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Coulombic-enhanced hetero radical pairing interactions.

Xujun Zheng1,2, Yang Zhang1, Ning Cao1

  • 1Department of Chemistry, Zhejiang University, 310027, Hangzhou, China.

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Summary

This study reveals novel hetero radical-pairing interactions between different charged radicals, driven by Coulombic attraction. These interactions enable advanced host-guest recognition and reversible switching in molecular machines.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Spin-spin interactions in identical aromatic radicals are well-established for supramolecular recognition.
  • Previous studies focused on homoradical interactions, limiting the scope of radical-based molecular assembly.

Purpose of the Study:

  • To investigate and report on spin-pairing interactions between two different π-electron radicals.
  • To explore the role of Coulombic attraction in facilitating these hetero radical-pairing interactions.
  • To demonstrate the application of these interactions in host-guest recognition and molecular switching.

Main Methods:

  • Utilizing a bipyridinium radical cation (BPY+•) and a naphthalene-1,8:4,5-bis(dicarboximide) radical anion (NDI−•).
  • Investigating the electronic and structural properties of the interacting radical pair.
  • Employing spectroscopic and electrochemical techniques to confirm radical pairing and Coulombic enhancement.

Main Results:

  • Successfully demonstrated spin-pairing interactions between distinct BPY+• and NDI−• radicals.
  • Attributed the occurrence of these hetero radical-pairing interactions to enhanced Coulombic attraction.
  • Showcased the utility of these interactions in driving host-guest complexation.
  • Demonstrated reversible switching of a bistable [2]rotaxane using Coulombic-enhanced hetero radical pairing.

Conclusions:

  • Hetero radical-pairing interactions between oppositely charged radicals are feasible and driven by Coulombic forces.
  • This novel interaction mechanism provides a new avenue for designing sophisticated supramolecular systems.
  • Coulombic-enhanced hetero radical pairing offers a powerful tool for molecular recognition and the development of responsive molecular machines.