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H-Bonded Duplexes based on a Phenylacetylene Backbone.

Jonathan A Swain1, Giulia Iadevaia1, Christopher A Hunter1

  • 1Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , United Kingdom.

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Phenylacetylene oligomers with phenol and phosphine oxide groups form stable duplexes. These synthetic molecules show promise for creating artificial information systems similar to nucleic acids.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Development of synthetic information molecules is crucial for advanced applications.
  • Phenylacetylene backbones offer a versatile platform for constructing complex molecular architectures.
  • Hydrogen bonding is a key interaction in biological systems, inspiring synthetic mimics.

Purpose of the Study:

  • To synthesize and characterize phenylacetylene oligomers with specific recognition sites.
  • To investigate the formation and stability of multiply H-bonded duplexes in solution.
  • To explore the potential of these systems as synthetic information carriers.

Main Methods:

  • Sonogashira coupling for oligomer synthesis.
  • Reverse-phase preparative high-pressure liquid chromatography for purification.
  • 31P Nuclear Magnetic Resonance (NMR) denaturation experiments to study duplex stability.

Main Results:

  • Successfully synthesized phenylacetylene oligomers with phenol and phosphine oxide recognition units.
  • Demonstrated the formation of stable, multiply H-bonded duplexes between complementary oligomers.
  • Quantified association constants, showing significant cooperative effects with increasing duplex length.

Conclusions:

  • Phenylacetylene oligomers effectively form stable, extended duplexes through cooperative intermolecular hydrogen bonding.
  • The synthesized supramolecular architecture shows potential for developing synthetic information molecules.
  • This work advances the design of artificial systems mimicking nucleic acid functions.