Precise Recognition in Water by an Endo-Functionalized Cavity: Tuning the Complementarity of Binding Sites

Area of Science:

• Supramolecular Chemistry
• Molecular Recognition
• Host-Guest Chemistry

Background:

• Biomolecular recognition relies on precise binding to similar substrates.
• Synthetic host selectivity, especially for subtle differences, remains a challenge.

Purpose of the Study:

• To design a novel synthetic receptor with high selectivity for hydrogen-bonding complementary substrates.
• To investigate the role of cavity dimensions and hydrophobic interactions in binding affinity and selectivity.

Main Methods:

• Designing synthetic hosts by combining rigid skeletons to control cavity dimensions.
• Utilizing X-ray crystallography and density functional theory (DFT) for structural and electronic analysis.
• Employing thermodynamic measurements and molecular dynamics (MD) simulations to study binding interactions.

Main Results:

• A novel receptor design achieved highly selective recognition of substrates like 4-chromanone via hydrogen bonding.
• Cavity dimensions, controlled by rigid skeletons, were confirmed as critical for selectivity.
• Hydrophobic cavity effects significantly influenced binding affinity, as shown by thermodynamic and MD data.

Conclusions:

• The developed receptor demonstrates high selectivity and affinity for specific substrates.
• This strategy offers valuable insights for designing customized receptors for precise molecular recognition.
• Controlling endo-functional group distances within rigid cavities is key for selective host-guest complexation.