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Figure 2 Crystal packing diagrams showing three-dimensional framework formed by hydrogen-bonded cations and anions (a) and the [001] chain of hydrogen- bonded imidazole molecules (b). Only H atoms involved in hydrogen bonding are shown. Hydrogen bonds are shown with dashed lines. Symmetry code: (i)1 − x, 1 − y, 1 − z; (ii) x-1, y, z. |