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The aromatic C2 Im cation (Figure 1) was found to be a planar minimum on the potential energy surface (PES). A methyl group was then added to one of the nitrogen atoms to give methylimidazolium (Mim) in one of two possible orientations of Cs symmetry. Structure Mim 2 has one imaginary frequency (methyl rotation, 100i cm 1) of irreducible representation A¡ä¡ä and is higher in energy than the stable Mim 1 structure (Table 1). Given this result, a second methyl group bound to the other nitrogen atom should have the same orientation as in Mim 1, and, indeed, a stable C2 structure for dimethylimidazolium (Dmim) was found.
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