Jun-Hua Li

Hexakis(1H-imidazole-κN3)mangan­ese(II) triaqua­tris(1H-imidazole-κN3)manganese(II) bis­(naphthalene-1,4-dicarboxyl­ate)

In the crystal structure of the title compound, [Mn(C(3)H(4)N(2))(6)][Mn(C(3)H(4)N(2))(3)(H(2)O)(3)](C(12)H(6)O(4))(2), there are uncoordinated naphthalene-dicarboxyl-ate dianions and two kinds of Mn(II) complex cations, both assuming a distorted octa-hedral geometry. One Mn(II) cation is located on an inversion center and is coordinated by six imidazole mol-ecules, while the other Mn(II) cation is located on a twofold rotation axis and is coordinated by three water mol-ecules and three imidazole units. The naphthalene-dicarboxyl-ate dianions are linked to both Mn(II) complex cations via O-H⋯O and N-H⋯O hydrogen bonding, but no π-π stacking is observed between aromatic rings in the crystal structure.

Bis(μ-4-chloro-2-oxidobenzoato)bis-[(1,10-phenanthroline)copper(II)] dihydrate.

The structure of the the title compound, [Cu2(C7H3ClO3)2(C12H8N2)2]·2H2O, consists of a dimeric unit involving a planar Cu2O2 group arranged around an inversion center. The coordination sphere of the CuII atom can be described as an elongated distorted square pyramid where the basal plane is formed by the two N atoms of the 1,10-phenanthroline molecule and the two O atoms of the hydroxychlorobenzoate (hcbe) anion. The long apical Cu—O distance of 2.569 (2) Å involves the O atom of a symmetry-related hcbe anion, building up the dinuclear unit. Each dinuclear unit is connected through O—H⋯O hydrogen bonds involving two water molecules, resulting in an R 4 2(8) graph-set motif and building up an infinite chain parallel to (10). C—H⋯O interactions further stabilize the chain.

cyclo-Tetra-μ-malato-κ16O,O′,O′′:O′′′-tetra­kis[bis­(1H-benzimidazole-κN3)cobalt(II)] eicosa­hydrate

The title compound, [Co4(C4H4O5)4(C7H6N2)8]·20H2O, consists of tetranuclear CoII complexes and disordered uncoordinated water molecules. The tetrameric complex molecule has symmetry. While two benzimidazole molecules and a tridentate malate dianion coordinate a CoII ion, the carboxylate O atom from an adjacent malate dianion bridges the CoII ions to complete a distorted octahedral coordination geometry. The tridentate malate dianion chelates the CoII ion, and the chelate six- and five-membered rings show half-chair and envelope configurations, respectively. A face-to-face separation of 3.494 (9) Å between parallel benzimidazole ligands indicates the existence of π–π stacking between adjacent complexes. The crystal structure also involves N—H⋯O and O—H⋯O hydrogen bonds.

Hexakis(1H-imidazole-κN3)nickel(II) triaqua­tris(1H-imidazole-κN3)nickel(II) bis­(naphthalene-1,4-dicarboxyl­ate)

The crystal structure of the title compound, [Ni(C3H4N2)6][Ni(C3H4N2)3(H2O)3](C12H6O4)2, contains uncoordinated naphthalenedicarboxylate dianions and two kinds of NiII complex cations, both assuming distorted octahedral geometries. One NiII ion is located on an inversion center and is coordinated by six imidazole molecules, while the other NiII ion is located on a twofold rotation axis and is coordinated by three water molecules and three imidazole molecules in a mer-NiN3O3 arrangement. The naphthalenedicarboxylate dianion links both NiII complex cations via O—H⋯O and N—H⋯O hydrogen bonding, but no π–π stacking is observed between aromatic rings in the crystal structure. One imidazole ligand is equally disordered over two sites about a twofold rotation axis; one N atom and one water O atom have site symmetry 2.

catena-Poly[[[aqua-bis(1H-imidazole-κN)copper(II)]-μ-naphthalene-1,4-dicarboxyl-ato-κO:O] dihydrate].

In the title compound, {[Cu(C12H6O4)(C3H4N2)2(H2O)]·2H2O}n, the CuII cation is coordinated by two naphthalene-1,4-dicarboxylate (naph) dianions, two imidazole molecules and one water molecule in a distorted square-pyramidal geometry. The Cu—O bond distance in the apical direction is 0.509 (3) Å longer than the mean Cu—O bond distance in the basal plane. The naph dianion bridges two CuII cations, forming a one-dimensional polymeric chain. The coordinated water molecule is hydrogen-bonded to the carboxylate groups and imidazole ligands of adjacent polymeric chains, forming a three-dimensional supramolecular structure. No π–π stacking is observed in the crystal structure. One solvent water molecule is disordered equally over two positions.

Bis(3-hydroxy-pyridine-κN)bis-(3-nitro-benzoato-κO)zinc(II).

The title complex, [Zn(C7H4NO4)2(C5H5NO)2], has site symmetry 2. The ZnII ion is located on a crystallographic twofold rotation axis and assumes a distorted tetrahedral ZnN2O2 coordination geometry. Molecules are linked by an intermolecular O—H⋯O hydrogen bond and π–π stacking interactions between pyridine rings [centroid–centroid speparation 3.594 (1) Å].

Bis(3-hydroxy-pyridinium) fumarate.

The crystal structure of the title compound, 2C5H6NO2 +·C4H2O4 2−, consists of 3-hydroxypyridinium cations and fumarate dianions. The dianion is located on an inversion center and the cation is linked to it by O—H⋯O and N—H⋯O hydrogen bonds. The cation is twisted with respect to the anion by 24.83 (5)°.

Hexakis(1H-imidazole-κN)cobalt(II) triaqua-tris(1H-imidazole-κN)cobalt(II) bis-(naphthalene-1,4-dicarboxyl-ate).

The asymmetric unit of the title compound, [Co(C3H4N2)6][Co(C3H4N2)3(H2O)3](C12H6O4)2, contains two halves of crystallographically independent CoII complex cations, each assuming a distorted octahedral geometry, and one uncoordinated naphthalene-1,4-dicarboxylate dianion. One CoII cation is located on an inversion center and is coordinated by six imidazole molecules, while the other CoII cation is located on a twofold rotation axis and is coordinated by three water and three imidazole molecules. The uncoordinated naphthalene-1,4-dicarboxylate dianion links both CoII complex cations via O—H⋯O and N—H⋯O hydrogen bonding. One imidazole ligand is equally disordered over two sites about a twofold rotation axis, while the coordinated N atom of the imidazole is located on the twofold rotation axis. One water O atom has site symmetry 2.

Aqua(3-hydroxybenzoato-κO)bis(1,10-phenanthroline-κ2N,N′)cobalt(II) 3-hydroxybenzoate pentahydrate

The crystal structure of the title compound, [Co(C(7)H(5)O(3))(C(12)H(8)N(2))(2)(H(2)O)](C(7)H(5)O(3))·5H(2)O, consists of Co(II) complex cations, uncoordinated hydroxy-benzoate anions and uncoord-inated water mol-ecules. The Co(II) ion is coordinated by two phenanthroline ligands, a water mol-ecule and a 3-hydroxy-benzoate anion, and displays a distorted octa-hedral geometry. π-π stacking is observed between parallel phenanthroline ligands, the face-to-face separations being 3.454 (19) and 3.435 (7) Å. An extensive hydrogen-bonding network helps to stabilize the crystal structure. The hydroxybenzoate ligand is disordered over two positions, with site occupancy factors 0.6 and 0.4. One solvent water molecule is also disordered over two positions, with site occupancy factors 0.6 and 0.4.

Aqua­(3-hydroxy­benzoato-κO)bis­(1,10-phenanthroline-κ2N,N′)cobalt(II) 3-hydroxy­benzoate penta­hydrate

The crystal structure of the title compound, [Co(C(7)H(5)O(3))(C(12)H(8)N(2))(2)(H(2)O)](C(7)H(5)O(3))·5H(2)O, consists of Co(II) complex cations, uncoordinated hydroxy-benzoate anions and uncoord-inated water mol-ecules. The Co(II) ion is coordinated by two phenanthroline ligands, a water mol-ecule and a 3-hydroxy-benzoate anion, and displays a distorted octa-hedral geometry. π-π stacking is observed between parallel phenanthroline ligands, the face-to-face separations being 3.454 (19) and 3.435 (7) Å. An extensive hydrogen-bonding network helps to stabilize the crystal structure. The hydroxybenzoate ligand is disordered over two positions, with site occupancy factors 0.6 and 0.4. One solvent water molecule is also disordered over two positions, with site occupancy factors 0.6 and 0.4.