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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with tunable structures.
  • Understanding the structural dynamics of 2D COFs is crucial for designing functional materials.
  • Previous studies often lack detailed structural information on COFs during dynamic processes.

Purpose of the Study:

  • To elucidate the detailed crystal structures of a 2D COF and its derivatives.
  • To investigate the structural evolution of the 2D COF during chemical reactions and solvent exchange.
  • To provide insights into the relationship between molecular conformation and framework ordering.

Main Methods:

  • Single-crystal X-ray diffraction (SCXRD) was employed to determine 9 crystal structures.
  • High-resolution SCXRD data (up to 0.85 Å) allowed detailed analysis of structural parameters.
  • In situ or ex situ analyses captured dynamic states during solvent exchange/loss and chemical derivatization.

Main Results:

  • Detailed structural parameters including stacking mode, interlayer distance, pore aperture, and molecular incline angle were determined for the parent COF, 5 derivatives, and 3 dynamic states.
  • The study observed stepwise conformational transformations of molecular building blocks driving structural evolution.
  • Despite significant structural changes, the long-range ordering of the 2D COF was preserved.

Conclusions:

  • The study provides unprecedented structural insights into the dynamic behavior of 2D COFs.
  • Understanding structure evolution is key to controlling COF properties for applications.
  • Preservation of long-range order during transformation highlights the robustness of the COF framework.