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Single-Crystal Dynamic Covalent Organic Frameworks for Adaptive Guest Alignments.

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Dynamic 3D covalent organic frameworks (COFs) exhibit adaptive guest inclusion through molecular motion. This study reveals atomic-level dynamics and specific pathways enabling framework flexibility for molecular sponges.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Dynamic 3D covalent organic frameworks (COFs) show structural changes with guest molecules.
  • The precise mechanisms of COF flexibility and guest adaptation are not fully understood.

Purpose of the Study:

  • To provide atomic-level insights into the dynamics of COF-300 during guest inclusion.
  • To elucidate the conformational mobility and host-guest adaptivity in dynamic COFs.

Main Methods:

  • Single-crystal growth of COF-300 using a diffusion gradient transimination protocol.
  • High-resolution X-ray diffraction for structural analysis.
  • Quantitative energy analysis of structural transformations.

Main Results:

  • Observed rotational and translational dynamics of imine linkages and phenyl units in COF-300.
  • Identified switching torsion angles in terephthalaldehyde diimine motifs.
  • Uncovered metastable intermediate phases during structural evolution.
  • Demonstrated framework adaptation to diverse guest molecules with various alignments.

Conclusions:

  • Conformational mobility in COFs is driven by specific molecular dynamics, not arbitrary motions.
  • Dynamic COFs can be engineered as molecular sponges for studying liquid structures.
  • The observed pathways resemble protein folding, suggesting predictable dynamic behavior.