The parametrization procedure described above requires that each individual cation is parametrized separately. However, given the vast diversity of symmetric and asymmetric cations, we wanted to investigate the possibility of transferring parameters of specific molecular fragments from previously parameterized imidazolium-based cations. would not be amenable as an initial structure for asymmetric nor symmetric cations, and thus [diEIm] parameters were deemed to be not transferable from the starting structures (see Supplementary Information). To form the basic structure of an asymmetric cation with a n-carbon alkyl chain, the methylene group bonded to its corresponding nitrogen in the ring was taken from [PMIm],