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Molecules with shape memory based on restricted rotation.

D S Choi1, Y S Chong, D Whitehead

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.

Organic Letters
|November 9, 2001
PubMed
Summary
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Diimide and octaimide molecules exhibit two stable conformations due to restricted rotation. Heating in specific solvents allows predictable control over these folded and unfolded structures, which are then locked in upon cooling.

Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Restricted rotation around single bonds can lead to distinct molecular conformations.
  • Solvent polarity influences molecular structure and dynamics.
  • Understanding conformational preferences is key in molecular design.

Purpose of the Study:

  • To investigate the conformational behavior of diimide and octaimide molecules.
  • To explore the role of solvent polarity in controlling molecular conformations.
  • To establish methods for locking specific rotamer ratios.

Main Methods:

  • Synthesis of diimide (1) and octaimide (2) compounds.
  • Variable temperature NMR spectroscopy to study conformational dynamics.

Related Experiment Videos

  • Solvent screening using varying polarity (Reichardt's parameter, E(T30)).

    • Main Results:

    • Both diimide 1 and octaimide 2 exist in two stable conformations: 'folded' and 'unfolded'.
    • Heating in solvents of specific polarity (E(T30)) predictably alters the ratio of folded to unfolded rotamers.
    • Upon cooling, the conformational ratios achieved at elevated temperatures are preserved due to reestablished restricted rotation.

    Conclusions:

    • Conformational control of diimides and octaimides is achievable through solvent-mediated thermal processing.
    • The study demonstrates a method for 'locking in' desired conformational ratios.
    • This work provides insights into the relationship between solvent properties and molecular conformational dynamics.