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Capsule-Capsule Conversion by Guest Encapsulation.

Shitao Wang1, Tomohisa Sawada1, Kazuaki Ohara2

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.

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Summary
This summary is machine-generated.

Large guest molecules trigger a transformation in palladium-based supramolecular capsules, expanding their internal volume. This structural change effectively isolates guests within the larger, dynamic host structure.

Keywords:
coordination chemistryhost-guest systemsmolecular capsulesself-assemblysupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Palladium(II) complexes with specific ligands can form well-defined supramolecular structures.
  • Trigonal bipyramidal and octahedral coordination geometries are achievable with these building blocks.
  • Large hydrophobic cavities within supramolecular cages are of interest for molecular encapsulation.

Purpose of the Study:

  • To investigate the guest-induced structural conversion of M18L6 and M24L8 supramolecular capsules.
  • To characterize the change in cavity volume upon guest encapsulation.
  • To assess the stability and isolation of guests within the dynamic capsule framework.

Main Methods:

  • Synthesis of M18L6 (trigonal bipyramidal) and M24L8 (octahedral) palladium-based supramolecular capsules.
  • Encapsulation of large aromatic guests.
  • Structural characterization using techniques like NMR spectroscopy and X-ray crystallography (implied).
  • Analysis of guest extractability and host dynamics.

Main Results:

  • Guest-induced conversion of the M18L6 trigonal bipyramid to the M24L8 octahedron was observed.
  • The M24L8 octahedron exhibits a cavity volume approximately three times larger than the M18L6 capsule.
  • Encapsulated guests are difficult to extract, indicating effective isolation from the external environment.
  • The host-guest system demonstrates dynamic properties while maintaining guest confinement.

Conclusions:

  • Supramolecular palladium cages can undergo significant structural transformations in response to guest molecules.
  • The M24L8 capsule offers a substantially larger void space compared to the M18L6 capsule.
  • These dynamic yet confining supramolecular structures show potential for selective guest sequestration and stabilization.