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Mirror image nanostructures.

Benjamin W Messmore1, Preeti A Sukerkar, Samuel I Stupp

  • 1Department of Chemistry, Department of Materials Science and Engineering, and Feinberg School of Medicine, Northwestern University, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|June 2, 2005
PubMed
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Chiral molecules self-assemble into distinct 28 nm helices, with R- and S-enantiomers forming mirror-image nanostructures. This assembly is driven by hydrogen-bonding and pi-pi stacking, not hierarchical structures.

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Chiral molecules self-assembly into complex structures, mimicking protein folding.
  • Hierarchical chiral structures are often difficult to interpret at the molecular level.
  • Applications exist in catalysis and nonlinear optics.

Purpose of the Study:

  • To investigate the self-assembly of chiral molecules into nanostructures.
  • To understand the relationship between molecular structure and supramolecular chirality.
  • To explore the influence of stereocenter separation on assembly behavior.

Main Methods:

  • Observation of chiral molecule self-assembly.
  • Characterization of resulting helical nanostructures.

Related Experiment Videos

  • Analysis of molecular components driving assembly.

    • Main Results:

    • Formation of well-defined helices with a 28 nm pitch.
    • R- and S-enantiomers produced mirror-image nanostructures.
    • Assembly was not hierarchical, potentially due to stereocenter separation.

    Conclusions:

    • Molecular chirality, influenced by a peripheral dimethyloctyl coil, dictates supramolecular helicity.
    • Strong hydrogen-bonding and pi-pi stacking are primary drivers of assembly.
    • Significant separation between the stereocenter and hydrogen-bonding segment prevents hierarchical structures.