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Mechanical bonds and topological effects in radical dimer stabilization.

Marco Frasconi1, Takashi Kikuchi, Dennis Cao

  • 1Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

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Topology significantly influences the redox properties and stability of tetrathiafulvalene (TTF) radical dimers in mechanically interlocked molecules. This study reveals how structural arrangement, not just bonding, dictates dimer formation and behavior.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Electrochemistry

Background:

  • Mechanical bonding stabilizes tetrathiafulvalene (TTF) radical dimers.
  • The role of topology in catenanes containing TTF units remains underexplored.

Purpose of the Study:

  • To investigate how topology, alongside mechanical bonding, controls TTF radical dimer formation in isomeric catenanes.
  • To compare the redox properties and dimer stability across topologically distinct TTF-containing catenanes.

Main Methods:

  • Synthesis and characterization of isomeric [3]- and doubly interlocked [2]catenanes containing TTF units.
  • Electrochemical analysis to study redox properties and radical dimer formation.
  • Comparison of TTF dimer stability in different topological frameworks.

Main Results:

  • Topological isomers exhibit substantially different redox behavior.
  • The stability of mixed-valence (TTF2)(•+) dimers is similar in the two catenanes.
  • Radical cationic (TTF(•+))2 dimers are fleeting in the [2]catenane and absent in the ring-in-ring complex, but prominent in the [3]catenane.

Conclusions:

  • A fundamental relationship exists between topology and redox properties in TTF-containing catenanes.
  • Mechanical bonding and topology synergistically control the formation and stability of TTF radical dimers.