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An Expandable Hydrogen-Bonded Organic Framework Characterized by Three-Dimensional Electron Diffraction.

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|June 30, 2020
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Summary
This summary is machine-generated.

A novel hydrogen-bonded organic framework (HOF) expands upon activation due to flexible molecule conformational changes. This dynamic porous material exhibits negative thermal expansion, offering new possibilities in materials science.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Hydrogen-bonded organic frameworks (HOFs) are crystalline materials with tunable porosity.
  • Activation processes, such as solvent removal, can induce structural changes in HOFs.
  • Understanding these transformations is crucial for designing functional porous materials.

Purpose of the Study:

  • To investigate the structural transformation of a 2-D HOF upon solvent removal.
  • To elucidate the role of molecular conformation in framework expansion.
  • To characterize the porosity and thermal expansion properties of the activated HOF.

Main Methods:

  • Solvent removal and activation of the HOF crystal.
  • Three-dimensional electron diffraction (3D ED) for structural analysis.
  • Brunauer-Emmett-Teller (BET) surface area analysis.
  • Crystal structure prediction (CSP) for energetic evaluation.

Main Results:

  • The HOF, ABTPA-2, undergoes framework expansion upon activation.
  • Flexible ABTPA molecules adapt conformation, using anthracene units as anchors.
  • The activated phase exhibits high surface area (1183 m^2 g^-1) and negative area thermal expansion.
  • CSP provided insights into the energetics driving the transformation.

Conclusions:

  • Molecular conformational flexibility is key to the observed framework expansion in this HOF.
  • The activated ABTPA-2 material demonstrates dynamic porosity and unusual negative thermal expansion.
  • Challenges and potential of CSP for flexible systems were highlighted.