The pentafluorophenyl group as π-acceptor for anions: a case study

Area of Science:

• Solid-state chemistry
• Supramolecular chemistry
• Organic crystal engineering

Background:

• Anion-π interactions are crucial in crystal engineering and materials science.
• Understanding these interactions requires detailed structural analysis.
• Fluorophenyl groups are common motifs in organic materials.

Purpose of the Study:

• To comprehensively investigate anion-π interactions in the solid state.
• To analyze the geometrical variability and directing effects in these interactions.
• To explore the application of the hapticity concept and new criteria for describing anion-π bonding.

Main Methods:

• Statistical analysis of crystallographic data sets.
• Focus on purely organic, charge-neutral fluorophenyl systems with side-chain positive charges.
• Application of the hapticity concept and novel evaluation criteria.

Main Results:

• Demonstrated significant geometrical variability in solid-state anion-π bonding.
• Identified directing substituents on arenes as critical for anion positioning.
• Characterized the structural diversity of interactions between anions and electron-deficient arenes.

Conclusions:

• Substituent effects are key determinants of anion placement in anion-π interactions.
• The hapticity concept provides a useful framework for describing these interactions.
• This work offers tools for better understanding and designing solid-state architectures involving anion-π systems.