The title compound, C₁₀H₂₄N₂O₂, was synthesized by N-alkyl­ation of 1,2-dichloro­ethane with racemic 2-amino-1-butanol. The mol­ecule lies on a crystallographic inversion center and the crystal structure is stabilized by inter­molecular O—HN and N—HO hydrogen bonds.

The asymmetric unit of the title compound, C₁₀H₂₆N₂O₂²⁺·2NO₃⁻, comprises one half of an N-diprotonated (R,S)-ethambutol cation, which lies about a centre of symmetry, and a nitrate anion. In the crystal structure, a two-dimensional network is formed via inter­molecular O—HO and N—HO hydrogen bonds.

The title compound, C₁₀H₂₈N₂O₁₀S₂, was synthesized by the reaction of concentrated sulfuric acid with (R,S)-ethambutol. The zwitterionic amino–sulfate system, protonated at both N atoms, lies about a centre of symmetry. The asymmetric unit also contains a solvent water mol­ecule. In the crystal structure, inter­molecular O—HN and N—HO hydrogen bonds link the mol­ecules into a three-dimensional network.

The title compound, C₁₀H₂₄N₂O₂, was synthesized by N-alkyl­ation of 1,2-dichloro­ethane with (S)-2-amino-1-butanol. In the crystal structure, O—HN and N—HO link the mol­ecules into sheets in the bc plane.

In the title compound, C₂₄H₁₆N₂O₆, the dihedral angles between the central 4,5-dicyano-1,2-phenyl­ene unit [maximum deviation from planarity = 0.014 (4) Å] and the pendant benzene rings are 73.62 (5) and 84.08 (6)°.

In the crystal structure of the title compound, C₁₅H₁₄N₂O₃, mol­ecules are connected via weak inter­molecular O—HO and C—HO hydrogen-bonding inter­actions, forming a zigzag form.

Molecules of the title compound, C₂₀H₁₆N₆.4H₂O, lie across crystallographic inversion centres. The dihedral angle between each benzotriazole moiety and the central benzene ring is 74.95 (9)°. In the crystal structure, the molecular organization is stabilized by well defined weak C—Hπ, π–π, O—HO and O—HN intermolecular interactions, leading to the formation of a two-dimensional network.

The self-assembly of tetra­thio­molybdate, silver iodide and cerium nitrate in N,N-dimethyl­acetamide (dmac) and methanol resulted in a one-dimensional anionic Mo/S/Ag polymer, catena-poly[hepta­kis(N,N-dimethyl­acetamide-κO)(methanol-κO)cerium(III) [di-μ₃-sulfido-octa-μ₂-sulfido-disulfido­trisilver(I)trimolybdenum(VI)]], {[Ce(C₄H₉NO)₇(CH₄O)][Mo₃S₁₂Ag₃]}_n. The polymeric anion {[Mo₃S₁₂Ag₃]_n}³ⁿ⁻ assumes a new configuration of a saw-tooth chain with the lengths of the sides in a 1:2 ratio. Such a configuration is inter­mediate between the polymeric anions in two reported compounds, viz. {[Ca(DMF)₆][Mo₂S₈Ag₂]}_n and {[Ca(DMSO)₆]₂[W₄S₁₆Ag₄]}_n (DMF is dimethyl­formamide and DMSO is dimethyl sulfoxide). The metal atoms in the chain are nearly coplanar. The central Ce in the solvent-coordinated cation has distorted square-anti­prismatic coordination. Of the seven N,N-dimethyl­acetamide (dmac) mol­ecules present, one is found to be disordered over two sites, with occupancy factors of 0.63 and 0.37. The overall structure can be viewed as consisting of staggered layers parallel to (010), which are formed by anionic chains propagating along the a axis and cations distributed in the spaces between the anionic chains. No notable inter­actions are found between cations and polymeric anions except for electrostatic attractions.

The self-assembly of tetra­thio­tungstate(VI), silver sulfide and ytterbium(III) nitrate in hexa­methyl­phospho­ramide (hmp) resulted in a one-dimensional anionic W/S/Ag polymer, {[Yb(NO₃)₂(C₆H₁₈N₃OP)₄][WAgS₄]}_n. The central Yb coordination polyhedron in the cationic complex [Yb(hmp)₄(NO₃)₂]⁺ is a distorted square anti­prism. The [YbO₈] assembly has an approximate fourfold inversion axis along the bis­ector of one of the chelating nitrate groups. The polymeric anion {[WS₄Ag]⁻}_n presents a distorted linear configuration, with W—Ag—W and Ag—W—Ag angles of 160.81 (7) and 153.41 (7)°, deviating significantly from the ideal 180°. The anionic chains in the title compound are similar to those in {N(C₆H₅CH₂)(C₂H₅)₃[MoS₄Ag]}_n: they both have a similar wave-like appearance but have different orientations. The former propagate along the c axis, while the latter have two orientations: one parallel to the a axis and the other parallel to the b axis.

The title compound, {[Cd(C₁₉H₁₃N₄O₄)₂(H₂O)₂]·4H₂O}_n or {[Cd(BBA)₂(H₂O)₂]·4H₂O}_n, where BBA is 3,5-bis­(iso­nicotin­amido)­benzoate, is isotypic with its Mn isologue [Chen et al. (2009). J. Coord. Chem. 62, 2421–2428]. The cation sits on a twofold axis and is six-coordinated in a slightly distorted octa­hedral geometry; the polyhedra are linked into zigzag chains, which are further connected by N—HO, O—HO and O—HN hydrogen bonds as well as π–π inter­actions [centroid-centroid distance of 3.639 (2) Å], giving a three-dimensional supra­molecular framework.

The title compound, [Cd(C₉H₉O₂)₂(C₁₂H₈N₂)]_n, was synthesized in a water–methanol solution and its crystal structure was determined by X-ray diffraction analysis. The Cd atoms are octa­hedrally coordinated by two N atoms from phenanthroline and four O atoms from four different 3,5-dimethyl­benzoate ions, completing the octa­hedral geometry. The O atoms of the carboxylate group coordinate to Cd^II in a bidentate bridging manner. The complex shows a one-dimensional chain structure of Cd atoms bridged by 3,5-dimethyl­benzoate anions.

In the crystal structure of the title compound, [Cd(C₅H₃O₃)₂(C₁₀H₈N₂)]_n, which was synthesized from the reaction of Cd(ClO₄)₂·6H₂O, furan-2-carboxylic acid and 4,4′-bipyridine in methanol–water, the Cd atom is octa­hedrally coordinated by two N atoms of two bipyridine ligands and four O atoms of four furan-2-carboxyl­ate ligands. The carboxyl­ate group coordinates in a bridging mode; the Cd atom and 4,4′-bipyridine ligand lie on a crystallographic twofold rotation axis. The compound exhibits a layer structure arising from the bonding modes of the furan-2-carboxyl­ate anion and the 4,4′-bipyridine heterocycle.

The title compound, C₂₄H₃₀O₇, displays a trans configuration with respect to the C=C bond. The cyclo­hexenone ring has an envelope conformation; the flap atom (with the isopropoxycarbonyl groups) is displaced by 0.664 (3) Å from the plane of the other five ring atoms and the carbonyl O atom. The dihedral angle between the cyclo­hexenone ring and the benzene ring is 7.85 (9)°. The meta and para meth­oxy O atoms are displaced by 0.003 (7) and 0.031 (4) Å, respectively, from the benzene ring to which they are attached.

In the title natural product, C₁₇H₂₄O₄, which is a very potent inhibitor of protein synthesis in mammalian cells, the five-membered ring displays an envelope conformation, whereas the two six-membered rings show different conformations, viz. chair and half-chair.

The title compound, C₁₆H₁₆O₈, is a potent nonspecific phyto­toxin. The crystal structure is the average of two tauto­mers, 5,6,7,9,10-penta­hydr­oxy-2-meth­oxy-7-methyl-1,4,5,6,7,8-hexa­hydro­anthracene-1,4-dione and 1,4,5,6,7-pentahydr­oxy-2-meth­­oxy-7-methyl-5,6,7,8,9,10-hexa­hydro­anthracene-9,10-di­one. The cyclo­hexene rings in both tautomers display a half-chair conformation. An extensive O—HO hydrogen-bonding network is present in the crystal structure.