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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Stable 2D Heteroporous Covalent Organic Frameworks for Efficient Ionic Conduction.

Zhen Xie1, Bo Wang1, Zongfan Yang1

  • 1Department of Chemistry, Institute of Molecular Plus, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China.

Angewandte Chemie (International Ed. in English)
|August 22, 2019
PubMed
Summary

This study introduces a stable dibenzo[g,p]chrysene-based covalent organic framework (COF) for ionic conduction. The new COF-polymer composite shows excellent chemical stability and high ionic conductivity, paving the way for advanced materials.

Keywords:
covalent organic frameworkshybrid materialsionic conductivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Two-dimensional (2D) covalent organic frameworks (COFs) possess ordered nanochannels suitable for guest incorporation.
  • The practical application of COFs is limited by the chemical instability of their dynamic covalent linkages.

Purpose of the Study:

  • To synthesize a highly crystalline and stable dibenzo[g,p]chrysene-based COF (DBC-2P) for use as a host material.
  • To develop a COF-polymer composite for enhanced ionic conduction.

Main Methods:

  • Synthesis of a heteroporous dibenzo[g,p]chrysene-based COF (DBC-2P).
  • Post-synthetic encapsulation of linear polyethylene glycol (PEG) and PEG-LiBF4 salt into the COF nanochannels.
  • Evaluation of the chemical stability and ionic conductivity of the resulting hybrid material.

Main Results:

  • The synthesized DBC-2P exhibited excellent stability in both strong acid and base conditions.
  • The DBC-2P/PEG-LiBF4 hybrid material achieved a high ionic conductivity of 2.31×10⁻³ S cm⁻¹.
  • The study demonstrated an effective post-synthetic strategy for creating COF-polymer composites.

Conclusions:

  • Dibenzo[g,p]chrysene-based COFs offer enhanced chemical stability due to reinforced interlayer interactions.
  • COF-polymer composites can be efficiently developed for applications requiring high ionic conductivity.
  • This work presents a promising route for designing robust COF-based functional materials.