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The title benzimidazole molecule, C8H8N4O2·2H2O, is planar with a maximum deviation of 0.079 (2) Å (for one of the O atoms in the nitro group). It crystallized as a dihydrate and intermolecular O—H⋯O and N—H⋯O hydrogen bonds link the uncoordinated water molecules, and the nitro and amine groups, respectively. In the crystal, N—H⋯O, O—H⋯N, O—H⋯O and C—H⋯O hydrogen bonds link the molecules to form a three-dimensional network. A π–π contact between the benzene rings, [centroid–centroid distance = 3.588 (1) Å] may further stabilize the crystal structure.