The distribution of the anion (TFSI -) around the TBT and 2 TBTs setup, shown in the ESI (Fig. ), is similar to that of Li + but with lower magnitude. The peak in the anion distribution occurs at approximately 5 Å from the center of mass (COM) of TBT, further away than for Li + , indicating a weaker interaction in comparison to the cation-π interaction and the formation of a significant dipolar salt ion-pair structure.