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In the title complex, {[Zn(C7H3NO4)(C12H8N2)]·H2O}n, the ZnII ion is in a distorted octa­hedral environment, defined by two N atoms from a chelating 1,10-phenanthroline (phen) ligand and one N atom and three O atoms from two pyridine-2,3-dicarboxyl­ate (2,3-pydc) ligands. The bridging 2,3-pydc ligands connect the ZnII ions into a chain extending along [010]. O—H⋯O hydrogen bonds between the uncoordinated water mol­ecules and the uncoordinated carboxyl­ate O atoms, as well as π–π inter­actions between the pyridine rings of the phen ligands [centroid–centroid distance = 3.557 (2) Å], are observed.

In the title compound, {[Mn(C8H4O4)(C10H8N2)(H2O)]·H2O}n, the MnII centre is octa­hedrally coordinated by three O atoms from two 5-methoxy­isophthalate (CH3O-ip) ligands, a fourth from a coordinated water mol­ecule and two N atoms from one chelating 2,2′-bipyridine (2,2-bipy) ligand. Each pair of adjacent MnII atoms is bridged by a CH3O-ip ligand, forming a helical chain running along a crystallographic 21 axis in the c-axis direction. These chains are decorated with 2,2′-bipy ligands on alternating sides. O—H⋯O hydrogen bonding involving the water molecules stabilizes the crystal structure.

In the title compound, [Cu(C7H3NO7S)(C10H8N2)(H2O)]·0.5C10H8N2, the CuII atom is six-coordinated by two N atoms from two different bipyridine (bipy) ligands, one sulfonate O atom and two carboxyl­ate O atoms from three 2-nitro-5-sulfonatobenzoate ligands and one water O atom in a distorted octa­hedral geometry. The bipy solvent mol­ecule lies on an inversion center. The CuII atoms are linked by the bipy ligands, forming one-dimensional chains, which are connected by the 2-nitro-5-sulfonatobenzoate ligands into a two-dimensional layer-like network. The two-dimensional structure is extended by O—H⋯O and O—H⋯N hydrogen bonds into a three-dimensional supra­molecular network.

The asymmetric unit of the title compound, {[Zn(C7H7O2)2(C10H8N2)]·4H2O}n, contains a highly distorted octa­hedral ZnII metal center strongly coordinated by two N atoms of two 4,4′-bipyridine (4,4′-bipy) ligands and chelated by two 4-methyl­benzoate anions. The crystallographic inversion center and glide plane present at the center of the C—C single bond of 4,4′-bipy, along with the cis coordination motif of the 4,4′-bipy, lead to one-dimensional zigzag chains. There are a large number of water mol­ecules in the crystal structure, which also form one-dimensional chains through O—H⋯O hydrogen bonds.

In the title compound, {[Mn(C14H14N4)2(H2O)2](NO3)2}n, the MnII ion is located on an inversion center and is coordinated by four N atoms from four 1,3-bis­(1H-imidazol-1-ylmeth­yl)benzene (L) ligands and two water mol­ecules in a distorted octa­hedral geometry. Two L ligands are related by a centre of symmetry and bridge MnII ions, forming a positively charged polymeric chain in [101]. Uncoordinated nitrate anions further link these chains into layers parallel to the ac plane via O—H⋯O hydrogen bonds.

The title compound, [Cu(C8H7O3)2(C10H8N2)]·H2O, is comprised of a CuII ion, two 3-meth­oxy­benzoate ligands, a 2,2′-bipyridine (bipy) ligand and one uncoordinated water mol­ecule. The CuII ion and the water O atom lie on a twofold axis. The CuII ion exhibits a six-coordinate distorted octa­hedral geometry, with two N atoms from the bipy ligand [Cu—N = 1.9996 (16) Å] and four O atoms from two 3-meth­oxy­benzoate ligands [Cu—O = 1.9551 (15) and 2.6016 (16) Å]. The mol­ecules are linked by O—H⋯O and C—H⋯O hydrogen bonds, forming a three-dimensional network.

The title CuII coordination polymer, {[Cu(C7H10N6)2(H2O)2](NO3)2·H2O}n, was obtained by the reaction of equimolar Cu(NO3)2·4H2O and 1,3-bis­(1,2,4-triazol-1-yl)propane (btp) in a water–methanol solvent. The CuII atom is located on a centre of inversion and has an elongated octa­hedral coordination geometry formed by four N atoms from four symmetry-related btp ligands and two coordinated water mol­ecules. Adjacent CuII atoms are connected by btp ligands, generating a double-stranded chain. The nitrate anion is disordered over two positions in a 0.828 (7):0.172 (2) ratio.

In the title compound, {[Cu(C7H4NO4)(C10H8N2)(H2O)]·H2O}n, the CuI ion is coordinated by the N atom from a 5-carb­oxy­pyridine-3-carboxyl­ate anion, two N atoms from two 4,4′-bipyridine (4,4′-bipy) ligands and one water mol­ecule in a distorted tetra­hedral geometry. The 4,4′-bipy ligands bridge the CuI ions into polymeric chains propagating in [201]. The latticeand the coordinating water mol­ecules as well as the carboxy OH function are involved in the formation of inter­molecular O—H⋯O hydrogen bonds, which consolidate the crystal packing.

In the crystal of the title compound, {[Zn(C5H5N3O)2(H2O)](NO3)2}n, the ZnII cation is N,O-chelated by two pyrazine-2-carboxamide (PCA) ligands and is further coordinated by one water mol­ecule and by one pyrazine-N atom from an adjacent PCA ligand in a distorted ZnN3O3 octa­hedral geometry. One of the two independent PCA ligands bridges two ZnII cations, forming a zigzag polymeric chain running along the c axis. In the crystal, the NO3 − anions link to the chain via O—H⋯O and N—H⋯O hydrogen bonding. Weak inter­molecular C—H⋯O inter­actions also occur.

In the title complex, {[Zn(C10H8N2)(H2O)4](C10H6O6S2)}n, the [Zn(4,4′-bipy)(H2O)4]2+ (4,4′-bipy is 4,4′-bipyridine) cations are linked into linear chains along [001] by the 4,4′-bipy ligands. The ZnII ion exhibits a slightly distorted octa­hedral coordination geometry in which the four water mol­ecules are in the equatorial positions. The anions are hydrogen bonded to the polycationic chains by O—H⋯O hydrogen bonds, forming a three-dimensional network. The ZnII ion, 4,4′-bipy ligand and anion lie on special positions of 2/m site symmetry.

The asymmetric unit of the title compound, {[Cu(C10H8N2S2)2(H2O)2](C8H5O4)2·H2O}n, contains one CuII ion, two bridging di-4-pyridyl disulfide (4-DPDS) ligands of the same chirality, two coordinating water mol­ecules, two hydrogen phthalate anions and one uncoordinated water mol­ecule. The polymeric structure consists of two types of polymeric chains, each composed from repeated chiral rhomboids. The CuII ions adopt a distorted octa­hedral coordination geometry and are coordinated by four pyridine N atoms and two water O atoms. The coordinated water mol­ecules and hydrogen phthalate anions are located between the repeated rhomboidal chains, and form hydrogen bonds with the coordinated water mol­ecules.

In the title compound, {[Cd(C9H5BrO4)(C10H8N2)(H2O)]·H2O}n, the CdII atom has a distorted octa­hedral coordination geometry. Two N atoms from two 4,4′-bipyridine (bipy) ligands occupy the axial positions, while the equatorial positions are furnished by three carboxyl­ate O atoms from three 3-bromo-2-(carboxyl­atometh­yl)benzoate (bcb) ligands and one O atom from a water mol­ecule. The bipy and bcb ligands link the CdII atoms into a three-dimensional network. O—H⋯O hydrogen bonds and π–π inter­actions between the pyridine and benzene rings [centroid–centroid distance = 3.736 (4) Å] are present in the crystal.

The CoII ion in the title complex, [Co(SO4)(C13H8N4)(H2O)2]n, has a slightly distorted octa­hedral coordination environment formed by two O atoms from two symmetry-related bridging sulfate ligands, two N atoms from a bis-chelating 1H-imidazo[4,5-f][1,10]phenanthroline (IPL) ligand and two O atoms from coordinated water mol­ecules. The bridging sulfate ligands connect CoII ions to form a one-dimensional chain along the b-axis direction. In the crystal structure, inter­molecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds link the chains into a three-dimensional network.

In the title compound, [Cd(C16H10O4)(C14H8N4)(H2O)]·0.5C3H7NO, the CdII atom is six-coordinated by two N atoms from one pyrazino[2,3-f][1,10]phenanthroline ligand, three carboxyl­ate O atoms from two different 4,4′-ethyl­enedibenzoate ligands, and one water mol­ecule in a distorted octa­hedral environment. The two 4,4′-ethyl­enedibenzoate dianions are located on inversion centres bridging two neighboring CdII centres. O—H⋯O hydrogen-bonding inter­actions further stabilize the crystal structure. The DMF molecule is equally disordered about a center of inversion.

In the title compound, {[Zn(C9H10NO3)(C10H8N2)2(H2O)]NO3·2H2O}n, the ZnII atom is six-coordinated in a distorted octa­hedral geometry by two carboxyl­ate O atoms and one amino N atom from two l-tyrosinate ligands, two N atoms from two 4,4′-bipyridine ligands, and one water mol­ecule. Adjacent Zn atoms are bridged by the bidentate carboxyl­ate groups into a cationic chain extending along [010]. N—H⋯N, O—H⋯N and O—H⋯O hydrogen bonds link the cationic chains, nitrate anions and uncoordinated water mol­ecules into a supra­molecular network. π–π inter­actions between the pyridine rings and between the pyridine and benzene rings [centroid–centroid distances = 3.615 (4) and 3.636 (4) Å] are present.

In the title compound, [Ni(C14H8O4)(C10H8N2)(H2O)2]n, the NiII atom is coordinated in a slightly distorted octa­hedral geometry by two water mol­ecules, two N atoms from a 2,2′-bipyridine ligand and two O atoms from the carboxyl­ate groups of two 2,2′-biphenyl­dicarboxyl­ate (2,2′-dpa) ligands. The 2,2′-dpa ligand acts as a bridge between neighbouring NiII atoms, forming one-dimensional coordination polymers along [100]. The coordinated water mol­ecules form hydrogen bonds to the carboxyl­ate O atoms of 2,2′-dpa within the same coordination polymer, and one O—H⋯π inter­action is also formed to 2,2′-dpa.

There are two crystallographically independent complex mol­ecules with very similar geometries in the unit cell of the title compound, [Mn(C6H4NO2)2(H2O)2]·0.5C3H7NO. The central ion is situated in a distorted octa­hedral environment of two N- and four O-donor atoms from two pyridine-2-carboxyl­ate ligands and two cis-disposed water mol­ecules. The carboxyl­ate ligands are coordinated in a chelate fashion with the formation of two five-membered rings. In the crystal, the complex mol­ecules are connected by O—H⋯O hydrogen bonds between the coordinated water mol­ecules and the uncoordinated carboxyl­ate O atoms, thus forming hydrogen-bonded walls disposed perpendicularly to the bc plane.

In the title compound, {[Zn(C10H8N2)(H2O)4](C4H2O4)·4H2O}n, the ZnII atom is coordinated by two N atoms from two μ-4,4′-bipyridine ligands and four water mol­ecules in a distorted octa­hedral geometry. The coordination unit is extended through the Zn—N bond, leading to a one-dimensional cationic chain. A twofold rotation axis passes through the Zn atom and along the axis of the 4,4′-bipyridine ligand. Each uncoordinated water mol­ecule acts as both hydrogen-bond donor and acceptor. A three-dimensional network is constructed through hydrogen bonds involving water mol­ecules and fumarate dianions.

In the title compound, {[Ni(C10H8N2)(H2O)4](C12H8O4)}n, the NiII, 4,4′-bipyridyl (bipy) and 3,3′-(p-phenyl­ene)diacrylate (L 2−) moieties are situated on inversion centres. The bipy ligands bridge NiII ions into positively charged polymeric chains along [101]. The NiII atom is coordinated by two N atoms from two bipy ligands and four water mol­ecules in a distorted octa­hedral geometry. L 2− anions inter­act with the polymeric chains via O–H⋯O hydrogen bonds, forming a three-dimensional supra­molecular network.

The 1,4-dicarboxyl­ate dianions in the title compound, [Mn(C12H6O4)(C19H12N4O)2]·0.5C12H8O4·H2O, bond to two 4-(1H-1,3,7,8-tetra­azacyclo­penta­[l]phenanthren-2-yl)phenol-chelated Mn atoms to form a chain that features the metal atom in an octa­hedral coordination geometry. Adjacent chains inter­act with the uncoordinated water mol­ecules to form a three-dimensional network. The naphthalene-1,4-dicarboxylic acid solvent mol­ecule, which is disordered about a centre of inversion, occupies the space within the network but is not bonded to the network. One NH group is disordered equally over two positions.

The title complex, [Ni(C12H8N2)2(H2O)2][Ni(CN)4]·C4H8O·H2O, consists of a cationic [Ni(C12H8N2)2(H2O)2]2+ unit, an anionic [Ni(CN)4]2− unit, one uncoordinated water and one tetra­hydro­furan mol­ecule. In the cationic unit, the Ni2+ atom is coordinated by four N atoms and two O atoms from two 1,10-phenanthroline ligands and two water mol­ecules in a distorted octa­hedral coordination environment. In the anionic unit, the Ni2+ atom is in a square-planar coordination by four C atoms from four monodentate terminal cyanide ligands. O—H⋯N and O—H⋯O hydrogen bonds link neighboring cationic and anionic units, forming a three-dimensional supra­molecular network. The inter­stitial tetra­hydro­furan mol­ecule is independently disordered over two sites in a 1:1 ratio.

A new cadmium(II) coordination polymer, {[Cd(C8H4O4)(C12H8N2)(H2O)]·0.5C8H6O4}n, has been synthesized under hydro­thermal conditions. The asymmetric unit contains one CdII atom, one benzene-1,4-dicarboxyl­ate anion, one 1,10-phenanthroline ligand, one coordinated water mol­ecule and half of an uncoordinated benzene-1,4-dicaboxylic acid solvent mol­ecule. The CdII atom is in the centre of a monocapped distorted octa­hedron made up of four O atoms of two chelating benzene-1,4-dicarboxyl­ate anions, one water O atom and two 1,10-phenanthroline N atoms. The metal centres are connected via bis-chelating benzene-1,4-dicarboxyl­ate anions into a zigzag chain structure along [001]. These chains are further connected by O—H⋯O hydrogen bonds between the water mol­ecules and adjacent carboxyl­ate O atoms. Additional O—H⋯O hydrogen bonding between the uncoordinated benzene-1,4-dicaboxylic acid mol­ecules along [010] consolidates the structure.

In the title compound, {[Cu(C10H14N4)2(H2O)2](NO3)2}n, the CuII ion lies on an inversion center and is six-coordinated in an octa­hedral environment by four N atoms from four different 1,1′-butane-1,4-diyldiimidazole ligands and two O atoms from the two water mol­ecules. Bridging by the ligands results in a ribbon structure. Adjacent ribbons are linked to the nitrate anions via O—H⋯O hydrogen bonds, forming layers. One nitrate O atom is disordered equally over two positions.

The title compound, [Zn(C8H7O2)(C10H8N2)2](C8H7O2)·C8H8O2·2H2O, is comprised of a Zn2+ cation, two 2,2′-bipydine (bipy) ligands and one 3-methyl­benzoate anion (L −) together with one uncoordinating L − anion, one uncoordinating HL mol­ecule and two lattice water mol­ecules. The ZnII atom is coordinated by four N atoms of two bipy ligands and two O atoms from one L − ligand in a distorted octa­hedral geometry. Pairs of centrosymmetrically related complex mol­ecules form dimers via slipped π-stacking inter­actions between bipy ligands with an inter­planar distance of 3.470 (4) Å. The dimers are linked into supra­molecular chains along [111], via C—H⋯O hydrogen bonds. The uncoordinated L − anions, HL mol­ecules and water mol­ecules are connected with each other via O—H⋯O hydrogen bonds, forming chains between the metal complex chains and binding them together via C—H⋯O contacts. The resulting layers parallel to (010) are further assembled into a three-dimensional supra­molecular architecture through additional C—H⋯O inter­actions.

In the title compound, {[Zn2(C6H14N2O2)2(C10H8N2)3](NO3)4·0.6H2O·2C3H7NO}n, the ZnII ion is six-coordinated with a distorted octa­hedral geometry by two carboxyl­ate O atoms and one amino N atom from two l-lysinate (l-lys) ligands, and three N atoms from three 4,4′-bipyridine (4,4′-bipy) ligands. The ZnII ions are connected by the carboxyl­ate groups of the l-lys ligands in the a-axis direction and the bridging 4,4′-bipy ligands in the b- and c-axis directions, forming a three-dimensional cationic framework with channels along [100]. The nitrate anions and solvent water and dimethyl­formamide (DMF) mol­ecules are located in the channels and linked to the cationic framework by N—H⋯O and O—H⋯O hydrogen bonds. The occupancy of the water mol­ecule was fixed at 0.6. One of the DMF mol­ecules is disordered over two sets of sites, with an occupancy ratio of 0.632:0.368 (11).