Bis(3-amino­pyrazine-2-carboxyl­ato-κ²N¹,O)diaqua­cobalt(II)

In the title compound, [Co(C₅H₄N₃O₂)₂(H₂O)₂], the Co^II atom is situated on a twofold rotation axis and is N,O-chelated by two 3-amino­pyrazine-2-carboxyl­ate anions and additionally bonded to the O atoms of two water mol­ecules, leading to a slightly distorted octa­hedral coordination environment. The crystal packing is dominated by inter­molecular O—H...O, O—H...N and N—H...O hydrogen bonding involving the water mol­ecules and amino groups as donors and carboxyl­ate O atoms, as well as the non-coordinating heterocyclic N atoms as acceptors, resulting in a three-dimensional network. An intra­molecular N—H...O hydrogen bond is also observed.

Bis(azido-κN)bis­[4-(dimethyl­amino)­pyridine-κN]zinc

In the title complex, [Zn(N₃)₂(C₇H₁₀N₂)₂], the Zn^II atom is coordinated by two N atoms from two 4-(dimethyl­amino)­pyridine (DMAP) ligands and by two N atoms from two azide anions in a distorted tetra­hedral coordination geometry. In the crystal, weak C—H...N hydrogen bonds between the DMAP and azide ligands link these discrete complex mol­ecules into a three-dimensional supra­molecular network.

catena-Poly[[bis­[4-(dimethyl­amino)­pyridine-κN¹]cobalt(II)]-di-μ-azido-κ⁴N¹:N³]

The title layered polymer, [Co(N₃)₂(C₇H₁₀N₂)₂]_n, contains Co^II, azide and 4-(dimethyl­amino)­pyridine (4-DMAP) species with site symmetries m2m, 2 and m, respectively. The Co²⁺ ion adopts an octa­hedral coordination geometry in which four N atoms from azide ligands lie in the equatorial plane and two 4-DMAP N atoms occupy the axial positions. The Co^II atoms are connected by two bridging azide ligands, resulting in a chain parallel to the c axis.

Poly[[diaqua­bis­(μ₂-4,4′-bipyrid­yl)cobalt(II)] dinitrate tetra­hydrate]

The title compound, {[Co(C₁₀H₈N₂)₂(H₂O)₂](NO₃)₂·4H₂O}_n, (C₁₀H₈N₂ = 4,4′-bipyridine = 4,4′-bpy) is a layered coordination polymer built up from a cationic square grid extending in (101) enclosing uncoordinating nitrate ions and water mol­ecules. The Co^II ion has site symmetry 2 and one of the 4,4′-bpy ligands is generated by twofold symmetry [two N atoms and two C atoms lie on the rotation axis and the dihedral angle between the pyridine rings is 45.66 (5)°]. The other 4,4′-bpy ligand is generated by a crystallographic inversion center. The Co^II ion exhibits a slightly distorted octa­hedral coordination geometry defined by two O atoms of two coordinating water mol­ecules and four N atoms from four bridging 4,4′-bpy ligands. The structure is consolidated by O—H...O, C—H...O and C—H...N hydrogen bonds.

4-(Dimethyl­amino)­pyridinium tetra­chloridoferrate(III)

The title salt, (C₇H₁₁N₂)[FeCl₄], consists of one essentially planar (the r.m.s. deviation for all non-H atoms being 0.004 Å) 4-(dimethyl­amino)­pyridinium cation and a tetra­hedral tetra­chloridoferrate(III) anion. The cations and anions are arranged in layers parallel to (010). Besides electrostatic inter­actions, the crystal packing features N—H...Cl and C—H...Cl hydrogen bonds between cations and anions, forming a three-dimensional network.

Bis(cinnamato-κO)(1,10-phenanthroline-κ²N,N′)copper(II)

The title mononuclear Cu^II complex, [Cu(C₉H₇O₂)₂(C₁₂H₈N₂)], is comprised of a Cu^II cation, two cinnamate (L⁻) ligands and a 1,10-phenanthroline (phen) ligand. The Cu^II atom and phen ligand lie on a twofold rotation axis. The Cu^II atom is coordinated by two O atoms from two carboxyl­ate groups of two (L⁻) ligands and two N atoms from one phen ligand, exhibiting a distorted square-planar geometry. In the crystal, mol­ecules are assembled into supra­molecular chains parallel to the c axis through weak C—H...O hydrogen bonds involving the phen and cinnamate ligands.

Bis(3-amino­pyrazine-2-carboxyl­ato-κ²N¹,O)di­aqua­nickel(II) dihydrate

In the title compound, [Ni(C₅H₄N₃O₂)₂(H₂O)₂]·2H₂O, the Ni^II ion lies on an inversion center and is coordinated in an slightly distorted octa­hedral environment by two N,O-chelating 3-amino­pyrazine-2-carboxyl­ate (APZC) ligands in the equatorial plane and two trans-axial aqua ligands. In the crystal, O—H...O, N—H...O and O—H...N hydrogen bonds involving the solvent water mol­ecules, aqua and APZC ligands form layers parallel to (010). These layers are linked further via O—H...O, N—H...O and C—H...O hydrogen bonds involving the axial aqua ligands, amino groups and the carboxyl­ate groups of the APZC ligands, forming a three-dimensional network.

(Adipato-κ²O,O′)di­aqua­[bis­(pyridin-2-yl-κN)amine]­cobalt(II) trihydrate

In the monomeric title complex, [Co(C₆H₈O₄)(C₁₀H₉N₃)(H₂O)₂]·3H₂O, the distorted octa­hedral CoN₂O₄ coordination environment comprises two N-atom donors from the bidentate di­pyridyldi­amine ligand, two O-atom donors from one of the carboxyl­ate groups of the bidentate chelating adipate ligand and two water mol­ecules. In addition, there are three solvent water mol­ecules which are involved in both intra- and inter-unit O—H...O hydrogen-bonding inter­actions, which together with an amine–water N—H...O hydrogen bond produce a three-dimensional framework.

Poly[[penta­aqua­bis­(μ₃-hydrogen squarato)barium] monohydrate]

The crystal structure of the title compound, {[Ba(C₄HO₄)₂(H₂O)₅]·H₂O}_n, consists of discrete double chains propagating along [010]. The chains are formed by Ba^II ions linked by bridging hydrogen squarate ligands in a trans-bis-monodentate mode. In addition, the bridging hydrogen squarate ligands connect the chains into a ladder structure via a third coordinating O atom. The remaining coordination sites are occupied by five aqua ligands and a second mondendate hydrogen squarate ligand, forming a slightly distorted tricapped trigonal–prismatic geometry. O—H...O hydrogen bonds link the chains and solvent water mol­ecules into a three-dimensional network.

4-(Di­methyl­amino)­pyridinium trichlorido[4-(di­methyl­amino)­pyridine-κN]cobaltate(II)

In the anion of the title compound, (C₇H₁₁N₂)[CoCl₃(C₇H₁₀N₂)], the Co^II ion is coordinated by one N atom from a 4-(di­methyl­amino)­pyridine (DMAP) ligand and three Cl atoms, forming a CoNCl₃ polyhedron with a distorted tetra­hedral geometry. In the crystal, cations and anions are linked via weak N—H...Cl and C—H...Cl hydrogen bonds. Double layers of complex anions stack along the b- axis direction, which alternate with double layers of 4-(di­methyl­amino)-pyridinium cations.

catena-Poly[bis­(μ₃-2-phenyl­acetato-κ³O,O′:O)bis­(μ₂-2-phenyl­acetato-κ²O:O′)dicopper(II)(Cu—Cu)]

The title polymeric compound, [Cu₂(C₈H₇O₂)₄]_n, was synthesized by the reaction of copper acetate with aqueous phenyl­acetic acid. The unique Cu^II atom is coordinated by five O atoms from the carboxyl­ate groups of phenyl­acetate ligands, and the strongly distorted octa­hedral coordination environment is completed by a Cu—Cu bond of 2.581 (2) Å, at whose mid-point is located an inversion centre. The crystal structure consists of infinite polymeric linear chains of Cu²⁺ ions, running along [100], linked by bridging phenyl­acetate groups.

Bis{1-[(E)-(2-chloro­phen­yl)diazen­yl]naphthalen-2-olato}copper(II)

The Cu^II atom in the title compound, [Cu(C₁₆H₁₀ClN₂O)₂], is located on an inversion center and is tetra­coordinated by two N and two O atoms from two bidentate 1-[(E)-(2-chloro­phen­yl)diazen­yl]naphthalen-2-olate ligands, forming a square-planar complex. In the crystal, mol­ecules are linked via weak C—H...O and C—H...Cl hydrogen bonds, forming chains propagating along [010]. There are also π–π inter­actions present involving adjacent naphthalene rings [centroid–centroid distance = 3.661 (13) Å].

2-(2-Nitro­phenyl­sulfin­yl)acetonitrile

In the title compound, C₈H₆N₂O₃S, the dihedral angle between the nitro group and the benzene ring is 6.76 (9)°. The bond-angle sum at the S atom is 308.1°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds to generate (010) sheets. The crystal studied was found to be a racemic twin.

Di­aqua­bis­[2-(2-hy­droxy­eth­yl)pyridine-κ²N,O]cobalt(II) dichloride

In the title salt, [Co(C₇H₉NO)₂(H₂O)₂]Cl₂, the Co^II cation, located on an inversion center, is N,O-chelated by two hy­droxy­ethyl­pyridine ligands and coordinated by two water mol­ecules in a distorted O₄N₂ octa­hedral geometry. In the crystal, the Cl⁻ anions link with the complex cations via O—H...Cl hydrogen bonds, forming a three-dimensional supra­molecular architecture. π–π stacking is observed between the pyridine rings of adjacent mol­ecules [centroid–centroid distance = 3.5810 (11) Å].

Di-μ-chlorido-bis­[(2-amino­benzamide-κ²N²,O)chlorido­copper(II)]

The title compound, [Cu₂Cl₄(C₇H₈N₂O)₂], crystallizes as discrete [CuLCl₂]₂ (L = 2-amino­benzamide) dimers with inversion symmetry. Each Cu^II ion is five-coordinated and is bound to two bridging chloride ligands, a terminal chloride ligand and a bidentate 2-amino­benzamide ligand. The crystal structure exhibits alternating layers parallel to (010) along the b-axis direction. In the crystal, the components are linked via N—H...Cl hydrogen bonds, forming a three-dimensional network. These inter­actions link the mol­ecules within the layers and also link the layers together and reinforce the cohesion of the structure.

Tetra­kis(μ-2-phenyl­acetato-κ²O:O′)bis­{[4-(di­methyl­amino)­pyridine-κN¹]cobalt(II)}

The title compound, [Co₂(C₈H₇O₂)₄(C₇H₁₀N₂)₂], crystallizes as a centrosymmetric dimer containing two Co^II atoms bridged by four bidentate phenyl­acetate ligands in syn–syn bridging modes. Each Co^II atom is five-coordinated by four O atoms from four different carboxyl­ate ligands and the ring N atom of a 4-(di­methyl­amino)­pyridine unit, generating a distorted square-pyramidal geometry in which the four O atoms form the basal plane and the N atom occupies the axial position. In the crystal, C—H...O inter­actions link the dinuclear complex mol­ecules into a three-dimensional network.

Bis[4-(di­methyl­amino)­pyridinium] tetra­chlorido­cuprate(II)

The asymmetric unit of the title salt, (C₇H₁₁N₂)₂[CuCl₄], comprises half a tetrahedral tetra­chlorido­cuprate anion, being located on a twofold axis, and a protonated 4-(di­methyl­amino)­pyridine cation. The geometry around the Cu^II ion is highly distorted with the range of Cl—Cu—Cl angles being 94.94 (1)–141.03 (1)°. The crystal structure is stabilized by N—H...Cl and C—H...Cl hydrogen bonds. In the three-dimensional network, cations and anions pack in the lattice so as to generate chains of [CuCl₄]²⁻ anions separated by two orientations of cation layers, which are inter­locked through π–π stacking contacts between pairs of pyridine rings, with centroid–centroid distances of 3.7874 (7) Å.

2,2′-(Disulfanedi­yl)dianilinium dichloride dihydrate

In the title hydrated mol­ecular salt, C₁₂H₁₄N₂S₂²⁺·2Cl⁻·2H₂O, the dihedral angle between the benzene rings in the dication is 9.03 (17)° and the C—S—S—C torsion angle is 96.8 (2)°. The crystal packing can be described as alternating organic and anionic water layers lying parallel to (100), which are linked by N—H...Cl and N—H...O hydrogen bonds. O—H...Cl hydrogen bonds and aromatic π–π stacking inter­actions [centroid–centroid separation = 3.730 (3) Å] are also observed.

2-Hy­droxy­methyl-1,3-dimethyl-1H-imidazol-3-ium triiodide

The crystal packing of the title salt, C₆H₁₁N₂O⁺·I₃⁻, can be described as consisting of alternating layers of cations and anions parallel to the (100) plane along the a-axis direction. The components are linked by O—H...I, C—H...I and C—H...O interactions, generating a three-dimensional network. The O atom deviates from the imidazol ring by 0.896 (2) Å.

2-Hy­droxy­methyl-1,3-dimethyl-1H-benzimidazol-3-ium iodide

In the cation of the title compound, C₁₀H₁₃N₂O⁺·I⁻, all non-H atoms, with the exception of the O atom, are essentially coplanar, with a maximum deviation of 0.04 (1) Å. In the crystal, the cations and anions are arranged in layers parallel to (100). The cations are connected to the anions via an O—H...I hydrogen bond and there are significant π–π stacking inter­actions between cation layers, with centroid–centroid distances in the range 3.606 (5)–3.630 (5) Å. A weak intra­molecular C—H...O hydrogen bond is also observed. The crystal studied was an inversion twin with refined components of 0.52 (5) and 0.48 (5).

8-Hy­droxy­quinolin-1-ium hydrogen sulfate monohydrate

In the crystal structure of the title salt hydrate, C₉H₈NO⁺·HSO₄⁻·H₂O, the quinoline N—H atoms are hydrogen bonded to the bis­ulfate anions. The bis­ulfate anions and water mol­ecules are linked together by O—H...O hydrogen-bonding inter­actions. The cations and anions form separate layers alternating along the c axis, which are linked by N—H...O and O—H...O hydrogen bonds into a two-dimensional network parallel to (100). Further O—H...O contacts connect these layers, forming a three-dimensional network, in which two R₄⁴(12) rings and C₂²(13) infinite chains can be identified.

3-{[(E)-(2-Hydroxynaphthalen-1-yl)methylidene]amino}pyridinium per­chlorate

In the title Schiff base salt, C₁₆H₁₃N₂O⁺·ClO₄⁻, the pyridine ring and the naphthalene ring system are approximately co-planar [making a dihedral angle of 6.05 (12)°] and an intra­molecular O—H...N hydrogen bond occurs between the hydroxyl and imino groups. In the crystal, the cations and anions are linked by N—H...O and weak C—H...O hydrogen bonds, forming the supra­molecular layers parallel to (100). The crystal studied was an inversion twin refined with minor component = 0.43 (13).

2-(4-Chloro­phen­yl)-4-phenyl-1,2-di­hydro­quinazoline

In the title compound, C₂₀H₁₅ClN₂, the pyrimidine ring is in a flattened half-chair conformation. The phenyl and chloro-substituted benzene rings form dihedral angles of 84.97 (5) and 80.23 (4)°, respectively, with the benzene ring of the di­hydro­quinazoline group. The dihedral angle between the phenyl and chloro-substituted benzene rings is 61.71 (5)°. In the crystal, mol­ecules are arranged in inter­secting layers parallel to (101) and (-102), with N—H...N hydrogen bonds linking mol­ecules along [010]. In addition, a weak C—H...π inter­action is observed.

2-(2-Chloro-8-methyl­quinolin-3-yl)-4-phenyl-1,2-di­hydro­quinazoline

In the title compound, C₂₄H₁₈ClN₃, the di­hydro­quinazoline and methyl-substituted quinoline benzene rings make a dihedral angle of 78.18 (4)° and form dihedral angles of 45.91 (5) and 79.80 (4)°, respectively, with the phenyl ring. The dihedral angle between the phenyl ring of di­hydro­quinazoline and the methyl-substituted benzene ring of quinoline is 78.18 (4)°. The crystal packing can be described as crossed layers parallel to the (011) and (0-11) planes. The structure features N—H...N hydrogen bonds and π–π inter­actions [centroid–centroid distance between phenyl rings = 3.7301 (9) Å].