Statistical analysis of σ-holes: a novel complementary view on halogen bonding

Area of Science:

• Medicinal Chemistry
• Computational Chemistry
• Structural Biology

Background:

• Noncovalent interactions, particularly halogen bonding, are vital in molecular recognition and drug design.
• The σ-hole, a region of positive electrostatic potential, is a key feature governing halogen bonding.
• Understanding σ-hole behavior in organic molecules is essential for predicting binding affinities.

Purpose of the Study:

• To analyze electrostatic potential (ESP) maps of over 2500 organic compounds.
• To simplify the concept and general trends of σ-holes in drug-like molecules.
• To enhance chemical intuition regarding halogenated compounds in biological contexts.

Main Methods:

• Computational analysis of electrostatic potential (ESP) maps.
• Systematic study of over 2500 diverse organic molecules.
• Comparison of computational findings with existing crystallographic data.

Main Results:

• Identified and characterized σ-hole regions across a large dataset of organic molecules.
• Established general trends for σ-hole properties in drug-like chemical space.
• Demonstrated good agreement between computational predictions and experimental crystallographic surveys.

Conclusions:

• The study provides a simplified view and general trends of σ-holes in organic molecules.
• Findings can improve chemists' intuition and prediction of halogen bonding interactions.
• This work contributes to a better understanding of noncovalent interactions in drug discovery.