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Viologen-Based Rotaxanes from Dibenzo-30-crown-10.

Hanlie R Wessels1, Carla Slebodnick1, Harry W Gibson1

  • 1Department of Chemistry , Virginia Tech , Blacksburg , Virginia 24060 , United States.

Journal of the American Chemical Society
|May 19, 2018
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel [2]- and [3]-rotaxanes using dibenzo-30-crown-10 and viologens. These findings represent the first successful formation of rotaxanes from these specific molecular components.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Molecular Recognition

Background:

  • Dibenzo-30-crown-10 is a macrocycle known for its binding properties.
  • Viologens are electron-deficient organic compounds with potential applications in molecular devices.
  • The formation of mechanically interlocked molecules like rotaxanes relies on specific host-guest interactions.

Purpose of the Study:

  • To synthesize and characterize novel rotaxanes utilizing the dibenzo-30-crown-10/viologen binding motif.
  • To establish the feasibility of forming rotaxanes from dibenzo-30-crown-10 and viologens.
  • To investigate the solution-phase complexation behavior between these components.

Main Methods:

  • Organic synthesis of [2]-rotaxanes (compounds 4, 7, 12) and a [3]-rotaxane (compound 8).
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy (¹H and ¹³C) and High-Resolution Mass Spectrometry (HRMS).
  • X-ray crystallography to determine the solid-state structure of a representative [2]-rotaxane (compound 7).

Main Results:

  • Successful synthesis of three [2]-rotaxanes and one [3]-rotaxane incorporating the dibenzo-30-crown-10/viologen system.
  • Comprehensive spectroscopic and mass spectrometric data confirming the structures of the synthesized rotaxanes.
  • Obtained X-ray crystal structure providing detailed molecular insights into the [2]-rotaxane architecture.
  • Demonstrated evidence of dibenzo-30-crown-10 forming pseudorotaxane complexes with viologens in solution.

Conclusions:

  • Dibenzo-30-crown-10 and viologens can effectively form mechanically interlocked molecules, specifically rotaxanes.
  • This study presents the first reported synthesis of rotaxanes using this particular macrocycle-guest combination.
  • The results confirm the formation of solution-phase pseudorotaxane complexes, validating the binding interaction between dibenzo-30-crown-10 and viologens.