Affiliation:
1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry Jilin University Changchun 130012 China
2. State Key Laboratory of Superhard Materials, College of Physics Jilin University Changchun 130012 P. R. China
3. Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences 189 Songling Road Qingdao 266101 P. R. China
4. Normandie Univ ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie 6 Marechal Juin 14050 Caen France
Abstract
AbstractPiezochromic 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.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Higher Education Discipline Innovation Project
China Postdoctoral Science Foundation
Subject
General Chemistry,Catalysis
Cited by
30 articles.
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