In the title polymeric complex, [Co(C₈H₄NO₂)₂(C₁₀H₈N₂)(H₂O)₂]_n, the Co^II atom, located on an inversion center, is surrounded by two N-donor mol­ecules, two water mol­ecules, and two 4-cyano­benzoate ligands, which impose an octahedral environment on the metal. 4-Cyano­benzoate, acting as a bridging linker, coord­inates to the metal center in a monodentate fashion, in a skew mode. Both bridging spacers, viz. the 4,4'-bi­pyridine and 4-cyano­benzoate ligands, link adjacent metal atoms into a two-dimensional network.

The title compound, [Ag(C₉H₆NO)(C₉H₇NO)], crystallizes as a non-centrosymmetric polymorph. The structure was previously reported by Wu et al. [(2006). Acta Cryst. E62, m281–m282] in the centrosymmetric space group Pbcn. The Ag^I ion displays a distorted tetra­hedral coordination geometry defined by two N and two O atoms from a neutral quinolin-8-ol ligand (HQ) and a deprotonated quinolin-8-olate anion (Q⁻). The dihedral angle between the two ligands is 47.0 (1)°. Strong O—HO hydrogen bonds link the mol­ecules into a supra­molecular chain along the a-axis direction.

The title compound, NH₄⁺·C₅H₃ClNO₃S⁻, was prepared by the hydrolysis of 4-chloro­pyridine-3-sulfonamide. In the crystal structure, a three-dimensional network is formed via N—HO [HO = 1.97 (3)–2.41 (2) Å] and N—HN [HN = 2.13 (3) Å] hydrogen bonds.

In the title compound, [Zn(C₁₂H₈N₂)₂(H₂O)₂](C₂₃H₁₄O₆)·H₂O, the Zn^II ion lies on a twofold axis and exhibits an approximately octa­hedral configuration. The pamoate dianion [or 4,4-methyl­enebis(3-hydr­oxy-2-naphthoate)], also lying on a twofold axis, is uncoordinated and balances the charge. In the crystal structure, O—HO inter­molecular hydrogen bonds link the mononuclear ions into a two-dimensional network.

In the title compound, {[Co(C₈H₄O₄)(C₆H₁₂N₂)(H₂O)₂]·C₃H₇NO}_n, the Co atom is coordinated by the two N atoms from two 1,4-diaza­bicyclo­[2.2.2]octane (dabco) ligands, two O atoms from two isophthalate dianions and two water mol­ecules in a distorted octa­hedral geometry. The dabco mol­ecules function as μ₂-bridging ligands, forming polymeric linear chains running along the c axis. The crystal structure is stabilized by inter­molecular O—HO hydrogen bonds.

In the title compound, [Pb(C₇H₄O₅S)(C₁₂H₈N₂)(H₂O)]_n, each Pb^II atom is coordinated by five O atoms from one water mol­ecule and three 3-sulfonatobenzoate ligands and two N atoms from one 1,10-phenanthroline. The 3-sulfonatobenzoate ligand serves as a μ₃-bridge, linking three Pb^II atoms, and extends the structure into a one-dimensional ladder. The O—HO hydrogen bonds generate a two-dimensional layer and enhance the stability of the structure.

The polymeric title compound, {[Cu(C₈H₃NO₆)(C₁₀H₈N₂)]·H₂O}_n, has two disordered nitro­terephthalate units located around centres of inversion; one functions in a μ₂-bridging mode and the other in a μ₄-bridging mode to surround the five-coordinated Cu atom in a square-pyramidal geometry. The crystal structure reveals a two-dimensional hydrogen-bonded network involving a water mol­ecule of crystallization.

The reaction of copper(II) chloride with 2-bromo-1,4-benzene­di­carboxyl­ic acid (H₂bbdc) and 2,2′-bi­pyridine in aqueous solution under hydro­thermal conditions gave the title compound, [Cu(C₈H₄BrO₄)₂(C₁₀H₈N₂)]. The Cu^II atom lies on a twofold axis and is coordinated by two singly deprotonated 2-bromo-1,4-benzene­di­carboxyl­ate groups and one 2,2′-bi­pyridine ligand in a square-planar geometry. Intermolecular O—HO hydrogen bonds between carboxyl­ate groups ensure a two-dimensional architecture with double sheets.

The crystal structure of the title compound, poly[deca-μ-aqua-octa­aqua-μ-deca­vanadato-dilithium(I)tetra­sodium(I)] [Li₂Na₄(H₂O)₁₈{V₁₀O₂₈}]_n, consists of polymeric chains composed of centrosymmetric [V₁₀O₂₈]⁶⁻ polyanions with C_i symmetry linked by [LiNa₂(H₂O)₉]³⁺ cation groups via O-polyanion—Na-group—O-polyanion coordination, with Na—O bond lengths of 2.366 (2)–2.495 (2) Å. The lithium disodium nona­hydrate is composed of two NaO₆ octa­hedra and one LiO₄ tetra­hedron. Hydrogen bonds occur between the polyanion and the cation group, and within the cation group. Intra­chain OW—HO hydrogen bonds stabilize the polymeric chain structure, while inter­chain OW—HO hydrogen bonds link neighbouring polymeric chains to form the complete supramolecular structure.

The title compound, C₁₂H₁₀N₂·C₁₄H₁₀O₅, is a cocrystal of (E)-4,4′-diaza­stilbene and 4,4′-oxydibenzoic acid, lying on an inversion centre and a twofold axis, respectively. Mol­ecules are linked by strong inter­molecular O—HN hydrogen bonds, resulting in a one-dimensional architecture.

The title compound, C₅H₄ClNO₃S, was obtained by hydrolysis of 4-chloro­pyridine-3-sulfonamide in dilute hydrochloric acid. In the crystal structure, one-dimensional chains are formed via N—HO hydrogen bonds. In addition, weak C—HCl hydrogen bonds link these chains into a two-dimensional network

The crystal structure of the title compound, C₄H₆O₆·H₂O, displays a two-dimensional network formed by O—HO hydrogen bonds.

The title complex, C₈H₆O₃·C₄H₈NO₂·0.5H₂O, was obtained from an aqueous solution of racemic 2-amino­butyric acid and (S)-2-hydroxy­phenyl­acetic acid. In the crystal structure, a two-dimensional network is formed via O—HO [HO = 1.63 (5)–2.52 (5) Å] and N—HO [HO = 1.91 (4)–2.30 (4) Å] hydrogen bonds.

The crystal structure of the title compound, (NH₄)₂[Ni(H₂O)₆]₂V₁₀O₂₈·4H₂O, comprises centrosymmetric [V₁₀O₂₈]^6- anions that are linked via hydrogen bonding by two NH₄⁺ cations, two [Ni(H₂O)₆]²⁺ cations, and four water mol­ecules into a three-dimensional structure. The compound is isotypic with other members of the [M(H₂O)₆]₂(NH₄)₂V₁₀O₂₈·4H₂O series (M = Mg and Co).

The title compound, C₁₃H₈Cl₃N₃O, shows the substituted pyridine ring to be twisted by about 10° from the rest of the essentially planar mol­ecule.

The title compound, C₂₃H₂₅N₃, is an important pyrrolotriazole compound. The two phenyl rings are nearly perpendicular, with a dihedral angle between them of 85.88 (8)°. The five-membered pyrrolidine ring adopts an envelope conformation.

The title compound, C₂₂H₂₂O₃, was synthesized by a reaction of ethyl acetoacetate and diphenyl­methyl­enecyclo­propane. The five-membered dihydro­furan ring adopts an envelope conformation.