Dong-Sheng Liu

Structural variation from 1D to 3D: effect of metal centers on the construction of metal–organic coordination polymers with N-(1H-tetrazol-5-yl)benzamide ligand

A new multifunctional semirigid acylamide ligand comprising a tetrazole ring, N-(1H-tetrazol-5-yl)benzamide (HL), has been synthesized, with which five coordination polymers of different metal ions, namely, CdL2 (1), AgL (2), MnL2 (3), CuL2 (4), PbL2 (5), have been prepared and characterized by elemental analysis, infrared spectroscopy and single-crystal X-ray diffraction. The X-ray diffraction analysis reveals that compound 1 crystallized in a chiral space group and is a 3D non-interpenetrated diamondoid framework with Cd(II) centers in tetrahedral geometry. Compound 2 is a 2D coordination polymer with a 3-connected 4·82-fes topology. Compounds 3 and 4 are isomorphous, and both of them exhibit an interesting 2D 44-sql network while compound 5 shows 1D zigzag chains. Thermal stabilities, photoluminescence and NLO properties have also been studied.

Poly[bis(μ‐4‐benzoyl‐1‐isonicotinoylthiosemicarbazide‐κ2N:S)dichloridocadmium(II)]

The asymmetric unit of the title complex, [CdCl(2)(C(14)H(12)N(4)O(2)S)(2)](n), consists of one Cd(II) ion located on the crystallographic inversion centre, one 4-benzoyl-1-isonicotinoylthiosemicarbazide ligand and one chloride ligand. The central Cd(II) ion adopts a distorted octahedral coordination geometry formed by two pyridyl N atoms of two ligands, two S atoms of two other ligands and two chloride ligands. The thiosemicarbazide ligands act as bridges, linking the metal ions into a two-dimensional layered structure parallel to the bc plane. Intermolecular N-H...O hydrogen bonds and C-H...pi interactions exist between adjacent layers.

Poly[(μ2-aqua-κ2O:O)(μ3-azido-κ3N1:N1:N3)(μ2-isonicotinato-κ2O:O′)­lead(II)]

In the title compound, [Pb(C(6)H(4)NO(2))(N(3))(H(2)O)](n), the Pb ion is seven-coordinated by three N atoms from three azide ligands, two O atoms from two isonicotinate (inic) ligands and two O atoms from two coordinated water molecules, forming a distorted monocapped triangular prismatic coordination geometry. Each azide ligand bridges three Pb(II) ions in a mu(1,1,3) coordination mode to form a two-dimensional three-connected 6(3) topology network extending in the bc plane. The carboxylate group of the inic unit and the aqua ligand act as coligands to bridge Pb(II) ions. Adjacent two-dimensional layers are connected by hydrogen-bonding interactions between the isonicotinate N atom and the water molecule, resulting in an extended three-dimensional network. The title complex is the first reported coordination polymer involving a p-block metal, an azide and a carboxylate.

Bis(dimethylformamide-2κO)bis[μ-1-(2-oxidobenzoyl)-2-(phenoxyacetyl)hydrazine(3−)]-1κ3O,N,O′:2κ2N,O′′;2κ2N,O′′:3κ3O,N,O′-dipyridine-1κN,3κN-trinickel(II)

The trinuclear nickel(II) title compound, [Ni3(C15H12xadN2O4)2(C5H5N)2(C3H6NO)2], possesses a crystallographically imposed centre of symmetry. The central Ni atom adopts an axially elongated octaxadhedral geometry, involving two N and two O atoms from two phenoxyxadacetylxadsalicylhydrazidate ligands in the equatorial plane and two O atoms from two dimethylxadformamide molxadecules in the axial positions. The inversion-related outer Ni atoms have square-planar coordination environments provided by two O atoms and one N atom of a phenoxyxadacetylxadsalicylhydrazidate ligand and by the N atom of a pyridine molxadecule. The shortest metal–metal separation is 4.6038u2005(11)u2005A. The molxadecular structure is stabilized by intraxadmolecular C—H⋯O hydrogen-bonding interxadactions.

SYNTHESIS, STRUCTURE AND LUMINESCENCE OF A HYDROGEN-BONDING HELICAL-CHAIN CU (II) COMPOUND BASED ON (8-QUINOLINYLOXY)ACETATE

A new compound of CuCl(QOA)(H2O) (1) [QOAxa0=xa0(8-quinolinyloxy)acetate] has been prepared and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The crystal is of orthorhombic, space group P212121 with axa0=xa05.364(1)xa0Å, bxa0=xa013.876(3)xa0Å, cxa0=xa015.435(3)xa0Å, Vxa0=xa01,148.8(4)xa0Å3, Mrxa0=xa0319.19, Dcxa0=xa01.846xa0gxa0cm−3, Zxa0=xa04, F(000)xa0=xa0644, μxa0=xa02.138xa0mm−1, flack parameterxa0=xa00.00(17), the final Rxa0=xa00.0311 and wRxa0=xa00.0646 for 2,179 observed reflections (Ixa0>xa02σ(I)). Compound 1 consists of one-dimensional helical chains deriving from CuCl(QOA)(H2O) units linked by hydrogen bonds and further extend into a 3D supramolecular structure through Van der Waals interactions, and it exhibits strong luminescent emission at room temperature.

μ-Acetato-tri-μ-ferrocenecarboxyl­ato-bis­[(N,N-dimethyl­formamide)copper(II)]

The title compound, [Cu2Fe3(C5H5)3(C2H3O2)(C6H4O2)3(C3H7NO)2], contains a dinuclear copper(II) paddlewheel unit, where the metal ions are bridged by the O atoms of three ferrocenecarboxylxadate groups and one acetate group. The crystal packing is mainly determined by van der Waals interxadactions.

Piperazinium tetraaquadi-μ-citrato-dinickelate(II)

The title complex, (C4H12N2)[Ni2(C6H5O7)2(H2O)4], was synthesized under solvothermal conditions. Both cation and anion possess crystallographically imposed inversion symmetry. The citrate ion acts as a quadridentate ligand, coordinating through the hydroxyl and two carboxylate O atoms to one nickel atom, and bridging the second metal centre through the remaining carboxylate group. The coordination around each NiII atom is completed to distorted octaxadhedral by the O atoms of two water molxadecules. The crystal structure is stabilized by intra- and interxadmolecular O—H⋯O and N—H⋯O hydrogen-bonding interxadactions.