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Electron-Triggered Metamorphism in Palladium-Driven Self-Assembled Architectures.

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Viologen-based radicals self-assemble into macrocycles and coordination polymers using a metal-induced strategy. Their redox state reversibly changes the assembly size, demonstrating tunable supramolecular structures.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Viologen-based compounds are redox-active molecules with applications in molecular electronics and sensing.
  • Self-assembly is a powerful strategy for constructing complex supramolecular architectures.
  • Controlling the size and properties of self-assembled structures is crucial for their functional applications.

Purpose of the Study:

  • To develop a metal-induced self-assembly strategy for viologen-based radicals.
  • To investigate the formation of discrete macrocycles and coordination polymers.
  • To explore the effect of redox state changes on the self-assembled structures.

Main Methods:

  • Self-assembly of a viologen-based ditopic ligand with palladium(II) complexes.
  • Utilizing metal ions (Pd) to direct the formation of 2:2 (M:L) macrocycles and coordination polymers.
  • Modulating the redox state of viologen units to induce structural changes.

Main Results:

  • Formation of discrete box-shaped 2:2 (M:L) macrocycles and coordination polymers in solution.
  • Reversible "inflation/deflation" of macrocyclic assemblies upon changing viologen redox state.
  • Dissociation of coordination polymers triggered by viologen-centered electron transfer.

Conclusions:

  • Metal-induced self-assembly provides a versatile route to viologen-based supramolecular structures.
  • The redox state of viologen units offers a mechanism for dynamic control over assembly size and properties.
  • These findings open avenues for designing responsive materials based on viologen-metal coordination.