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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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A Fully Saturated Covalent Organic Framework.

Junyu Ren1, Chunqing Ji1, Bowen Du1

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585 Singapore.

Journal of the American Chemical Society
|October 31, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed NUS-119, the first aliphatic covalent organic framework (COF), and NUS-120, the first fully saturated COF. These novel materials show excellent catalytic activity in condensation reactions, advancing COF applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Catalysis

Background:

  • Covalent Organic Frameworks (COFs) are crystalline porous polymers with tunable properties.
  • Aliphatic COFs are less explored due to synthetic challenges.
  • Imine-linkages are common in COF synthesis but can face monomer compatibility issues.

Purpose of the Study:

  • To synthesize and characterize the first aliphatic covalent organic framework (COF).
  • To develop a fully saturated COF through chemical modification.
  • To evaluate the catalytic performance of these novel COFs in base-catalyzed reactions.

Main Methods:

  • Design and synthesis of NUS-119 using imine-linkages and a Lewis acid modulator.
  • Conversion of NUS-119 to NUS-120, a fully saturated COF.
  • Structure elucidation using 3D microelectron diffraction (microED).
  • Assessment of catalytic activity in Knoevenagel condensation reactions.

Main Results:

  • Successful synthesis of NUS-119, the first aliphatic COF, with high crystallinity and porosity.
  • Creation of NUS-120, the first fully saturated COF.
  • Demonstrated high catalytic efficiency, conversion rates, and size selectivity for NUS-119 and NUS-120 in Knoevenagel condensations.
  • Exhibited good recyclability of the COF catalysts.

Conclusions:

  • This study reports the first aliphatic and fully saturated COFs, expanding the COF material class.
  • The developed COFs exhibit promising catalytic properties for organic synthesis.
  • The findings provide a foundation for future research into aliphatic COFs and their applications.