A computational study of anion-modulated cation-π interactions

The Journal of Physical Chemistry. B
Jorge A Carrazana-GarcíaEnrique M Cabaleiro-Lago

Abstract

The interaction of anions with cation-π complexes formed by the guanidinium cation and benzene was thoroughly studied by means of computational methods. Potential energy surface scans were performed in order to evaluate the effect of the anion coming closer to the cation-π pair. Several structures of guanidinium-benzene complexes and anion approaching directions were examined. Supermolecule calculations were performed on ternary complexes formed by guanidinium, benzene, and one anion and the interaction energy was decomposed into its different two- and three-body contributions. The interaction energies were further dissected into their electrostatic, exchange, repulsion, polarization and dispersion contributions by means of local molecular orbital energy decomposition analysis. The results confirm that, besides the electrostatic cation-anion attraction, the effect of the anion over the cation-π interaction is mainly due to polarization and can be rationalized following the changes in the anion-π and the nonadditive (three-body) terms of the interaction. When the cation and the anion are on the same side of the π system, the three-body interaction is anticooperative, but when the anion and the cation are on opposite sides of the...Continue Reading

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Nov 14, 2012·Chemical Reviews·A Subha Mahadevi, G Narahari Sastry
Oct 9, 2014·Organic & Biomolecular Chemistry·Jorge A Carrazana-GarcíaJesús Rodríguez-Otero
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