
Current density plots of closed‐shell intermolecular HH interactions characterized by a bond critical point (BCP) show two vortices separated by a saddle, a pattern which allows for a clear definition of a pair current strength. This HH current strength turns out to be roughly related to the potential energy density at the BCP and then to the dissociation energy. The same pattern is also recognizable, at least for an azimuthal orientation of a field perpendicular to the HH line, for the intramolecular interactions previously investigated to propose the HH bonding. In the case of the H atoms of the bay region of polycyclic aromatic hydrocarbons, the current of the HH delocalized diatropic vortex gives a quantitative indication of stabilization; however, on rotation of the field and the subsequent onset of a bay‐delocalized paratropic vortex (a typical signature of antiaromaticity), the diatropic vortex can be reshaped or it can even disappear, consistently with its smallness, and thus showing the effect of other more relevant interactions. © 2015 Wiley Periodicals, Inc.
H bonding; aromaticity; bay region; bond critical point; potential energy density
H bonding; aromaticity; bay region; bond critical point; potential energy density
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