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Researchers developed stereochemical strategies to control heterochiral helix coupling, enabling the evolution of nanofibers into complex superstructures. This method allows dynamic control over biostructure evolution, unlike static homochiral systems.

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Area of Science:

  • Supramolecular Chemistry
  • Chiral Materials Science
  • Biostructure Evolution

Background:

  • Precise matching of chiral structures is crucial for directing biostructure evolution.
  • Current methods for creating stereoselective pairs rely on static self-assembly.
  • Dynamically controlling helix coupling for structure evolution remains a significant challenge due to complex chirality transfer.

Purpose of the Study:

  • To introduce stereochemical strategies for controlling heterochiral helix coupling (P and M helices).
  • To enable the evolution of primary nanofibers into advanced superstructures.
  • To investigate mechanisms of chirality transfer in racemic and meso-systems.

Main Methods:

  • Employing stereochemical strategies: homochirality to racemization or mesomerization.
  • Utilizing in situ generated heterochiral P-M helix coupling via spatially matched hydrogen bonds.
  • Analyzing chirality transfer mechanisms, including bifurcated transfer in racemic systems facilitated by CH···π interactions.

Main Results:

  • Homochiral systems remained as nanofibers without evolution for over a year.
  • Racemization and mesomerization strategies triggered evolution to superstructures within 7 hours and 12 months, respectively.
  • Racemic systems exhibited a rare bifurcated chirality transfer mechanism, unlike unidirectional transfer in meso-systems.

Conclusions:

  • Stereochemical control over heterochiral helix coupling is a viable strategy for directing biostructure evolution.
  • The developed strategies enable dynamic control over the formation of complex helical superstructures.
  • Understanding chirality transfer mechanisms is key to designing advanced self-assembling chiral materials.