organic compounds
Open access
In the title compound, C13H9BrClNO, the dihedral angle between the substituted benzene rings is 44.25 (11)°. There are strong intramolecular O—HN hydrogen bonds, which generate S(6) rings, and also intermolecular ClCl [3.431 (3) Å] and Br Br [3.846 (1) Å] contacts. The crystal packing a C—HO and C—Hπ interactions.
data reports
Open access
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—HO, O—HO and O—HN 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—HO hydrogen bonds, forming a three-dimensional structure. There are also C=Oπ interactions present [Oπ 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)°.