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Modulating Guest Uptake in Core-Shell MOFs with Visible Light.

Dragos Mutruc1, Alexis Goulet-Hanssens1, Sam Fairman2

  • 1Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor Strasse 2, 12489, Berlin, Germany.

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PubMed
Summary
This summary is machine-generated.

Researchers developed a smart metal-organic framework (MOF) with a light-responsive shell. This "gate" controls molecule entry and exit using visible light, enabling efficient guest uptake and storage.

Keywords:
azobenzeneguest uptake/releasemetal-organic frameworksphotochromismvisible light

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable porosity for gas storage and separation.
  • Developing stimuli-responsive MOFs is crucial for advanced material applications.
  • Photoisomerization of azobenzene moieties provides a mechanism for light-induced structural changes.

Purpose of the Study:

  • To create a core-shell MOF with a light-responsive outer shell for controlled guest molecule diffusion.
  • To utilize the photoisomerization of azobenzene linkers for light-gating applications.
  • To achieve efficient and reversible control over molecular uptake and release in MOFs.

Main Methods:

  • Solvothermal synthesis of a UiO-68 type MOF core.
  • Solvent-assisted linker exchange to introduce azobenzene moieties into the shell.
  • Characterization of MOF structure and photoresponsive properties using spectroscopy and microscopy.
  • Investigation of guest molecule diffusion kinetics under visible light irradiation.

Main Results:

  • Successfully synthesized core-shell UiO-68 MOF single crystals with a photoresponsive shell.
  • Demonstrated efficient and reversible E/Z photoisomerization of azobenzene linkers upon visible light exposure.
  • Showcased light-controlled modulation of molecular uptake and release through the MOF shell.
  • Established the shell as a kinetic barrier, acting as a light-controlled gate for guest molecules.

Conclusions:

  • The developed core-shell MOF functions as a "smart" material with a light-gated shell.
  • This system offers a novel approach for controlled cargo delivery and storage applications.
  • The photoisomerization of azobenzene moieties provides an efficient mechanism for external control over MOF permeability.