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Supramolecular daisy chains.

S J Cantrill1, G J Youn, J F Stoddart

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, 90095, USA.

The Journal of Organic Chemistry
|October 13, 2001
PubMed
Summary
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Researchers synthesized daisy chain monomers based on [24]- and [25]crown-8 macrocycles. The [24]crown-8 monomers predominantly form dimeric superstructures in multiple phases, while [25]crown-8 monomers exhibit limited oligomerization due to weaker interactions.

Area of Science:

  • Supramolecular Chemistry
  • Macrocyclic Chemistry
  • Organic Synthesis

Background:

  • Self-complementary daisy chain monomers are novel supramolecular building blocks.
  • Crown ethers and ammonium ions are key components in host-guest chemistry.
  • Understanding aggregation behavior is crucial for designing complex molecular architectures.

Purpose of the Study:

  • To synthesize and characterize two series of self-complementary daisy chain monomers based on [24]- and [25]crown-8 macrocycles.
  • To investigate the aggregation behavior and superstructure formation in different phases (solid, gas, solution).
  • To elucidate the influence of macrocycle size and substituent variations on supramolecular assembly.

Main Methods:

  • Synthesis of novel daisy chain monomers with secondary ammonium ion-containing arms.

Related Experiment Videos

  • X-ray crystallography for solid-state structure determination.
  • Mass spectrometry for gas-phase analysis.
  • NMR spectroscopy (including deuterated and fluorinated analogues) for solution-phase behavior.
  • Variable concentration, temperature, and solvent polarity studies.

    • Main Results:

    • The [24]crown-8-based monomer forms stable dimeric superstructures in solid and gas phases, and predominantly in solution under normal conditions.
    • Solution-phase aggregation of [24]crown-8 monomers is disrupted by low concentration, high temperature, or highly polar solvents.
    • [24]crown-8 monomers can form complex stereoisomeric superstructures.
    • The [25]crown-8-based monomers exhibit weaker host-guest interactions, leading to limited oligomerization (dimeric and trimeric structures only).
    • [25]crown-8 monomers exclusively form achiral superstructures.

    Conclusions:

    • Macrocycle size significantly impacts the aggregation behavior and stability of daisy chain monomer superstructures.
    • The [24]crown-8 system offers robust dimeric assembly, albeit with potential for stereoisomerism.
    • The [25]crown-8 system demonstrates controlled, limited oligomerization, suitable for specific supramolecular designs.
    • These findings provide insights into the rational design of self-assembling supramolecular systems based on crown ether-ammonium ion interactions.