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Highly Emissive Covalent Organic Frameworks.

Sasanka Dalapati1, Enquan Jin2, Matthew Addicoat3

  • 1Field of Energy and Environment, School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi 923-1292, Japan.

Journal of the American Chemical Society
|April 26, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed highly emissive covalent organic frameworks (COFs) using an aggregation-induced emission (AIE) mechanism, overcoming aggregation-caused quenching (ACQ) limitations. These AIE-COFs show high quantum yields and sensitive ammonia detection.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Covalent Organic Frameworks (COFs) typically suffer from aggregation-caused quenching (ACQ), limiting their luminescence properties.
  • Achieving highly luminescent COFs has been a significant challenge due to the π-π stacking in their layered structures.

Purpose of the Study:

  • To develop a general strategy for designing highly emissive COFs.
  • To overcome the limitations of ACQ in COFs by introducing an aggregation-induced emission (AIE) mechanism.

Main Methods:

  • Integration of AIE-active units into the vertices of COF structures.
  • Synthesis of crystalline porous COFs featuring periodic π-stacked columnar AIE arrays.
  • Characterization of luminescence properties and ammonia sensing capabilities.

Main Results:

  • Successfully designed and synthesized highly emissive COFs with integrated AIE units.
  • Columnar AIE π-arrays within the COFs dominate luminescence, exhibiting exceptional quantum yields.
  • Demonstrated highly sensitive ammonia detection down to sub-ppm levels using the AIE-COFs.

Conclusions:

  • The proposed strategy effectively overcomes ACQ-based limitations in COF luminescence.
  • This work opens new avenues for exploring and developing highly emissive COF materials.
  • The developed AIE-COFs show promise for sensitive chemical sensing applications.