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Figure 1 The structure of (I), showing 50% probability displacement ellipsoids for non-H atoms. H atoms are of arbitrary size. Unlabeled atoms of the imidazolium cation are related to labeled atoms by 3/2-x, 3/2-y, −z; for the anion, the symmetry operation for Br1 is 1-x + 1, y, 1/2-z. |