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Observing Transient Breathing States of MIL-53 Homologues Using In Situ Single Crystal 3D Electron Diffraction.

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Small (Weinheim an Der Bergstrasse, Germany)
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Flexible metal-organic frameworks (MOFs) like MIL-53 exhibit unique breathing behaviors. In situ electron diffraction revealed continuous structural transitions under vacuum, unlike stepwise breathing at ambient pressure.

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) are known for their porosity and flexibility.
  • The MIL-53 series is a classic example of flexible MOFs exhibiting 'breathing' behavior.
  • Desolvated MIL-53 materials transition between open and closed phases with temperature changes.

Purpose of the Study:

  • To characterize the structural transitions of MIL-53(Cr) and MIL-53(Ga) during breathing.
  • To investigate the continuous breathing mechanism under vacuum using in situ electron diffraction.
  • To understand particle-to-particle structural heterogeneity in flexible MOFs.

Main Methods:

  • In situ single crystal 3D electron diffraction was employed.
  • Sample conditions were varied within the electron diffractometer to induce breathing.
  • Crystal structures of hydrated, anhydrous, closed, and open pore phases were analyzed.

Main Results:

  • Nine intermediate phases of MIL-53 breathing were identified under vacuum.
  • Continuous structural transitions were observed under vacuum, contrasting with stepwise breathing at ambient pressure.
  • Insights into metal-dependent adsorption phenomena and particle heterogeneity were gained.

Conclusions:

  • In situ 3D electron diffraction reveals continuous breathing in MIL-53 under vacuum.
  • This technique uncovers structural heterogeneity missed by conventional methods.
  • The findings advance the understanding of flexible porous materials and their adsorption properties.