“…Because hydrogen bonds were subject to many extensive discussions in literature, we show in Figure only for selected examples the corresponding combined distribution function for the hydrogen bonds between chloride and the cation as well as the EG. It is clear from these examples and from literature that the hydrogen bonds in the different DES are all very strong, because they exhibit an extremely directional behavior, i. e., angles a (Cl−H−O) are close to 180 degrees and the peaks extend only to 165 degrees. This is different for aprotic ionic liquids, see for example [51, 55, 56], where usually such a directionaly cannot be achieved, because the donor atom often is a carbon atom.…”