Molecular Interaction Potential with Polarization (MIPp) Study of the Interplay Between Ion-π and Hydrogen Bonding Interactions

Study of the Interplay Between Ion-π and Hydrogen Bonding Interactions David Qui onero, Daniel Escudero, Antonio Frontera and Pere M. Deyà Pp 36-41 The interplay between cation-π and hydrogen bonding interactions involving aromatic rings is studied by means of Molecular Interaction Potential with polarization (MIPp) calculations. We have analyzed the effect of the participation of the aromatic in hydrogen bonding interactions on the ion-binding affinity of the arene, by means of Molecular Electrostatic Potential (MEP), MIPp and ab initio calculations. We have observed that when the aromaric ring participates in hydrogen bonding interaction as hydrogen bond (HB) donor its capacity for interacting with cations (cation-π interaction) augments. In addition when the arene is forming hydrogen bonding interactions as HB acceptors, the capacity of the aromatic ring for interacting with anion increments (anion-π interaction). This mutual influence of cation-π and HB interactions is studied and analyzed by means of the MIPp partition scheme.