Cation-π vs. π-π interactions: Complexes of 2-pyridinylguanidinium derivatives and aromatic systems

► 2-Pyridinylguanidiniums form cation-π and π-π complexes with (hexafluoro)benzene. ► Interactions in complexes studied by AIM, NBO and electron-density difference maps. ► Cation-π and π-π effect on aromaticity studied by NICS and NICS isodensity surface.