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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Organic Chemistry

Background:

  • Oligomers with complementary recognition units offer potential for encoding and expressing chemical information, analogous to nucleic acids.
  • The study focuses on m-phenylene ethynylene polymers functionalized with hydrogen-bond donor (D) and acceptor (A) side chains.

Purpose of the Study:

  • Investigate the supramolecular assembly properties of these functionalized polymers in solution.
  • Evaluate the potential for sequence-selective assembly and the development of programmable synthetic polymers.

Main Methods:

  • One-pot synthesis of m-phenylene ethynylene polymers with varying sequences (ADnA, DAnD, n=1-5) using bifunctional monomers and monofunctional chain stoppers.
  • Separation of oligomers via chromatography.
  • Characterization of self-association and folding using Nuclear Magnetic Resonance (NMR) and fluorescence spectroscopy.
  • Quantification of duplex stability through DMSO denaturation experiments.

Main Results:

  • All synthesized oligomers exhibit self-association via intermolecular hydrogen bonding.
  • While shorter sequences (3-mers) do not fold, longer sequences show intramolecular hydrogen bonding.
  • Sequence-complementary oligomers form stable 1:1 duplexes.
  • Duplex stability increases significantly with the number of base-pairing interactions, with association constants ranging from 10^3 M^-1 to 10^5 M^-1.

Conclusions:

  • Intramolecular folding competes with duplex formation, impacting the fidelity of sequence-selective assembly.
  • The study presents a practical strategy for assessing the suitability of these oligomers for creating programmable synthetic polymers.
  • Hydrogen-bonding interactions are key to the controlled assembly of these functionalized polymers.