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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
12:33

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Published on: February 4, 2013

To fold or to assemble?

Wei Wang1, Lin-Song Li, Greg Helms

  • 1Department of Chemistry and Center for Materials Research, Washington State University, Pullman, Washington 99164, USA.

Journal of the American Chemical Society
|January 30, 2003
PubMed
Summary
This summary is machine-generated.

Researchers developed new foldable oligomers that self-assemble into nanostructures. Folding occurs at low concentrations, followed by self-assembly at higher concentrations, driven by pi-pi interactions.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Oligomers with alternating rigid and flexible regions are of interest for self-assembly.
  • Understanding the driving forces and concentration dependence of folding and self-assembly is crucial.

Purpose of the Study:

  • To introduce a new class of foldable oligomers.
  • To investigate the molecular mechanisms of folding and self-assembly.
  • To determine the concentration-dependent behavior of these processes.

Main Methods:

  • Synthesis of alternating rigid-flexible oligomers.
  • Spectroscopic analysis including absorption, fluorescence, and Nuclear Magnetic Resonance (NMR).
  • Concentration-dependent studies to monitor folding and self-assembly dynamics.

Main Results:

  • Foldable oligomers form pi-stacked folded conformers driven by pi-pi molecular orbital overlaps.
  • Folding is the dominant process at low concentrations (< 1 mM).
  • Self-assembly into larger nanostructures occurs at higher concentrations (1-100 mM) and follows folding.

Conclusions:

  • A new class of foldable oligomers has been successfully synthesized and characterized.
  • The study elucidates the sequential nature of folding and self-assembly in these oligomers.
  • Pi-pi interactions are key drivers for both molecular folding and supramolecular organization.