It was also observed that xdic had noticeable effects on the chemical shifts of some of the signals from the hydrogen atoms in the dicamba anion, although these differences were far less pronounced than that of the signal from the methylene group in the MCPA anion described Considering that the directions of the chemical shifts change for each ion, specific conclusions can be drawn about the nature of the interion interactions in DSILs. Owing to its higher basicity, the MCPA anion (pKa = 3.07) likely outcompetes the dicamba anion (pKa = 1.87) for cation of the increased importance of the cation-dicamba anion interactions. Similar conclusions have been made on such grounds previously for other systems, in which differences in interion interactions have been explained by the difference in basicity between tetrafluoroborate and bistriflimide anions, in favor of the former .