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In the title compound, C13H9BrClNO, the dihedral angle between the substituted benzene rings is 44.25 (11)°. There are strong intra­molecular O—H...N hydrogen bonds, which generate S(6) rings, and also inter­molecular Cl...Cl [3.431 (3) Å] and Br... Br [3.846 (1) Å] contacts. The crystal packing a C—H...O and C—H...π inter­actions.

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In the crystal of the title hydrated salt, C6H7N4+·C4H5O6·0.5H2O, the bi­imidazole monocation, 1H,1′H-[2,2′-biimidazol]-3-ium, is hydrogen bonded, via N—H...O, O—H...O and O—H...N hydrogen bonds, to the hydrogen tartrate anion and the water mol­ecule, which is located on a twofold rotation axis, forming sheets parallel to (001). The sheets are linked via C—H...O hydrogen bonds, forming a three-dimensional structure. There are also C=O...π inter­actions present [O...π distances are 3.00 (9) and 3.21 (7) Å], involving the carbonyl O atoms and the imidazolium ring, which may help to consolidate the structure. In the cation, the dihedral angle between the rings is 11.6 (2)°.
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