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Fluorescent Three-Dimensional Covalent Organic Frameworks with pcu Topology Based on Triangular Antiprism Node.

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|August 4, 2025
PubMed
Summary

Researchers developed a new fluorescent building block for creating advanced 3D covalent organic frameworks (3D COFs). These novel materials exhibit unique fluorescence and responsiveness to pressure, opening doors for new applications.

Keywords:
Conformation controlContinuous rotation electron diffractionCovalent organic frameworksPiezofluorochromismTriphenylamine

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Designing highly connected fluorescent polyhedral building blocks is crucial for advancing 3D covalent organic frameworks (3D COFs).
  • Synthetic and characterization challenges have limited the exploration of such building blocks.

Purpose of the Study:

  • To develop a novel hexatopic fluorescent building block with triangular antiprismatic geometry.
  • To synthesize and characterize new 3D COFs using this building block.
  • To investigate the photophysical properties and stimuli-responsive behavior of the resulting COFs.

Main Methods:

  • Steric-hindrance-directed conformational control and incorporation of triphenylamine units for building block synthesis.
  • Imine condensation reactions with linear diamines to form 3D COFs.
  • Continuous rotation electron diffraction for structural determination of the COFs.
  • Solid-state fluorescence and piezofluorochromism measurements.

Main Results:

  • A hexatopic fluorescent building block with triangular antiprismatic geometry was successfully synthesized.
  • Two crystalline 3D COFs with 6-fold interpenetrated pcu topology were obtained.
  • Both COFs displayed yellow-green solid-state fluorescence.
  • High-contrast piezofluorochromism was observed under hydrostatic pressure.

Conclusions:

  • This study introduces a new class of fluorescent polyhedral nodes for expanding the structural diversity of fluorescent 3D COFs.
  • The synthesized 3D COFs demonstrate potential as stimuli-responsive materials.
  • The findings pave the way for developing advanced functional materials with tunable optical properties.