Volume 134, Issue 1 e202113073
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Multi-Stimuli-Induced Mechanical Bending and Reversible Fluorescence Switching in a Single Organic Crystal

Prof. Dr. Xin Zheng

Corresponding Author

Prof. Dr. Xin Zheng

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Xiaojing Liu

Xiaojing Liu

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Lijie Liu

Lijie Liu

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Dr. Xiaochuan Li

Dr. Xiaochuan Li

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 P. R. China

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Song Jiang

Song Jiang

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Caoyuan Niu

Caoyuan Niu

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Puhui Xie

Puhui Xie

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Guoxing Liu

Guoxing Liu

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Zhanqi Cao

Zhanqi Cao

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Yunlai Ren

Yunlai Ren

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Yuchen Qin

Yuchen Qin

College of Science, Henan Agricultural University, Zhengzhou, 450002 P. R. China

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Prof. Dr. Jianji Wang

Prof. Dr. Jianji Wang

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 P. R. China

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First published: 22 November 2021
Citations: 4

Abstract

Fluorescent single crystals that respond to multiple external stimuli are of great interest in molecular machines, sensors, and displays. The integration of photo- or acid-induced fluorescence enhancement and bending in one organic crystal, however, has not been reported yet. Herein, we report the interesting plastic photomechanical bending and switching on of the fluorescence of an azine crystal in a single-crystal transformation, due to extended π-conjugation and molecular slippage. Moreover, the fluorescent plastic bending driven by multiple volatile acid vapors was firstly observed, and attributed to the synergistic effect of push–pull electronic structure and hydrogen bonding. The single crystal also shows high elasticity under external force. In addition, reversible fluorescence switching can be triggered by grinding and solvent fuming, as well as by the adsorption and desorption of HCl vapor. The integration of plastic, elastic bending and switch-on fluorescence into one single crystal provides a new strategy for next-generation smart materials.

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