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Quantifying the Effect of Guest Binding on Host Environment.

Hugh P Ryan1, Zachary S Fishman2, Jacob T Pawlik2

  • 1Cambridge University Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

Journal of the American Chemical Society
|August 29, 2023
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Summary
This summary is machine-generated.

Host-guest complex interactions are quantified using microwave microfluidics and PCA. Guest solubility impacts ion pairing and hydration, crucial for designing advanced host-guest systems.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • The environment of host-guest complexes, including solvent and counterions, dictates solubility and reactivity.
  • These intermolecular interactions are vital for host-guest system applications in catalysis and separations.
  • Standard analytical techniques struggle to detect these complex environmental interactions.

Purpose of the Study:

  • To quantify the hydration and ion pairing of a specific iron(II) coordination cage (FeII4L4) with diverse guest molecules.
  • To determine how guest molecule properties influence the host's ion pairing and hydration dynamics.
  • To establish a foundation for next-generation design criteria in host-guest chemistry.

Main Methods:

  • Utilized microwave microfluidic measurements to probe the host-guest system.
  • Applied principal component analysis (PCA) to analyze the collected data.
  • Correlated measured circuit parameters with guest molecule properties like solubility and dipole moment.

Main Results:

  • Guest molecules were observed to displace bound counterions from the coordination cage upon introduction.
  • Guest molecule water solubility emerged as the dominant factor influencing solvent and ion-pairing dynamics.
  • PCA revealed that guest properties explained over 90% of the variance in circuit parameters.
  • Cage-counterion pairing followed a single, one-step reaction model, independent of guest type.
  • Ion-pairing association constants decreased with increasing guest water solubility.

Conclusions:

  • Developed a quantitative method to assess hydration and ion-pairing in host-guest complexes.
  • Demonstrated the significant impact of guest physicochemical properties, particularly solubility, on the complex's environment.
  • Provided critical data for refining the design principles of host-guest systems for targeted applications.