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Light-triggered crystallization of a molecular host-guest complex.

Guido H Clever1, Shohei Tashiro, Mitsuhiko Shionoya

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Researchers demonstrate light-induced release of molecules from metal-organic cages. This reversible process controls molecular machines by switching azobenzene guests using light, preventing waste and enabling new material formation.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Controlling structural changes in supramolecular assemblies is crucial for developing molecular machines.
  • Azobenzene's reversible photoisomerization offers a waste-free method for external input using light.

Purpose of the Study:

  • To demonstrate the light-triggered expulsion of a specific azobenzene guest from a metal-organic cage.
  • To investigate the reversibility of this light-driven encapsulation and release process.
  • To explore the impact of cage solubility on the process.

Main Methods:

  • Utilizing a self-assembled metal-organic cage composed of pyridyl ligands and Pd(II) ions.
  • Employing cis-4,4'-azobenzene bis-sulfonate as a light-switchable guest.
  • Comparing a highly soluble, PEGylated cage derivative with less soluble, unsubstituted cages.
  • Conducting X-ray structure analysis to confirm molecular interactions.

Main Results:

  • Photoisomerization of the cis-azobenzene guest to the trans-isomer triggered its expulsion from the host-guest complex.
  • A highly soluble cage derivative showed full reversibility of the light-driven encapsulation/release process.
  • Less soluble cages crystallized upon guest photoisomerization, with guests binding externally to Pd(II) centers.

Conclusions:

  • The study successfully demonstrates light-controlled guest release from metal-organic cages via azobenzene photoisomerization.
  • Solubility plays a critical role in the reversibility and outcome of the light-driven process.
  • This work advances the development of light-responsive molecular machines and stimuli-responsive materials.