Hydrogen‐ and Halogen‐Bonds between Ions of like Charges: Are They Anti‐Electrostatic in Nature?

Recent theoretical studies suggested that hydrogen bonds between ions of like charges are of a covalent nature due to the dominating nD→σ*H‐A charge‐transfer (CT) interaction. In this work, energy profiles of typical hydrogen (H) and halogen (X) bonding systems formed from ions of like charges are explored using the block‐localized wavefunction (BLW) method, which can derive optimal geometries and wave functions with the CT interaction “turned off.” The results demonstrate that the kinetic stability, albeit reduced, is maintained for most investigated systems even after the intermolecular CT interaction is quenched. Further energy decomposition analyses based on the BLW method reveal that, despite a net repulsive Coulomb repulsion, a stabilizing component exists due to the polarization effect that plays significant role in the kinetic stability of all systems. Moreover, the fingerprints of the augmented electrostatic interaction due to polarization are apparent in the variation patterns of the electron density. All in all, much like in standard H‐ and X‐bonds, the stability of such bonds between ions of like charges is governed by the competition between the stabilizing electrostatic and charge transfer interactions and the destabilizing deformation energy and Pauli exchange repulsion. While in most cases of “anti‐electrostatic” bonds the CT interaction is of a secondary importance, we also find cases where CT is decisive. As such, this work validates the existence of anti‐electrostatic H‐ and X‐bonds. © 2017 Wiley Periodicals, Inc.

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