Furthermore, we find that the terms associated with polarisation, exchange, and dispersion, although lower than those observed for the iminium/imine systems, are higher than those observed for the pure ionic systems, indicating their non-negligible contribution. Additionally, the repulsion term is lower than that of the iminium-charged systems but higher than the N(CF 3 ) 4 -X systems. Thus, it appears that the ammonium salts studied herein exhibit a behaviour that lies between the HB-assisted ion pairs and the longer-range ion pairs.