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Regulating Both In-Plane and Out-Of-Plane Supramolecular Interactions in COFs for Simultaneously Enhanced

Pengcheng Wu1, Ke Wang1, Liancheng Hu1

  • 1Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu, Sichuan, China.

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PubMed
Summary

Researchers developed a new method to enhance the crystallinity and stability of covalent organic frameworks (COFs) for high-performance applications. This approach improves COF properties for demanding uses, like separating palladium from nuclear waste.

Keywords:
covalent organic frameworkcrystallinitynoncovalent interactionsstabilitysupramolecular chemistry

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • High-performance applications of covalent organic frameworks (COFs) require exceptional crystallinity and stability.
  • Achieving both high crystallinity and stability simultaneously is challenging due to contradictory structural requirements.
  • Existing COF designs often compromise one property for the other.

Purpose of the Study:

  • To develop a novel multidimensional supramolecular approach to enhance both crystallinity and stability in COFs.
  • To investigate the impact of in-plane and out-of-plane interactions on COF structural integrity and performance.
  • To demonstrate the improved capabilities of the engineered COFs in demanding applications.

Main Methods:

  • Introduction of triple three-center hydrogen bonds to enhance in-plane rigidity and planarity.
  • Embedding electron-withdrawing heteroatoms in linkers to reduce out-of-plane electrostatic repulsion.
  • Utilizing a hybrid supramolecular strategy integrating these features into a single COF structure.

Main Results:

  • The engineered COFs exhibited significantly enhanced interlayer π-π stacking interactions.
  • Profoundly higher crystallinity and stability were observed compared to control COFs.
  • Demonstrated superior performance in harsh conditions, exemplified by palladium separation from simulated high-level liquid waste.

Conclusions:

  • A hybrid supramolecular approach effectively manipulates in-plane and out-of-plane interactions to improve COF crystallinity and stability.
  • The enhanced COFs show great promise for high-performance applications under harsh conditions.
  • This work provides a new strategy for designing robust and crystalline COFs.