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Capsule-bowl conversion triggered by a guest reaction.

Shitao Wang1, Tomohisa Sawada1, Makoto Fujita1

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. mfujita@appchem.t.u-tokyo.ac.jp.

Chemical Communications (Cambridge, England)
|October 7, 2016
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Summary

A novel M20L8 coordination capsule was created, demonstrating broad guest encapsulation capabilities due to its flexible structure. This dynamic capsule uniquely transforms into a bowl shape when encapsulating large guests or undergoing guest reactions.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Coordination capsules are supramolecular structures formed by metal ions and organic ligands.
  • These structures have shown potential in various applications, including host-guest chemistry and catalysis.
  • Understanding the dynamic behavior and structural transformations of coordination capsules is crucial for designing advanced functional materials.

Purpose of the Study:

  • To synthesize and characterize a new M20L8 coordination capsule.
  • To investigate the guest encapsulation properties and scope of the synthesized capsule.
  • To explore the dynamic structural transformations of the capsule upon guest encapsulation or reaction.

Main Methods:

  • Synthesis of the M20L8 coordination capsule using specific metal salts and organic linkers.
  • Characterization of the capsule using techniques such as X-ray diffraction, NMR spectroscopy, and mass spectrometry.
  • Guest encapsulation studies involving various guest molecules of different sizes and properties.
  • In situ monitoring of structural changes using spectroscopic methods.

Main Results:

  • Successful synthesis of a novel M20L8 coordination capsule with a well-defined structure.
  • Demonstration of the capsule's broad scope for encapsulating a wide range of guests, attributed to its structural flexibility.
  • Observation of a unique capsule-to-bowl structural conversion triggered by the encapsulation of large guests or by guest reactions within the capsule.
  • The dynamic nature of the capsule allows for reversible structural changes.

Conclusions:

  • The newly synthesized M20L8 coordination capsule exhibits significant potential for host-guest chemistry due to its structural flexibility and dynamic properties.
  • The observed capsule-bowl conversion represents a unique responsive behavior, expanding the functional possibilities of coordination capsules.
  • This study provides insights into the design of dynamic supramolecular systems with tunable properties for advanced applications.