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Title
Japanese: 
English:Development of 2,1,3-benzothiadiazole-based Room-temperature Fluorescent Nematic Liquid Crystals 
Author
Japanese: Suhail, Shimomura, Takuya Tanaka, 梶谷 孝, 小西玄一.  
English: Muhammad Suhail Uzair, Yoshimichi Shimomura, Takuya Tanaka, Kajitani, Gen-ichi Konishi.  
Language English 
Journal/Book name
Japanese: 
English:Molecules 
Volume, Number, Page Vol. 30    No. 11    p. 2438
Published date June 2, 2025 
Publisher
Japanese: 
English:MDPI 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://doi.org/10.3390/molecules30112438
 
DOI https://doi.org/10.3390/molecules30112438
Abstract Fluorescent liquid crystals (LCs) have attracted considerable interest owing to their unique combination of fluidity, anisotropy, and intrinsic emission. However, most reported fluo-rescent LCs exhibit high phase transition temperatures and/or smectic phases, limiting their practical applications. To address this, we designed and synthesized a series of 2,1,3-benzothiadiazole (BTD)-based fluorescent nematic liquid crystals incorporating do-nor (D) or acceptor (A) groups to form D–A–D or D–A–A structures. Most of the synthe-sized derivatives exhibited supercooled nematic phases at room temperature. They com-posed various functional groups, such as secondary alkylamine, branched alkyl chain, and trifluoroacetyl groups, which are rarely used in calamitic nematic LCs. Notably, di-methylamine- and carbonyl-substituted derivatives exhibited relatively high fluorescence quantum yields (Φfl) in both solid and mesophase states, demonstrating their potential as efficient fluorescent materials. Our findings underscore the versatility of BTD-based mesogenic skeletons for designing room-temperature fluorescent nematic LCs with vari-ous functional groups. These materials offer promising opportunities for next-generation display technologies, optical sensors, and photonic applications.

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