Diaqua­bis(biuretato-κ²O,O′)nickel(II) dichloride

The title compound, [Ni(C₂H₅N₃O₂)₂(H₂O)₂]Cl₂, contains Ni²⁺ cations octa­hedrally coordinated by two bidentate biuret mol­ecules in an O,O′-bidentate coordination mode and two water mol­ecules, the latter in a trans configuration. Two chloride anions provide charge compensation. Numerous N—H...O (mean H...O = 2.17 Å, mean N—H...O = 164° and mean N...O = 2.991 Å), N—H...Cl (mean H...Cl = 2.46 Å, mean N—H...Cl = 162° and mean N...Cl = 3.278 Å) and O—H...Cl (mean H...Cl = 2.19 Å, mean O—H...Cl = 159° and mean O...Cl = 3.068 Å) hydrogen bonds help to stabilize the crystal packing.

Bis(cyclo­heptyl­aminium) hydrogenarsenate monohydrate

The title compound, 2C₇H₁₆N⁺·HAsO₄²⁻·H₂O, contains a network of cyclo­heptyl­aminium cations, hydrogenarsenate anions and water mol­ecules. The crystal packing involves N—H...O [average H...O = 1.86 Å, N—H...O = 172° and N...O = 2.756 (2) Å] and O—H...O [average H...O = 1.91 Å, O—H...O = 168° and O...O = 2.756 (2) Å] hydrogen bonds, resulting in a layered structure.

Creatininium dihydrogenarsenate

The title compound, (C₄H₈N₃O)[H₂AsO₄], contains a network of creatininium cations and dihydrogenarsenate anions [mean As—O = 1.681 (2) Å]. The crystal packing involves anion-to-anion O—H...O, cation-to-anion N—H...O and cation-to-cation N—H...O hydrogen bonds, resulting in a chain structure.

Propane-1,3-diaminium bis­(dihydrogenarsenate)

The title compound, (C₃H₁₂N₂)[H₂AsO₄]₂, contains a network of propane-1,3-diaminium cations and dihydrogenarsenate anions [mean As—O = 1.682 (2) Å]. The crystal packing involves anion-to-anion O—H...O hydrogen bonds, resulting in double chains of dihydrogenarsenate tetra­hedra. Cation-to-anion N—H...O hydrogen bonds generate a three-dimensional overall structure. One C atom occupies a special position with twofold symmetry.

Propane-1,3-diaminium hydrogenarsenate monohydrate

The title compound, (C₃H₁₂N₂)[HAsO₄]·H₂O, contains a network of propane-1,3-diaminium cations, hydrogenarsenate anions [mean As—O = 1.687 (2) Å] and water mol­ecules. The crystal packing involves anion-to-anion and water-to-anion O—H...O hydrogen bonds, resulting in infinite chains containing the unusual R₃³(10) graph-set motif. Cation-to-anion and cation-to-water N—H...O hydrogen bonds generate a three-dimensional overall structure.

Propane-1,2-diaminium selenite monohydrate

The title compound, C₃H₁₂N₂²⁺·SeO₃²⁻·H₂O, contains a network of propane-1,2-diaminium (C₃H₁₂N₂²⁺) cations, selenite (SeO₃²⁻) anions and water mol­ecules. The crystal packing involves N—H...O [average H...O = 1.89 Å, N—H...O = 165° and N...O = 2.777 (3) Å] and O—H...O hydrogen bonds, resulting in a layered structure.

Eth­yl (E)-4-(2-formyl­phen­oxy)but-2-enoate

The mol­ecule of the title compound, C₁₃H₁₄O₄, possesses normal geometric parameters. Its approximately planar conformation could be influenced by two intra­molecular C—H...O inter­actions.

Ethyl­enediaminium tetra­chloro­zincate

The title compound, (C₂H₁₀N₂)[ZnCl₄], contains a network of ethyl­enediaminium cations and tetra­hedral tetra­chloro­zincate anions. A three-dimensional network of N—H...Cl hydrogen bonds, some of which are bifurcated, helps to establish the crystal packing.

A monoclinic polymorph of dichloro­bis(cyano­guanidine)zinc(II)

The mol­ecular title compound, β-[ZnCl₂(C₂H₄N₄)₂], crytallizes as a monoclinic polymorph of the known triclinic structure of this material. A complex network of N—H...N and N—H...Cl hydrogen bonds help to establish the crystal packing.

Guanidinium dihydrogenarsenate

The title compound, (CH₆N₃)[H₂AsO₄], contains a network of guanidinium cations and dihydrogenarsenate anions. The component species inter­act by way of cation-to-anion N—H...O and anion-to-anion O—H...O hydrogen bonds, the latter leading to infinite sheets of [H₂AsO₄]⁻ anions.

Propane-1,2-diaminium hydrogenarsenate

The title compound, (C₃H₁₂N₂)[AsHO₄], is a mol­ecular salt containing a network of propane-1,2-diaminium cations and hydrogenarsenate anions [mean As—O 1.686 (2) Å]. The crystal packing involves cation-to-anion N—H...O and anion-to-anion O—H...O hydrogen bonds, the latter resulting in dimeric associations of two adjacent hydrogenarsenate anions.

Bis[1-(2,6-dimethyl­anilino)propane-1,2-dione dioximato]nickel(II)

The structure of the title complex consists of isolated [Ni(C₁₁H₁₄N₃O₂)₂] units. The Ni atom is coordinated by four oxime N atoms in distorted square-planar geometry and lies on an inversion centre. The structure is stabilized by strong intra­molecular N—H...O and O—H...O hydrogen bonds and a possible N—H...π inter­molecular inter­action.

{N-[(S)-1-Phenyl­ethyl]carbamo­yl}methyl­aminium chloride

In the title compound, C₁₀H₁₅N₂O⁺·Cl⁻, the crystal packing is influenced by N—H...O and N—H...Cl hydrogen bonds, resulting in a layered structure.

N-(2-Bromo­phen­yl)acetamide

The title compound, C₈H₈BrNO, posseses normal geometrical parameters. The crystal packing is influenced by an inter­molecular N—H...O hydrogen bond.

N-(2-Bromo­phen­yl)propionamide

The title compound, C₉H₁₀BrNO, posseses normal geom­etrical parameters. The crystal packing is influenced by an N—H...O hydrogen bond.

1-(2-Bromo-5-methoxy­phen­yl)-8-chloro-6-(2-fluoro­phen­yl)-4H-1,2,4-triazolo[4,3-a][1,4]benzodiazepine

The title compound, C₂₃H₁₅BrClFN₄O, is an analogue of sedatives such as midazolam and alprazolam. Its geometrical parameters are normal and comparable with those of related compounds. The only possible significant inter­molecular inter­action is a C—H...O bond.

3-Chloro-4-hydr­oxy-4′-methyl­benzophenone

The title compound, C₁₄H₁₁ClO₂, possesses normal geometrical parameters. The two benzene rings are twisted by 54.70 (4)°, perhaps as a result of steric repulsion between H atoms. The crystal packing is consolidated by an O—H...O hydrogen bond, π–π stacking and C—H...O and C—H...π inter­actions, resulting in a two-dimensional network.