The values obtained for the electron density and ∇ 2 ρ(r) in Table 2 reinforce our previous analysis of the ionic nature of the salts studied and will be used as a reference for analysing the nature of the remaining systems. The QTAIM analysis was performed for the N(CF 3 ) 4 -X systems under study, and the corresponding values are provided in the Supplementary Information (Table .2) for clarity. Of these, a representative example has been chosen to highlight the presence and values of BCPs, as shown in Figure . When the density values are analysed at the various BCPs, it becomes apparent that the interactions within the ammonium salts are comparatively weaker. Furthermore, the Laplacian values indicate the presence of non-covalent interactions; however, they do not reach the magnitude observed in the pure ionic salts (∇ 2 ρ(r) ranges between 0.1 and 0.2 a.u.).