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Noncovalent Assembly of [2]Rotaxane Architectures.

Christopher A Hunter1, Caroline M R Low2, Martin J Packer1

  • 1Centre for Chemical Biology Krebs Institute for Biomolecular Science Department of Chemistry University of Sheffield Sheffield S3 7HF (UK) Fax: (+44) 114-273-8673.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary

Researchers assembled a [2]rotaxane using reversible zinc-pyridine coordination and hydrogen bonding. The dynamic equilibrium of a stable porphyrin dimer was key to constructing this molecular machine.

Keywords:
hydrogen bondsnoncovalent interactionsporphyrinoidsrotaxanessupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Self-assembly is a powerful strategy for creating complex molecular architectures.
  • Coordination bonds and hydrogen bonds are fundamental non-covalent interactions used in supramolecular chemistry.
  • Rotaxanes are mechanically interlocked molecules with potential applications in nanotechnology.

Purpose of the Study:

  • To construct a [2]rotaxane using a combination of reversible coordination and hydrogen-bonding interactions.
  • To leverage the cooperative effects in macrocyclization for enhanced stability.
  • To exploit the dynamic equilibrium of a porphyrin dimer for rotaxane formation.

Main Methods:

  • Utilizing zinc-pyridine coordination for reversible assembly.
  • Employing hydrogen-bonding interactions to drive macrocyclization.
  • Designing a porphyrin dimer that exists in dynamic equilibrium with its monomer.

Main Results:

  • Successful assembly of a [2]rotaxane from three components.
  • Demonstration of cooperative effects leading to a stable macrocyclic component.
  • Exploitation of the kinetic lability of zinc-porphyrin interactions for rotaxane construction.

Conclusions:

  • Reversible coordination and hydrogen bonding are effective strategies for building complex supramolecular structures like rotaxanes.
  • The dynamic equilibrium of molecular components can be strategically utilized in self-assembly processes.
  • This work provides a new method for constructing mechanically interlocked molecules with potential for advanced applications.