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Dynamic two-dimensional covalent organic frameworks.

Florian Auras1,2, Laura Ascherl3, Volodymyr Bon4

  • 1Cavendish Laboratory, University of Cambridge, Cambridge, UK. florian.auras@tu-dresden.de.

Nature Chemistry
|May 3, 2024
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Summary
This summary is machine-generated.

Researchers developed dynamic covalent organic frameworks (COFs) with switchable pores. These flexible 2D COFs offer tunable optoelectronic properties, paving the way for stimuli-responsive materials.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Porous covalent organic frameworks (COFs) are typically rigid, limiting their functional adaptability.
  • Static frameworks restrict the dynamic modulation of material properties.
  • Developing flexible COFs is crucial for stimuli-responsive applications.

Purpose of the Study:

  • To design and synthesize dynamic two-dimensional (2D) COFs with controllable pore sizes.
  • To investigate the structural and optoelectronic responses of these dynamic COFs to guest molecules.
  • To establish a design strategy for creating robust, yet flexible, crystalline COFs.

Main Methods:

  • Utilized a 'wine rack' design strategy connecting rigid perylene diimide columns with flexible bridges.
  • Synthesized dynamic 2D COFs capable of reversible pore opening and closing.
  • Characterized structural transformations and optoelectronic properties using X-ray diffraction and spectroscopy.

Main Results:

  • Achieved stepwise phase transformations in COFs, altering unit-cell volume by up to 40%.
  • Demonstrated switchable optical absorption and emission characteristics in response to guest uptake/removal.
  • Observed monomer-like optical behavior in the contracted-pore state, approximating 'null-aggregates'.

Conclusions:

  • Introduced a novel design for dynamic 2D COFs with tunable porosity and stimuli-responsive properties.
  • The 'wine rack' architecture enables controlled flexibility for reversible structural changes.
  • These dynamic COFs represent a promising platform for advanced functional materials and optoelectronics.