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Guest-Dependent Dynamics in a 3D Covalent Organic Framework.

Yichong Chen1, Zhao-Lin Shi1,2,3, Lei Wei1

  • 1School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.

Journal of the American Chemical Society
|January 19, 2019
PubMed
Summary
This summary is machine-generated.

This study reveals dynamic covalent organic frameworks (COFs) that contract or expand based on guest molecules. This structural adaptability enables controlled responses for designing advanced materials.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
  • Understanding guest-induced structural dynamics in COFs is crucial for their applications.
  • Previous studies have explored COF flexibility, but guest-dependent contraction and expansion remain less understood.

Purpose of the Study:

  • To investigate the guest-dependent structural dynamics of a 3D covalent organic framework (COF).
  • To elucidate the molecular mechanisms behind framework contraction and expansion upon guest inclusion.
  • To demonstrate the potential for rational design of dynamic COFs based on their adaptive behavior.

Main Methods:

  • Synthesis of a 3D covalent organic framework (COF) using a facile and scalable method.
  • Synchrotron in-house powder X-ray diffraction (PXRD) for structural analysis.
  • Rietveld refinements to determine crystal structure and guest-framework interactions.

Main Results:

  • The synthesized COF exhibits guest-dependent dynamics, showing both crystal contraction and expansion.
  • Upon moisture adsorption, the COF adopts a contracted phase.
  • Inclusion of organic solvents induces significant crystal expansion (up to 50% volume increase) and channel enlargement (3-fold).
  • Molecular-level understanding of node geometry and configuration changes driving these dynamics was achieved.

Conclusions:

  • The study demonstrates a dynamic COF with significant structural adaptability to various guests.
  • The findings provide insights into the mechanisms of contraction and expansion in COFs.
  • This work paves the way for the rational design and controlled application of dynamic COFs.