作者：Bin Mu,Tianshu Ma,Zhelin Zhang,Xiangnan Hao,Liang Wang,Jingxia Wang,Hongxia Yan,and Wei Tian*
关键字：discotic mesogen, fluorescence, liquid crystals, mesophases, thermochromism
论文来源：期刊
具体来源：Chem. Eur. J. 2023, 29, e202300320
发表时间：2023年

    Most organic thermochromic fluorescent materials exhibit thermo-induced hypsochromic emission due to the formation of excimers in ordered molecular solids; however, it is still a challenge to endow them with bathochromic emission despite its significance in making up the field of thermochromism. Here, a thermo-induced bathochromic emission in columnar discotic liquid crystals is reported realized by intramolecular planarization of the mesogenic fluorophores. A three-armed discotic molecule of dialkylamino-tricyanotristyrylbenzene was synthesized, which preferred to twist out of the core plane to accommodate ordered molecular stacking in hexagonal columnar mesophases, giving rise to bright green monomer emission. However, intramolecular planarization of the mesogenic fluorophores occurred in isotropic liquid increasing the conjugation length, and as a result led to thermo-induced bathochromic emission from green to yellow light. This work reports a new concept in the thermochromic field and provides a novel strategy to achieve fluorescence tuning from intramolecular actions.

全文链接： https://doi.org/10.1002/chem.202300320