2-Hy­droxy­methyl-1,3-dimethyl­imidazolium iodide

The crystal packing of the title compound, C6H11N2O+·I−, can be described as inter­calated layers lying parallel to (010), with the iodide ions located between the cations. A weak intra­molecular C—H⋯O hydrogen bond occurs within the cation. In the crystal, inter­molecular O—H⋯I hydrogen bonds result in the formation of a three-dimensional network and reinforce the cohesion of the ionic structure

4,5-Dibromo-1,2-dimethyl-1H-imidazol-3-ium bromide

In the title salt, C5H7Br2N2 +·Br−, the cation and anion are connected by an N—H⋯Br hydrogen bond. In the crystal, there are inter­calated layers parallel to (10-2) in which bromide ions are located between the cations. Weak inter­molecular C—H⋯Br hydrogen bonds are also observed

2-p-Tolyl-2,3-dihydroquinolin-4(1H)-one

In the title molecule, C16H15NO, the tetrahydropyridine ring is in a sofa conformation with the methine C atom forming the flap. The dihedral angle between the benzene rings is 80.85 (8)°. In the crystal, molecules are arranged in alternating double layers parallel to (100) and are connected along [001] by N—H...O hydrogen bonds. In addition, weak C—H...π interactions are observed

2-(4-Chlorophenyl)-2,3-dihydroquinolin-4(1H)-one

The title molecule, C15H12ClNO, features a dihydroquinolin-4(1H)-one moiety attached to a chlorobenzene ring. The heterocyclic ring has a half-chair conformation with the methine C atom lying 0.574 (3) Å above the plane of the five remaining atoms (r.m.s. deviation = 0.0240 Å). The dihedral angles between the terminal benzene rings is 77.53 (9)°, indicating a significant twist in the molecule. In the crystal, supramolecular zigzag chains along the c-axis direction are sustained by N—H...O hydrogen bonds. These are connected into double chains by C—H...π interactions

Crystal structure of catena-poly[1,3-dibenzylbenzimidazolium [[chloridomercurate(II)]-di-μ-chlorido]]

The asymmetric unit of the polymeric title compound, {(C21H19N2)[HgCl3]}n, comprises one-half of the cationic molecule, the other half being generated by application of twofold rotation symmetry, one Hg and two Cl atoms. The HgII atom, lying on a twofold rotation axis, exhibits a distorted triangular coordination environment and is surrounded by three Cl atoms with Hg—Cl distances in the range 2.359 (2)–2.4754 (13) Å. Two additional longer distances [Hg...Cl = 3.104 (14) Å] lead to the formation of polymeric [HgCl1/1Cl4/2]− chains extending along [001]. The crystal packing can be described by cationic layers alternating parallel to (-110) with the anionic chains located between the layers. The packing is consolidated by π–π stacking interactions between the benzene rings of the central benzimidazole entities, with centroid-to-centroid distances of 3.643 (3) Å