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Ester-Linked Crystalline Covalent Organic Frameworks.

Chenfei Zhao1, Hao Lyu1, Zhe Ji1

  • 1Department of Chemistry, Kavli Energy Nanoscience Institute, and Berkeley Global Science Institute, University of California-Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|August 14, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized crystalline, porous covalent organic frameworks (COFs) using ester linkages. This breakthrough expands reticular chemistry and offers new materials for porous applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Crystallography

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers.
  • Existing COFs often utilize linkages other than esters.
  • Achieving large, ordered structures in COFs is a significant challenge.

Purpose of the Study:

  • To synthesize and characterize novel ester-linked crystalline covalent organic frameworks (COFs).
  • To explore the potential of transesterification reactions for COF synthesis.
  • To expand the scope of reticular chemistry to include ester-linked COFs.

Main Methods:

  • Transesterification reactions between ditopic 2-pyridinyl aromatic carboxylates and tri- or tetratopic phenols.
  • Crystallization of the resulting ester-linked COFs.
  • Structural characterization using X-ray diffraction and surface area analysis.

Main Results:

  • Successful synthesis of ester-linked, crystalline, porous COFs (COF-119 to COF-122).
  • COFs were obtained in kgm and hcb topologies with high surface areas up to 2092 m²/g.
  • COF-122 exhibited extended crystalline edges, comparable to metal-organic frameworks.

Conclusions:

  • This work demonstrates the first synthesis of crystalline ester-linked COFs.
  • The findings broaden the applicability of reticular chemistry principles.
  • The developed COFs are structurally related to common polyesters, opening new material design avenues.