The interaction energies obtained for both 1 and 2 are smaller than the models used in the previous sections based on ammonium and guanidinium (Table ). Furthermore, the distances between the anion and the theoretically positively charged atom, N + , are smaller than those observed in the corresponding similar models examined earlier, both models based on ammonium and guanidinium. These distances range between 3.39 and 3.60 Å for 1 and, 2.54 and 2.97 Å for 2, respectively. We performed the same analysis of the interactions upon complexation, i.e. LMO-EDA, NBO, and QTAIM (SIXXX).