Poly[piperazine-1,4-diium [μ₄-chlorido-μ₃-chlorido-tri-μ₂-chlorido-chloridodicadmate(II)] monohydrate]

In the title compound, {(C₅H₁₄N₂)[Cd₂Cl₆]·H₂O}_n, the asymmetric unit contains one piperazinediium cation, one [Cd₂Cl₆]²⁻ anion and a water mol­ecule. The coordination geometries of the two Cd²⁺ cations are distorted octa­hedral. Adjacent Cd^II atoms are inter­connected alternately by paired chloride bridges, generating polymeric chains parallel to [010]. Neighbouring chains are connected by O—H...Cl hydrogen bonds involving the water mol­ecules, forming layers at z = n/2. The crystal packing is further stabilized by inter­molecular N—H...Cl and N—H...O hydrogen bonds, one of which is bifurcated.

4-Acetamido­anilinium nitrate monohydrate

In the title hydrated salt, C₈H₁₁N₂O⁺·NO₃⁻·H₂O, the N—C bond distances [1.349 (2) and 1.413 (2) Å] along with the sum of the angles (359.88°) around the acetamide N atom clearly indicate that the heteroatom has an sp² character. The ammonium group is involved in a total of three N—H...O hydrogen bonds, two of these are with a water mol­ecule, which forms two O—H...O hydrogen bonds. All these hydrogen bonds link the ionic units and the water mol­ecule into infinite planar layers parallel to (100). The remaining two N—H...O inter­actions in which the ammoniun group is involved link these layers into an infinite three-dimensional network.

Bis(adamantan-1-aminium) hydrogen phosphate fumaric acid sesquisolvate

The asymmetric unit of the title compound, 2C₁₀H₁₈N⁺·HPO₄²⁻·1.5C₄H₄O₄, contains two adamantan-1-aminium cations, one hydrogen phosphate anion, and one and a half mol­ecules of fumaric acid, one of which exhibits crystallographic inversion symmetry. Each HPO₄²⁻ anion is hydrogen bonded, via all of its O atoms, to four NH₃⁺ groups of the adamantan-1-aminium cations, forming chains along [100]. These chains are, in turn, inter­connected via a set of O—H...O hydrogen bonds involving the fumaric acid solvent mol­ecules, forming layers parallel to (001). Weak C—H...O inter­actions lead to a consolidation of the three-dimensional set-up.

1-(2-Ammonio­eth­yl)piperazin-1,4-diium dihydrogeno­phosphate monohydrogeno­phosphate

The structure of the title compound, C₆H₁₈N₃·HPO₄·H₂PO₄, is characterized by two kinds of inorganic chains running along the a-axis direction. The first one is composed of HPO₄²⁻ anions, while the second one is built up by H₂PO₄⁻ anions. Both types of chains are held together by O—H...O hydrogen bonds. The organic cations are attached to these chains through N—H...O and C—H...O hydrogen bonds. The piperazin-1,4-diium ring adopts a chair conformation.

Tris(5-amino-1H-1,2,4-triazol-4-ium) dihydrogenphosphate hydrogen­phosphate trihydrate

In the crystal structure of the title molecular salt, 3C₂H₅N₄⁺·HPO₄²⁻·H₂PO₄⁻·3H₂O, the phosphate-based framework is built upon layers parallel to (010) made up from the H₂PO₄⁻ and HPO₄²⁻ anions and water mol­ecules, which are inter­connected through O—H...O hydrogen bonds. The organic cations are located between the phosphate–water layers and are connected to them via N—H...O hydrogen bonds. The bond-length features are consistent with an imino resonance form for the exocyclic amino group, as is commonly found for a C—N single bond involving sp²-hybridized C and N atoms.