Detailed 1 H NMR spectra of each system and 13 (Supplementary Data). The occurrence on each of the analyzed spectra of a broad signal of high intensity in the range from 3650 to 3050 cm -1 originating from stretching vibrations in the O-H bonds is indicated by the formation of numerous hydrogen bonds, most likely both between the ions of the analyzed systems, and also between the hydroxyl group and water that remains in the ILs and DSILs after drying.