The role of hydrogen atoms in interactions involving imidazolium-based ionic liquids

摘要: Abstract In the first part of this report experimental results are discussed which focus onto importance hydrogen atoms in interaction imidazolium-based ionic liquids. These include examples for cation–anion neat liquids as well interactions between and their molecular environment, water particular. Most studies emphasize C(2)–H group imidazolium ring intra- intermolecular interactions; commonly, type C–H … X (X =: O, halide) attributed to “hydrogen bonding”. second it is analyzed whether these consequences fulfill criteria set by standard definitions bonding. Two co-conformations at found. One co-conformer (in-plane) often resembles a bond while other one (on-top) points non-hydrogen bonding behavior. Furthermore, degree in-plane structure very dependent on anion. Spatial distribution functions show that, general, both occupied. However, question how long particular populated liquid state has yet be answered. Therefore, concluded that term bond” should, present, treated with care characterize contacts, because above-mentioned difficulties. Once more must stressed oversimplifications generalizations, even subclass have avoided, complicated than appears from sight.