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Related Experiment Video

Updated: May 9, 2026

Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores
11:38

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Accurate method to quantify binding in supramolecular chemistry.

Kristjan Haav1, Sandip A Kadam, Lauri Toom

  • 1Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia.

The Journal of Organic Chemistry
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

A new method accurately measures host-guest binding affinities by comparing differences in binding strength. This approach enhances precision by canceling out uncertainties, proving useful for supramolecular chemistry applications.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Chemical Measurement

Background:

  • Accurate measurement of host-guest binding affinities is crucial for understanding molecular interactions.
  • Existing methods for determining binding constants often suffer from significant uncertainties due to solvation and solvent effects.

Purpose of the Study:

  • To introduce a novel approach for accurate and comparable measurement of host-guest binding affinities.
  • To develop a method that minimizes uncertainty by measuring differences in binding strength (ΔlogKass) instead of absolute values.

Main Methods:

  • Applied the difference measurement approach to quantify the binding of 28 synthetic anion receptors to acetate in acetonitrile.
  • Assessed potential deprotonation of acidic receptors by measuring relative acidities (ΔpKa) against acetic acid.
  • Constructed a self-consistent binding affinity scale anchored to independently determined absolute binding constants.

Main Results:

  • A highly accurate and self-consistent binding affinity scale for anion receptors was established with a consistency standard deviation of 0.04 log units.
  • The scale spans approximately 2.7 log units, covering a range of binding strengths.
  • Demonstrated the utility of the method for a diverse set of synthetic receptors including indolocarbazoles, ureas, and thioureas.

Conclusions:

  • The developed method provides a robust and accurate way to measure and compare host-guest binding affinities.
  • This approach significantly reduces errors associated with solvent and guest solvation states.
  • The technique is expected to be widely applicable for quantifying various binding processes in supramolecular chemistry.