1-Chloro­methyl-1,4-diazo­niabicyclo­[2.2.2]octane bis­(hexa­fluoro­phosphate)

In the crystal structure of the title compound, C7H15ClN2 2+·2PF6 −, the cations and anions are linked by inter­molecular N—H⋯F hydrogen bonds

Bis(2-ethyl-1H-imidazol-3-ium) tetra­chloridomercurate(II)

The crystal structure of the title compound, (C5H9N2)2[HgCl4], consists of discrete tetra­chloridomercurate dications and discrete 2-methyl­imidazolium cations. In the complex anion, the mercury cations are coordinated by four chloride anions with distances between 2.4568 (14) and 2.4936 (15) Å in a tetra­hedral geometry. In the crystal, the cations and anions are connected by inter­molecular N—H⋯Cl inter­actions. One C atom of the cations is disordered and was refined using a split model (occupancy ratio 0.75:0.25)

1H-Pyrazol-2-ium hydrogen oxalate

In the title compound, C3H5N2 +·C2HO4 −, the anions form centrosymmetric dimers through cyclic O—H⋯O hydrogen-bonding associations [graph set R 2 2(10)]. These dimers are then linked through a cyclic R 4 2(10) N—H⋯O hydrogen-bonding association involving two cations and the carboxyl O-atom acceptors of separate anions, giving chain structures extending across the (111) plane

Di-μ3-chlorido-tetra-μ2-chlorido-dichloridobis(dimethyl­formamide-κO)hexa­kis­(1H-imidazole-κN 3)tetra­cadmium

The centrosymmetric mol­ecule of the title complex, [Cd4Cl8(C3H4N2)6(C3H7NO)2], contains four CdII atoms, six imidazole, two dimethyl­formamide and eight chloride ligands. The structure shows a novel chloride-bridged tetra­nuclear cadmium quasi-cubane cluster. The coordination geometry of all CdII atoms is distorted octa­hedral, with the two metal atoms in the asymmetric unit in different coordination environments. One of the Cd2+ ions is coordinated by five Cl− ions and by one N atom from an imidazole ligand, while the second is coordinated by three chloride ligands, two N atoms from two imidazole ligands and one O atom from a dimethyl­formamide mol­ecule. Inter­molecular N—H⋯Cl hydrogen bonds link the mol­ecules into a two-dimensional polymeric structure parallel to the ab plane

catena-Poly[[bis­(1-ethyl-1H-imidazole-κN 3)cadmium]-di-μ-chlorido-[(1-ethyl-1H-imidazole-κN 3)cadmium]-di-μ-chlorido-[(1-ethyl-1H-imidazole-κN 3)cadmium]-di-μ-chlorido-[bis­(1-ethyl-1H-imidazole-κN 3)cadmium]]

The asymmetric unit of the crystal structure of the title compound, [Cd2Cl4(C5H8N2)3]n, contains two CdII cations, three 1-ethyl-1H-imidazole ligands, and four Cl− anions. The two CdII atoms have quite different coordination environments: one is octa­hedrally coordinated by four Cl atoms and two N atoms from two 1-ethyl-1H-imidazole ligands, and the second is in a severely distorted fivefold coordination by four Cl atoms and one N atom from a 1-ethyl-1H-imidazole ligand. Adjacent CdII cations are inter­connected alternately by pairs of chloride bridges, generating an infinite step-like chain along the a axis. One ethyl group of the 1-ethyl-1H-imidazole ligand is disordered over two sets of sites with a 0.668 (13):0.332 (13) site-occupancy ratio

Aqua­bis­(1-methyl-1H-imidazole-κN 3)bis­(nitrato-κO)copper(II)

The title complex mol­ecule, [Cu(NO3)2(C4H6N2)2(H2O)], has crystallographically imposed twofold symmetry. The CuII atom displays a distorted square-pyramidal CuN2O3 coordination geometry. In the crystal, inter­molecular O—H⋯O hydrogen bonds between the coordinated water mol­ecule and the nitrate anions form chains parallel to the c axis

2-Ethyl-1H-imidazol-3-ium hemioxalate oxalic acid monohydrate

In the title compound, C5H9N2 +·0.5C2O4 2−·C2H2O4·H2O, the anions, cations and water mol­eculars are linked by N—H⋯O and O—H⋯O hydrogen bonds which define a tightly bound three-dimensional structure. The title compound is a layered structure as viewed along the a or c axis; one layer contains water and oxalic acid mol­ecules, the other the imidazolium cation. The C atoms of the ethyl group of the 2-ethyl­imidazolium cation are disordered over two positions of equal occupancy

Bis(2-ethyl-1H-imidazol-3-ium) tetra­chloridocuprate(II)

In the crystal structure of the title salt, (C5H9N2)2[CuCl4], the organic cations and the tetrahedral [CuCl4] anions are linked into a three-dimensional network by N—H⋯Cl hydrogen bonds. The two 2-ethyl imidazolium cations in the asymmetric unit differ in the orientation of the ethyl group, with N—C—C—C torsion angles of −170.0 (4) and −87.6 (5)°

Dichloridotris(2-methyl-1H-imidazole-κN 3)cadmium

In the title compound, [CdCl2(C4H6N2)3], the CdII atom displays a penta­coordinate CdN3Cl2 coordination geometry, being coordinated by an N atom of three 2-methyl­imidazole ligands and two Cl atoms. In the crystal, the mononuclear complexes are linked by N—H⋯Cl hydrogen bonds into a two-dimensional network in the ab plane

Di-μ-nitrito-κ4 O:O-bis­[bis­(1-ethyl-1H-imidazole-κN 3)(nitrito-κO)copper(II)]

In the structure of the title compound, [Cu2(NO2)4(C5H8N2)4], the asymmetric unit consists of two moieties containing one Cu ion, two nitrite ions and two 1-ethyl-1H-imidazole mol­ecules associated via weak Cu—O inter­actions. Each CuII atom displays an elongted square-pyramidal CuN2O3 coordination geometry with a slight tetra­hedral distortion in the basal plane. The dimeric units are linked into a three-dimensional network by C—H⋯O hydrogen bonds