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A computational study of anion-modulated cation-π interactions.

Jorge A Carrazana-García¹, Jesús Rodríguez-Otero, Enrique M Cabaleiro-Lago

¹Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, Campus de Lugo, Avenida Alfonso X El Sabio s/n, 27002 Lugo, Spain.

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Summary

Computational studies reveal how anions affect cation-π interactions involving guanidinium and benzene. Anion influence is primarily through polarization, with effects depending on relative positions, impacting biological molecule interactions.

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Area of Science:

Computational Chemistry
Supramolecular Chemistry
Biophysical Chemistry

Background:

Cation-π interactions are crucial in biological systems, involving positively charged amino acid residues and aromatic systems.
Understanding how other species, like anions, modulate these interactions is vital for comprehending molecular recognition and function.
Guanidinium is a biologically relevant cation, and benzene serves as a model π system.

Purpose of the Study:

To computationally investigate the influence of anions on cation-π complexes formed between guanidinium and benzene.
To analyze the energetic contributions and structural factors governing these ternary interactions.
To elucidate the role of polarization and three-body effects in anion-modulated cation-π interactions.

Main Methods:

Potential energy surface scans to map interaction landscapes.
Supermolecule calculations to determine interaction energies of ternary complexes (guanidinium-benzene-anion).
Local molecular orbital energy decomposition analysis (LMO-EDA) to dissect interaction energies into components (electrostatic, polarization, dispersion, etc.).

Main Results:

Anion interaction with the guanidinium-benzene complex is significantly influenced by polarization effects.
The relative positioning of the cation, anion, and π system dictates the nature of three-body interactions (cooperative or anticooperative).
Anticooperative three-body effects occur when the cation and anion are on the same side of the π system; cooperative effects occur when they are on opposite sides.

Conclusions:

Anions modulate cation-π interactions primarily through polarization, altering the binding energy and geometry.
The spatial arrangement of interacting species is critical for determining the overall binding stability and mechanism.
This study provides novel insights into anion-guanidinium-π system interactions, relevant to biological contexts.