chemistry 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1039/D4QM01116C
Abstract To develop advanced materials based on calamitic nematic liquid crystals, it is essential to design functional optoelectronic mesogens that can form nematic phases at low temperatures. This study proposes a new molecular design strategy for low-temperature nematic liquid crystals using large π-conjugated mesogens with optical/electrical functions. Bridged biphenyls were synthesized by bridging the two phenyl rings with propylene. This bridging structure reduced the molecular planarity and prevented the molecules from aligning neatly in one direction, resulting in lowering the temperature range of the nematic phases. Terphenyl and phenyltolane derivatives exhibited supercooled nematic phases at room temperature, while quarterphenyl and bis(phenylethynyl)-biphenyl derivates exhibited nematic phases below 100 °C. The proposed design is more effective for rigid mesogens compared to conventional calamitic nematic liquid crystal design.

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