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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Controlling the Host-Guest Interaction Mode through a Redox Stimulus.

György Szalóki1, Vincent Croué1, Vincent Carré2

  • 1Université d'Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045, Angers Cedex, France.

Angewandte Chemie (International Ed. in English)
|October 31, 2017
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Summary
This summary is machine-generated.

This study demonstrates a platinum-based metallacage that can bind and release guests. Oxidation controls this host-guest process, showcasing redox-switchable molecular recognition.

Keywords:
cage compoundshost-guest systemsself-assemblysupramolecular chemistrytetrathiafulvalene

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Host-guest systems are crucial for molecular recognition and encapsulation.
  • Controlling binding and release mechanisms is key for developing responsive materials.
  • Redox-active ligands offer tunable electronic properties for dynamic systems.

Purpose of the Study:

  • To design and characterize a redox-active metallacage for controlled host-guest interactions.
  • To investigate the mechanism of guest binding and release triggered by redox stimuli.
  • To demonstrate the potential of metallacages in switchable molecular recognition.

Main Methods:

  • Synthesis of a neutral, robust Pt-based metallacage featuring extended-tetrathiafulvalene (exTTF) ligands.
  • Host-guest complexation studies with a planar polyaromatic guest (coronene).
  • Electrochemical and chemical oxidation experiments to induce guest expulsion.
  • Characterization using 1H NMR spectroscopy, ESI-FTICR, and spectroelectrochemistry.
  • Theoretical calculations using density functional theory (DFT).

Main Results:

  • The neutral metallacage successfully binds coronene.
  • Oxidation of the host-guest complex leads to reversible guest expulsion.
  • The expulsion is attributed to altered host-guest interactions and counteranion influence.
  • Experimental and theoretical data confirm the reversible redox-controlled process.

Conclusions:

  • A Pt-based redox-active metallacage enables switchable host-guest complexation.
  • The binding/releasing process is effectively controlled by the redox state of the cage.
  • This work highlights the role of counteranions in redox-mediated guest exchange within metallacages.