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Cyclodextrin-templated porphyrin nanorings.

Pengpeng Liu1, Patrik Neuhaus, Dmitry V Kondratuk

  • 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford OX1 3TA (UK) http://hla.chem.ox.ac.uk/

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Summary

Flexible cyclodextrin scaffolds effectively direct the synthesis of macrocyclic porphyrin nanorings. Chirality transfer to these nanorings is confirmed, demonstrating a new pathway for creating larger macrocyclic structures.

Keywords:
cooperativitycyclodextrinsflexibilitypreorganizationtemplated synthesis

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Nanotechnology

Background:

  • Cyclodextrins are versatile scaffolds in supramolecular chemistry.
  • Template-directed synthesis is crucial for constructing complex macrocycles.
  • Previous rigid templates showed limitations in synthesizing specific macrocyclic architectures.

Purpose of the Study:

  • To synthesize novel six- and seven-legged templates using alpha- and beta-cyclodextrins.
  • To investigate the effectiveness of these flexible templates in directing porphyrin oligomer synthesis.
  • To explore the transfer of chirality from cyclodextrin templates to porphyrin nanorings.

Main Methods:

  • Functionalization of cyclodextrins with 4-pyridyl moieties.
  • Template-directed synthesis of macrocyclic porphyrin oligomers.
  • Characterization using Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) spectroscopy.

Main Results:

  • Successful synthesis of six- and seven-legged cyclodextrin-based templates.
  • Effective direction of macrocyclic porphyrin oligomer formation (six or seven units).
  • Demonstrated chirality transfer from templates to nanoring hosts.
  • High binding effective molarity for flexible alpha-cyclodextrin templates (74 M).

Conclusions:

  • Flexible cyclodextrin templates are highly effective for synthesizing porphyrin nanorings.
  • Chirality transfer from template to host is confirmed.
  • This approach enables the synthesis of larger macrocycles using templates with prime numbers of binding sites.