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The asymmetric unit of the title Pb-based coordination polymer, [Pb2(C24H16N2O8)(H2O)2]n, consists of one PbII cation, half of a 4,4′-(1,4-phenylene)bis(2,6-dimethylpyridine-3,5-dicarboxylate (L4−) ligand and one coordinating water molecule. The centers of the benzene ring of the ligand and the four-membered Pb/O/Pb/O ring are located on centers of inversion. The PbII ion is coordinated in form of a distorted polyhedron by seven O atoms from four separate L4− ligands and by one water O atom. The PbO7 polyhedra share O atoms, forming infinite zigzag [PbO4(H2O)]n chains along [100] that are bridged by L4− ligands, forming a two-dimensional coordination network parallel to (001). O—H...O hydrogen bonds involving the water molecule are observed.

In the title complex, [V(C15H12N2O4)(C2H5O)O], the VV ion is coordinated by an oxide O atom, an ethanolate anion and two O atoms and one N atom from the tridentate benzohydrazidate dianion in a distorted square-pyramidal geometry; the V atom is displaced by 0.4748 (8) Å from the basal plane towards the axial oxide O atom. An intramolecular O—H...N hydrogen bond occurs in the benzohydrazidate ligand. Weak intermolecular C—H...O hydrogen bonding is present in the crystal.

The title compound, [Mn(C6H4N5)2(H2O)4]·4H2O, was obtained by the solution reaction of MnCl2 and 3-(2H-tetrazol-5-yl)pyridine. The MnII atom, located on an inversion center, shows a slightly distorted octahedral geometry and is coordinated by two pyridine N atoms from two 5-(pyridin-3-yl)tetrazolide ligands occupying trans positions and four water molecules. In the crystal, the mononuclear complex molecules and solvent water molecules are connected into a three-dimensional framework by O—H...N and O—H...O hydrogen bonds.

In the title compound, [Cd2(C7H3NO4)2(C13H8N4)2(H2O)2], the CdII ion is six-coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (IP) ligand, one N atom and one O atom from a pyridine-2,3-dicarboxylate (pdc) ligand, one O atom from another pdc ligand and one water molecule in a distorted octahedral geometry. Two CdII ions are bridged by a pair of pdc ligands, forming a centrosymmetric dinuclear structure. Neighboring dinuclear units are linked by the coordinated water molecules through O—H...N and O—H...O hydrogen bonds, forming a layer parallel to (011). The layers are further linked into a three-dimensional network through N—H...O hydrogen bonds. π–π interactions between the IP ligands further stabilize the supramolecular structure [centroid–centroid distances = 3.579 (3), 3.686 (3), 3.710 (3), 3.766 (3) and 3.841 (3) Å].

In the title compound, [HgCl2(C18H16N2O2)]n, the HgII atom is four-coordinated in a distorted tetrahedral environment defined by two Cl atoms and two N atoms from two 1,4-bis(pyridin-2-ylmethoxy)benzene ligands. The ligand shows a non-coplanar conformation, in which the dihedral angles between the two terminal pyridine rings and the linking benzene ring are 7.275 (17) and 74.020 (14)°. The flexible ligands link the HgII atoms into a chain running along [010], with an Hg...Hg separation of 10.335 (5) Å, which is equal to the b axis. The chains are connected by C—H...O and C—H...Cl hydrogen bonds.

The asymmetric unit of the title trinuclear NiII compound, [Ni3(C11H11N2O3)(C5H5N)4], contains two independent molecules which are located on individual inversion centres. The central Ni atom, located on an inversion centre, is coordinated by two pyridine N atoms and is further N,O-chelated by two N-(2-methylpropanoyl)salicyloylhydrazidate anions in an elongated octahedral coordination geometry. The terminal Ni atom is coordinated by a pyridine ligand and is further N,N′,O-chelated by an N-(2-methylpropanoyl)salicyloylhydrazidate anion in a distorted square-planar coordination geometry. Weak intramolecular C—H...O hydrogen bonding is observed in the structure.

The structure of the title compound, [Cu(C8H7O2)2(C3H4N2)2(C8H8O2)2], consists of centrosymmetric monomeric units, in which the CuII atom has a tetragonally distorted octahedral coordination involving two imidazole N atoms and two carboxylate O atoms in the square plane [Cu—N = 1.964 (3) and Cu—O = 1.960 (2) Å] and 2-methylbenzoic acid O atoms in axial sites [Cu—O = 2.753 (3) Å]. Within the complex, the carboxylic acid forms intramolecular O—H...O hydrogen bonds, while the molecules are assembled through N—H...O(carboxyl) hydrogen bonds into chains extending along the a-axis direction. These chains are further linked by weak π–π interactions [centroid–centroid separation = 3.930 (2) Å].

In the polymeric title complex, [Zn(C9H7NO4)]n, the ZnII cation is located on a twofold rotation axis and is coordinated by five 2,6-dimethylpyridine-3,5-dicarboxylate (mpdc) anions in a distorted ZnNO4 trigonal–bipyramidal geometry. The mpdc anion is also located on the twofold rotation axis and bridges five ZnII cations, forming the three-dimensional polymeric complex. Weak C—H...π interactions are present in the crystal structure.

The solvothermal reaction of Co(NO3)2 and 2,4,6-tris(4-pyridyl)-1,3,5-triazine in dimethylformamide/ethanol mixed solvent afforded the title coordination polymer, [Co(NO3)2(C18H12N6)]n, in which the CoII atom is seven-coordinated by pyridyl groups of three different ligands and two chelating nitrate anions. The complex displays a nano-sized porous metal–organic framework that belongs to a (10,3) topological network.

The asymmetric unit of the title compound, C20H14N4·CH4O, contains two independent half-molecules, each located on an inversion centre, and a methanol solvent molecule. The benzimidazolyl groups form different dihedral angles [24.0 (1) and 11.6 (1)°] with the plane of the central benzene ring in the two molecules. In the crystal, a two-dimensional network is formed through N—H... N, N—H...O and O—H...N hydrogen-bonding interactions between the benzimidazole units and methanol solvent molecules. π–π stacking interactions also occur between the benzimidazole rings of adjacent molecules, with centroid–centroid distances of 3.720 (14) Å and interplanar distances of 3.53 (1) Å .

In the title centrosymmetric dinuclear compound, [Mn2(SO4)2(C13H8N4)2(H2O)4]·2H2O, the MnII atom is octahedrally coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (ip) ligand, two O atoms belonging to two bridging sulfate anions and two water O atoms. In the crystal structure, the complex molecules and the uncoodinated water molecules are connected by O—H...O, O—H...N and N—H...O hydrogen bonds into a three-dimensional network. A π–π stacking interaction between the pyridyl ring of the ip ligand and the benzene ring of the neighboring ligand [centroid–centroid distance = 3.579 (2) Å] is also observed.

The title dinuclear FeII complex, [Fe2(SO4)2(C13H8N4)2(H2O)4]·2H2O, is centrosymmetric. Two sulfate anions bridge two FeII cations to form the binuclear complex. Each FeII cation is coordinated by two N atoms from a 1H-imidazo[4,5-f][1,10]phenanthroline (IP) ligand, two O atoms from two sulfate anions and two water molecules in a distorted octahedral geometry. Extensive O—H...O, N—H...O and O—H...N hydrogen bonding is present in the crystal structure. Weak π–π stacking is observed between parallel IP ring systems, the face-to-face separation being 3.428 (14) Å.

In the title complex, [Mn(C8H4O7S)(C12H8N2)2], the MnII atom is chelated by one 4-carboxy-2-sulfonatobenzoate anion and two phenathroline (phen) ligands in a distorted octahedral MnN4O2 geometry. The benzene ring of the 4-carboxy-2-sulfonatobenzoate anion is twisted with respect to the two phen ring systems at dihedral angles of 66.38 (9) and 53.56 (9)°. In the crystal, intermolecular O—H...O and C—H...O hydrogen bonding links the molecules into chains running parallel to [100]. Intermolecular π–π stacking is also observed between parallel phen ring systems, the face-to-face distance being 3.432 (6) Å.

The hydrothermal reaction of butane-1,2,3,4-tetracarboxylic acid (H4butca), 4,4′-bipyridine (bipy) and Mn(SO4)2·H2O afforded a new co-crystal, C8H10O8·2C10H8N2 or H4butca·2(bipy), in which strong O—H...N hydrogen-bonding and weak π–π stacking [centroid–centroid distance = 3.8459 (19) Å] interactions assemble the organic molecules into a three-dimensional supramolecular framework. C—H...O interactions are also present. The whole molecule has inversion symmetry.

In the title compound, [Zn(C8H4O7S)(C12H9N3)2]·H2O, the ZnII atom has a distorted octahedral coordination geometry, defined by four N atoms from two 2-(2-pyridyl)-1H-benzimidazole ligands and two O atoms from a deprotonated carboxylate group of the 3-carboxy-5-sulfonatobenzoate ligand. In the crystal structure, the complex molecules are linked into a three-dimensional network by intermolecular O—H...O and N—H...O hydrogen bonds, and π–π stacking interactions with centroid–centroid separations of 3.758 (2) and 3.597 (1) Å.

In the title compound, [Zn(C10H11N2O2)2(C5H5N)2], the ZnII atom lies on an inversion centre, and is coordinated in a distorted octahedral geometry by two carbonyl O atoms and two imino N atoms from two anionic bidentate acetone (2-hydroxybenzoyl)hydrazone ligands and by two N atoms from two pyridine molecules. The hydroxyl group acts as a donor, forming an intramolecular O—H...N hydrogen bond.

The title compound, [ZnCl2(C12H8N4S)]n, was obtained by crystallization of 2,5-di-4-pyridyl-1,3,4-thiadiazole with ZnCl2 in an MeOH/CHCl3 solvent system. The structure contains infinite chains of ZnCl2 units connected by the bifunctional thiadiazole ligands, with ZnII adopting a distorted tetrahedral coordination geometry. The dihedral angle between the two pyridyl rings in each ligand is 34.3 (1)°, and the dihedral angles between the thiadiazole ring and the two pyridyl rings are 18.3 (2) and 16.1 (2)°. The shortest Zn...Zn distance within each polymeric chain is 11.862 (3) Å, while the shortest interchain Zn...Zn distance is 7.057 (3) Å.

Crystals of the title organic compound, C8H6N8, were generated in situ through the [2 + 3]-cycloaddition reaction involving the precursor 1,4-dicyanobenzene and azide in water with Zn2+ as Lewis acid. The asymmetric unit consists of one half-molecule, and a twofold axis of symmetry passes through the centre of the benzene ring. There is an intermolecular N—H...N hydrogen bond. The molecules are assembled into a three-dimensional supramolecular framework by π–π stacking interactions, with a perpendicular distance of 3.256 Å [centroid–centroid = 3.9731 (8) Å] between two tetrazole ring planes, and 3.382 Å between the benzene ring and tetrazole ring planes [centroid–centroid = 3.5010 (9) Å].

Hydrothermal reaction of NaSCN, piperazine, ZnII and 2,6-naphthalenedicarboxylic acid in aqueous solutions gave rise to the title complex, [Zn(NCS)3(C4H11N2)]. The ZnII atom is four-coordinate with distorted tetrahedral geometry and lies in a mirror plane. N—H...S hydrogen bonds assemble the molecules to form a three-dimensional framework.