Fu-Chen Liu

catena-Poly[[(pyrimidine-2-carb­oxy­lic acid)iron(II)]-μ-oxalato]

In the title complex, [Fe(C2O4)(C5H4N2O4)]n, the FeII ion is coordinated by two oxalate anions and a pyrimidine-2-carboxylic acid ligand in a slightly distorted octahedral geometry. Each oxalate anion chelates to two FeII ions, forming chains along the a axis. The chains are further connected by O—H⋯O and C—H⋯O hydrogen bonds, stabilizing the structure. An intramolecular O—H⋯N interaction results in a five-membered ring.

catena-Poly[[(1,10-phenanthroline)cobalt(II)]-di-μ-azido].

In the crystal structure of the binuclear title complex, [Co(N3)2(C12H8N2)]n, each CoII cation is coordinated by two N atoms from one chelating 1,10-phenanthroline ligand and four azide ligands in a slightly distorted octahedral coordination. The two CoII cations of the binuclear complex are related by an inversion centre and are bridged by two symmetry-related azide ligands in both μ1,1 and μ1,3 modes. The μ1,3 bridging mode gives rise to an infinite one-dimensional chain along the a axis, whereas the μ1,1 bridging mode is responsible for the formation of the binuclear CoII complex.

Bis[N,N-bis-(2-hy-droxy-eth-yl)glycinato]cobalt(II).

The asymmetric unit of the title compound, [Co(C6H12NO4)2], contains one half-molecule with the CoII ion situated on an inversion center. Intermolecular O—H⋯O hydrogen bonds generate a three-dimensional hydrogen-bonding network, which consolidates the crystal packing.

Diaqua­bis(tetra­zolo[1,5-a]pyridine-8-carboxyl­ato-κ2N1,O)cobalt(II) dihydrate

In the title compound, [Co(C6H3N4O2)2(H2O)2]·2H2O, the CoII atom is located on an inversion center in a slightly distorted octahedral environment formed by the O atoms of two water molecules, and the N and O atoms of the chelating tetrazolo[1,5-a]pyridine-8-carboxylate anions. Hydrogen bonds of the O—H⋯O and O—H⋯N types result in a three-dimensional supramolecular network.

Poly[μ-azido-(μ3-nicotinato N-oxide)zinc(II)]

The title compound, [Zn(C6H4NO3)(N3)], has been prepared by the reaction of nicotinate N-oxide acid, zinc(II) nitrate and sodium azide. The Zn atom is five coordinated by two azide anions and three nicotinate N-oxide ligands. Each nicotinate N-oxide bridges three Zn atoms, whereas the azide bridges two Zn atoms, resulting in the formation of a two-dimensional metal–organic polymer developing parallel to (100).

Tetra-kis(μ-2-anilinobenzoato)bis-[methano-lcopper(II)](Cu-Cu).

The title compound, [Cu2(C13H10NO2)4(CH4O)2], has been prepared by the reaction of 2-anilinobenzoic acid, HL, with copper(II) nitrate in methanol. This dinuclear complex is arranged around an inversion center. Each Cu atom displays a distorted trigonal–pyramidal coordination with four O atoms from the four ligands L and one axial O atom of the methanol solvent molecule. Each carboxylate group of the ligands L links two Cu atoms, building a dinuclear complex with a Cu—Cu distance of 2.5774 (10) Å. There are intramolecular N—H⋯O hydrogen bonds, and the H atom of the methanol molecule is involved in weak bifurcated hydrogen-bonding interactions with two carboxylate O atoms of related molecules, forming a chain developing parallel to the a axis.

Poly[di-μ3-azido-μ2-4,4′-bipyridine-dicopper(I)]

In the crystal structure of the title compound, [Cu2(N3)2(C10H8N2)]n, each CuI atom is coordinated by two symmetry-related azide anions and 4,4′-bipyridine (bipy) ligands in a strongly distorted tetrahedral geometry. The Cu atom and the azide anion occupy general positions while the bipy molecule is located on a centre of inversion. Each two symmetry-related copper(I) cations and two symmetry-related azide anions form dimers, which are additionally connected by the anions into layers. These layers are linked by the 4,4′-bipyridine ligands into a three-dimensional coordination network.

Tetra-μ-benzoato-bis­[(3,5-dimethyl­pyridine)­copper(II)]

In the centrosymmetric binuclear title compound, [Cu2(C7H5O2)4(C7H9N)2], the CuII atom is coordinated by four O atoms from benzoate anions and one N atom from a dimethylpyridine ligand. A paddle-wheel-like dimer is formed by two CuII ions and four benzoate anions with two 3,5-dimethylpyridine ligands at the axial position of the CuII ions. The dihedral angle between the two unique benzene rings is 84.26 (16)°. The dihedral angles between the pyridine ring and the benzene rings are 61.67 (15) and 34.27 (14)°. There is π–π stacking of inversion-related pyridine rings, with a centroid–centroid distance of 3.833 (2) Å.

Poly[tetra-μ1,1-azido-bis­(μ2-pyrimidine-2-carboxyl­ato)tricopper(II)]

In the title compound, [Cu3(C5H3N2O2)2(N3)4]n, one of the CuII atoms lies on an inversion centre and is octahedrally coordinated by two bidentate chelating pyrimidine-2-carboxylate ligands and two azide anions, each of which gives an N:N-bridge to the second inversion-related CuII centre in the formula unit. The second CuII atom is five-coordinated with a distorted square-pyramidal coordination sphere comprising a single bidentate chelating pyrimidine-2-carboxylate anion and three azide N anions, two of which doubly bridge centrosymmetric CuII centres, giving a two-dimensional network structure extending parallel to (010).

Poly[aqua­(μ1,1-azido)(μ-3H-1,2,3-tri­azolo[4,5-b]pyridin-3-olato)cobalt(II)]

In the title compound, [Co(C5H3N4O)(N3)(H2O)]n, the cobalt ion is coordinated by three N atoms of two organic ligands, two N atoms of two azide anions and one water molecule in a distorted octahedral geometry. The metal atoms are connected via the ligands into layers, which are further connected by O—H⋯N and O—H⋯O hydrogen bonding.