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Can multivalency be expressed kinetically? The answer is yes.

Jovica D Badjić1, Stuart J Cantrill, J Fraser Stoddart

  • 1California NanoSystems Institute and Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095-1569, USA.

Journal of the American Chemical Society
|February 26, 2004
PubMed
Summary
This summary is machine-generated.

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Researchers explored the self-assembly of complex molecular machines. They discovered a slow conversion from a kinetically controlled complex to a thermodynamically controlled superbundle, questioning natural multivalency processes.

Area of Science:

  • Supramolecular Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Multivalency is a key concept in designing complex molecular architectures.
  • Artificial molecular machines require precise control over self-assembly processes.

Purpose of the Study:

  • To investigate the strict self-assembly of a triply threaded two-component superbundle.
  • To understand the kinetic and thermodynamic control in complex molecular assembly.

Main Methods:

  • Synthesis of a tritopic receptor with fused benzo[24]crown-8 macrorings on a triphenylene core.
  • Synthesis of a trifurcated trication with bipyridinium units linked to a central benzenoid core.
  • Monitoring self-assembly via NMR spectroscopy at low temperatures.

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Main Results:

  • Rapid formation of a doubly threaded two-component complex observed.
  • Extremely slow conversion (one week at 253 K) to a triply threaded superbundle (thermodynamically controlled product).
  • Demonstration of a kinetically controlled intermediate in supramolecular assembly.

Conclusions:

  • Complex molecular machines can exhibit slow equilibration between kinetic and thermodynamic products.
  • Raises questions about the role of kinetic control in natural multivalency processes.
  • Suggests potential biological implications of transient kinetic states in molecular recognition.