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In the crystal structure of the title compound, C9H12N2O3, weak intermolecular C—H...O hydrogen bonds link the molecules into chains. Further weak C—H...O hydrogen bonds together with π–π interactions [centroid–centroid distance = 3.672 (4) Å] between neighbouring chains lead to a double-chain structure propagating in [100].

The title compound, [Cu3(C5HN2O4)2(C12H8N2)2(H2O)4]·2H2O, is a trinuclear copper(II) complex in which two centrosymmetrically related pyrazole-3,5-dicarboxylate(3−) and 1,10-phenanthroline ligands bind three CuII atoms, with one CuII atom located on a center of symmetry. In each complex, there are four coordinated water molecules and two solvent water molecules, which participate in extensive hydrogen-bond patterns. These interactions, as well as π–π interactions between neighbouring 1,10-phenanthroline ligands [shortest atom-to-atom distance = 3.363 (3) Å], extend the crystal structure into a three-dimensional supramolecular network.

In the trinucler CuII complex molecule of the title compound, [Cu3(C5HN2O4)2(H2O)8]·4H2O, the central CuII atom is located on an inversion centre and is coordinated in a distorted octahedral geometry. The equatorial sites are occupied by two N and two O atoms from two pyrazole-3,5-dicarboxylate ligands and the axial positions are occupied by two water molecules. The two other symmetry-related CuII atoms are pentacoordinated and assume a square-pyramidal geometry. In the crystal structure, coordinated and uncoordinated water molecules and carboxylate O atoms are linked by O—H...O hydrogen bonds.

The title mixed-metal complex, {(NH4)2[Cu(C7H3NO4)2(H2O)2][CdCu(C7H3NO4)2(H2O)6]·6H2O}n, contains one octahedrally coordinated CdII center and two octahedrally coordinated CuII centers, each lying on an inversion center. The two CuII atoms are each coordinated by two O atoms and two N atoms from two 2,4-pydc (2,4-H2pydc = pyridine-2,4-dicarboxylic acid) ligands in the equatorial plane and two water molecules at the axial sites, thus producing two crystallographically independent [Cu(2,4-pydc)2(H2O)2]2− metalloligands. One metalloligand exists as a discrete anion and the other connects the Cd(H2O)4 units, forming a neutral chain. O—H...O and N—H...O hydrogen bonds connects the polymeric chains, complex anions, ammonium cations and uncoordinated water molecules into a three-dimensional supramolecular network.

In the title compound, {[Zn(C10H8N2)(H2O)4](C8H4O4)}n, the ZnII atoms, lying on a twofold rotation axis, are bridged by 4,4′-bipyridine ligands, resulting in a linear chain along the b axis. In the chain, the ZnII atom adopts a slightly distorted octahedral coordination geometry involving four water molecules at the equatorial positions. The noncoordinated benzene-1,4-dicarboxylate anion, which is also located on a twofold rotation axis, bridges adjacent chains through O—H...O hydrogen bonds, forming a three-dimensional supramolecular network.

The title compound, C13H11ClF3NO2, adopts a Z conformation. Halogen...oxygen interactions [Cl...O = 2.967 (3) Å] in the crystal packing lead to the formation of a dimer joined by two Cl...O bonds.

In the cation of the title compound, (C15H20N2)[CdBr4], the dihedral angle between the two pyridine rings is 70.85 (5)°. An intermolecular π–π interaction between the pyridine rings [centroid–centroid distance = 3.900 (4) Å] is observed. The CdII atom has a distorted tetrahedral coordination.

The title compound, C12H11N4OS2, has been synthesized by the condensation reaction of 3-oxo-2-(phenylhydrazono)butanate and S-methyldithiocarbazate. The hydrazine unit and the pyrazole ring are coplanar [dihedral angle 3.8 (4)°] due to extensive conjugation and the N—H...O=C intramolecular hydrogen bond. Two adjacent molecules form dimers due to short C—H...O=C [R22 (18)] and C—H...S=C [R22 (22)] intermolecular interactions. C—H...S—C [R22 (14)] interactions link these dimers into ribbons in the [011] direction.

In the title compound, C12H14N22+·2BF4−, the cation has a centre of symmetry at the mid-point of the central C—C bond. π–π interactions, with a shortest atom-to-atom distance of 3.757 (4) Å, extend the crystal structure into a one-dimensional supramolecular chain.