organic compounds
Open access
The title compound, C9H8Br2N2O3, is planar (r.m.s. deviation = 0.030 Å) with the exception of the terminal methyl group which lies out of the plane [1.219 (3) Å]. The conformation about the C=N double bond [1.268 (3) Å] is E. An intramolecular N—HN hydrogen bond occurs. Linear supramolecular chains along the b axis mediated by O—HO hydrogen-bonding interactions feature in the crystal structure. These chains are also stabilized by weak C—HN contacts.
organic compounds
Open access
In the title hydrated salt, C15H11Br2N2+·Cl−·2H2O, the complete imidazolium cation is generated by a crystallographic twofold axis, with one C atom lying on the axis. The chloride ion and both water molecules of crystallization also lie on a crystallographic twofold axis of symmetry. The cation is non-planar, the dihedral angle formed between the central imidazolium and benzene rings being 12.9 (3)°; the dihedral angle between the symmetry-related benzene rings is 25.60 (13)°. In the crystal, O—HCl hydrogen bonds result in supramolecular chains along c mediated by eight-membered {HOHCl}2 synthons. These are consolidated by C—HO and π–π [centroid–centroid distance = 3.687 (3) Å] interactions.