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Title
Japanese: 
English:Supramolecular liquid crystals from the dimer of L-shaped molecules with tertiary amide end groups 
Author
Japanese: 猿渡 悠生, 下村 祥通, 竹内 雅人, 岩井 梨輝, 田中 拓哉, 鶴巻 英治, 戸木田 雅利, 渡辺 順次, 小西玄一.  
English: Yuki Sawatari, Yoshimichi Shimomura, Masato Takeuchi, Riki Iwai, Takuya Tanaka, Eiji Tsurumaki, Masatoshi Tokita, Junji Watanabe, Gen-ichi Konishi.  
Language English 
Journal/Book name
Japanese: 
English:Aggregate 
Volume, Number, Page Vol. 5        Page e507
Published date Jan. 7, 2024 
Publisher
Japanese: 
English:Wiley 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://onlinelibrary.wiley.com/doi/10.1002/agt2.507
 
DOI https://doi.org/10.1002/agt2.507
Abstract Supramolecular liquid crystals (SLCs) are attractive materials for fabricating devices with new optoelectronic functions. Conventional SLCs are made from hydrogen-bonded mesogens. However, these mesogens suffer from high melting points, and the types of formable aggregates are limited owing to the directionality of the hydrogen bonding. Therefore, to fabricate non-hydrogen-bonded SLCs, we hypothesized that the introduction of tertiary amide groups into calamitic molecules would be advantageous because they have an L-shaped structure with N- or C-alkyl side chains not aligned along the long axis, and the flexibility to undergo cis–trans isomerization. In this study, we developed a novel non-hydrogen-bonded SLC by assembling an L-shaped dimer composed of the calamitic molecules (phenyltolanes) with tertiary amides at their ends. These molecules exhibited a smectic B phase. The phase transition temperature of the SLCs from crystal to liquid crystal phase was low despite the long π-conjugated core. Wide-angle X-ray diffraction and variable-temperature Fourier-transform infrared measurements revealed dimer formation by weak intermolecular interactions, i.e., the molecular recognition of L-shaped molecules, and mobility of the alkyl groups attached to amide driven by cis–trans isomerization in the liquid crystal phase. Thus, cis–trans isomerization of tertiary amides contributed enormously to the formation and lower clearing points of this SLC. The developed method can be used not only to develop non-hydrogen-bonded SLCs but also to develop novel soft matter with controlled properties by incorporating the SLCs, as the aggregates can be controlled to impart desired functionalities.

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