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Piezochromism in Dynamic Three-Dimensional Covalent Organic Frameworks |
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| Authors: | Jing Fang Zhiyuan Fu Xiaohong Chen Yaozu Liu Fengqian Chen Dr Yujie Wang Dr Hui Li Dr Yusran Yusran Prof Kai Wang Prof Valentin Valtchev Prof Shilun Qiu Prof Bo Zou Prof Qianrong Fang |
| Institution: | 1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry, Jilin University, Changchun, 130012 China
These authors contributed equally to this work.;2. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012 P. R. China These authors contributed equally to this work.;3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry, Jilin University, Changchun, 130012 China;4. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012 P. R. China;5. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, 266101 P. R. China Normandie Univ, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 6 Marechal Juin, 14050 Caen, France |
| Abstract: | Piezochromic materials with pressure-dependent photoluminescence tuning properties are important in many fields, such as mechanical sensors, security papers, and storage devices. Covalent organic frameworks (COFs), as an emerging class of crystalline porous materials (CPMs) with structural dynamics and tunable photophysical properties, are suitable for designing piezochromic materials, but there are few related studies. Herein, we report two dynamic three-dimensional COFs based on aggregation-induced emission (AIE) or aggregation-caused quenching (ACQ) chromophores, termed JUC-635 and JUC-636 (JUC=Jilin University China), and for the first time, study their piezochromic behavior by diamond anvil cell technique. Due to the various luminescent groups, JUC-635 has completely different solvatochromism and molecular aggregation behavior in the solvents. More importantly, JUC-635 with AIE effect exhibits a sustained fluorescence upon pressure increase (≈3 GPa), and reversible sensitivity with high-contrast emission differences (Δλem=187 nm) up to 12 GPa, superior to other CPMs reported so far. Therefore, this study will open a new gate to expand the potential applications of COFs as exceptional piezochromic materials in pressure sensing, barcoding, and signal switching. |
| Keywords: | Covalent Organic Frameworks Fluorescence High-Contrast Piezochromic Pressure |