Cation-π Interactions in Material and Biological Systems
Summary
Cation-π interactions arise when a positively charged ion approaches the electron-rich face of an aromatic ring, generating a stabilising electrostatic and polarisation-driven binding. In materials science, these forces govern ion adsorption on carbon-based nanostructures, intercalation in layered hosts and selectivity in membrane channels, with implications for energy storage, desalination and gas capture. In biology, cation-π contacts between protonated side chains (for example Arg⁺, Lys⁺ or His⁺) and aromatic residues (Phe, Tyr, Trp) contribute decisively to protein folding, ligand recognition, enzyme catalysis and ion-channel gating. Unlike many noncovalent forces, cation-π interactions retain considerable strength in aqueous environments and are relatively insensitive to pH, making them attractive in drug design and synthetic receptor engineering. Advances in computational chemistry, surface-force apparatus measurements and spectroscopic techniques have refined our understanding of how solvation, dielectric environment and aromatic topology modulate these interactions. The global significance spans sustainable technologies—such as selective ion capture and carbon dioxide adsorption—to biomedicine, where cation-π binding underpins signal transduction and molecular recognition across diverse organisms.
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Cation-π Interactions in Material and Biological Systems publication trend
The graph below shows the total number of articles in cation-π interactions in material and biological systems across all publications each year (not limited to Nature Index journals).
Technical terms
Cation-π interaction: A noncovalent attraction between a positively charged ion and the electron-rich face of an aromatic π-system.
Desolvation: The removal of a solvation shell, typically water molecules, from an ion or molecule prior to binding.
π-plane: The planar region of an aromatic ring system that contains delocalised π-electrons.
Intercalation: The insertion of ions or molecules between the layers of a host structure, such as graphite.
References
- Complex Formation of Ag+ and Li+ with Host Molecules Modeled on Intercalation of Graphite. Molecules (2024).
- Water and the Cation−π Interaction. Journal of the American Chemical Society (2021).
- Exploring Strong Interactions in Proteins with Quantum Chemistry and Examples of Their Applications in Drug Design. PLOS ONE (2015).
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