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Selective Co-Encapsulation Inside an M6 L4 Cage.

Stefan H A M Leenders1, René Becker1, Tatu Kumpulainen1

  • 1Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 15, 2016
PubMed
Summary

Selective co-encapsulation of metal complexes and aromatic guests within M6L4 metallocages is achieved only when both are present. This ternary complex formation depends on component interactions and can be controlled by charge-transfer effects.

Keywords:
charge-transfer complexesco-encapsulationhost-guest systemssupramolecular chemistryternary structures

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Molecular encapsulation is crucial for stabilizing guests, facilitating reactions, and enabling energy transfer.
  • Understanding encapsulation events is key to developing functional molecular encapsulation systems.

Purpose of the Study:

  • To demonstrate selective co-encapsulation of metal complexes and aromatic compounds within a metallocage.
  • To investigate the factors influencing ternary complex formation and stability.

Main Methods:

  • Utilizing self-assembled M6L4 metallocages for guest encapsulation.
  • Employing UV/Vis spectrophotometry to observe charge-transfer bands and analyze energy shifts.
  • Investigating selective exchange of components within the metallocage.

Main Results:

  • Ir and Rh-Cp-type metal complexes are co-encapsulated with aromatic compounds, but not individually.
  • Selective co-encapsulation forms ternary complexes, with efficiency dependent on component interactions.
  • Charge-transfer interactions influence co-encapsulation, evidenced by UV/Vis spectra and shifts in energy bands correlated with oxidation potential.

Conclusions:

  • M6L4 metallocages enable selective co-encapsulation of metal complexes and aromatic guests.
  • Ternary complex formation is governed by size effects and charge-transfer interactions.
  • Controlled energy differences can potentially modulate binding and reactivity within confined spaces.