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Piezochromism in Dynamic Three-Dimensional Covalent Organic Frameworks.

Jing Fang1, Zhiyuan Fu2, Xiaohong Chen1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry, Jilin University, Changchun, 130012, China.

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Summary

Two novel dynamic covalent organic frameworks (COFs) demonstrate exceptional piezochromic properties. JUC-635 exhibits reversible, high-contrast fluorescence changes under pressure, paving the way for advanced sensors.

Keywords:
Covalent Organic FrameworksFluorescenceHigh-ContrastPiezochromicPressure

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Piezochromic materials change luminescence under pressure, crucial for sensors and security.
  • Covalent organic frameworks (COFs) offer tunable properties but are underexplored for piezochromism.

Purpose of the Study:

  • To design and investigate novel dynamic 3D COFs for piezochromic applications.
  • To explore the pressure-dependent photoluminescence behavior of COFs based on AIE and ACQ chromophores.

Main Methods:

  • Synthesis of two dynamic 3D COFs, JUC-635 and JUC-636.
  • Utilizing diamond anvil cell technique to apply and measure pressure effects.
  • Characterizing photoluminescence and solvatochromism properties.

Main Results:

  • JUC-635, an AIE-based COF, shows sustained fluorescence and reversible piezochromism up to 12 GPa.
  • Achieved a high-contrast emission difference (Δλem = 187 nm) under pressure.
  • Demonstrated distinct solvatochromism and aggregation behavior for JUC-635.

Conclusions:

  • This study introduces JUC-635 and JUC-636 as promising piezochromic materials.
  • Highlights the potential of dynamic COFs for advanced pressure sensing and signal switching applications.
  • Establishes a new direction for COF material development in responsive technologies.