Changcang Huang

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.

Barium divanadium(V) tellurite(IV)

A new three-dimensional bimetallic tellurite, BaV2TeO8, was synthesized by the hydrothermal reaction of Ba(OH)2, TeO2 and V2O5, and characterized by single-crystal X-ray diffraction. The three-dimensional framework is built up from anionic [V2TeO8]n(2n-) layers parallel to (101) and connected via Ba-O bonds. The anionic layers are formed by three types of polyhedra, namely VO5 tetragonal pyramids, VO(4) tetrahedra and TeO(4+2) folded square polyhedra.

Synthesis, Characterization, and Electronic Structures of Organically Templated Lead Halides with One- and Two-Dimensional Hybrid Structures, [(nbq)(PbI3)]n and {[(CH3)3NC2H4N(CH3)3]3(Pb6I18)}n

Two new organically templated lead(ii) iodide complexes, [(nbq)(PbI3)]n 1 and {[(CH3)3NC2H4N(CH3)3]3(Pb6I18)}n 2, have been synthesized in the presence of aromatic and aliphatic quaternary ammonium compounds, N-(n-butyl)quinolinium (nbq+) and [(CH3)3NC2H4N(CH3)3]2+, respectively, acting as structure-directing agents. Both 1 and 2 consist of uncoordinated structure-directing agents and inorganic moieties bound to the organic structure-directing agents. In 1, an inorganic (PbI3–)n one-dimensional polyanion chain is built up by face-sharing of distorted PbI6 tetrahedra. The inorganic framework of 2 presents a two-dimensional arrangement that could be discussed in terms of [Pb3I10]4– building blocks. Static attractive interactions between organic countercations and inorganic moieties were revealed through the crystal packing. Density functional theory calculations indicate that 1 possesses semiconductor properties, tuned by the π-electrons of nbq+. In contrast, 2 is conductive in the direction of aliphatic quaternary ammonium moiety.

Isomorphous La, Nd, and Gd-PCPA-based polymers

An isomorphous series of three novel lanthanide coordination polymers [Ln(PCPA)3(glycol)] n , [where, Lnu2009=u2009La(1); Nd(2); Gd(3); PCPAu2009=u2009p-chlorophenoxyacetate] have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectra, TG analysis, fluorescence spectra and single crystal X-ray diffraction analysis. The results reveal that all of them form a chain-like one-dimensional structure. Photoluminescent properties for the complexes are also reported.

mer-Bis(1,4-dibenzoylthiosemicarbazidato-κ3O,N,O′)cobalt(II)

The title complex, [Co(C(15)H(12)N(3)O(2)S)(2)], consists of an octahedrally coordinated Co(II) ion, with two crystallographically independent 1,4-dibenzoylthiosemicarbazidate ligands in a tridentate mer coordination [Co-O = 2.064 (3)-2.132 (3) A and Co-N = 2.037 (3)-2.043 (3) A]. There are intermolecular N-H...S hydrogen bonds involving one ligand and strong pi-pi stacking interactions involving the other ligand, resulting in a three-dimensional supramolecular framework. The hydrogen bonds and pi-pi interactions, as well as different intramolecular aryl-benzamide H-C...H(-N) distances, give rise to a difference in conformation between the two ligands.

Ethyl­enediammonium bis­(trihydrogen 1,2,4,5-benzene­tetra­carboxyl­ate) dihydrate

Colourless crystals of the title compound, C2H10N22+·2C10H5O8−·2H2O, were isolated from an aqueous solution. The basic structural unit consists of two trihydrogen 1,2,4,5-benzenexadtetraxadcarboxylxadate (H3btec−) anions, an ethylxadenediammonium cation and two solvent water molxadecules. The ethylxadenediammonium cation is centrosymmetric. The anion has a short intraxadmolecular hydrogen bond of 2.427u2005(4)u2005A involving a deprotonated carboxylxadate group as acceptor. A three-dimensional hydrogen-bonding network defines the crystal packing, and solvent water molxadecules and the cations occupy voids in the crystal structure.

Piperazinium aqua­bis­(oxalato)­oxovanadate(IV) sesquihydrate

A mononuclear VIV complex, (C4H12N2)[VO(C2O4)2(H2O)]·1.5H2O, with bisxad(oxalate) ligands, has been synthesized under hydroxadthermal conditions. The structure contains aquaxadbisxad(oxalato)xadoxovanadium(IV) complex anions, [VO(C2O4)2(H2O)]2−, and diprotonated piperazine cations, [C4N2H12]2+. The ions are connected through hydrogen bonds to form a three-dimensional network with micropores, where uncoordxadinated water molxadecules are located with the some degree of disorder. The V center has distorted octahedral geometry with one terminal O atom, four O atoms from two oxalate groups and one water O atom. The two oxalate groups are cis arranged. The V—O bond lengths are in the range 1.599u2005(2)–2.216u2005(2)u2005A.

Bis{4‐[4‐(dimethylamino)styryl]‐1‐ethylpyridinium} di‐μ‐iodido‐bis[iodidocuprate(II)]

The title compound, (C17H21N2)2[Cu2I4], consists of an organic cation, 4-[4-(dimethylxadamino)strxadyl]-1-ethylxadpyrdinium, and an inorganic anion, [Cu2I4]2−. The Cu(I) atom exhibits a trigonal coordination. The anions form discrete centrosymmetric dimers about inversion centers and are surrounded by the cations.

A new mixed-valence CuII/CuI complex: chloro­bis(1,10-phenanthroline)copper(II) di­chloro­cuprate(I)

A new mixed-valence CuII/CuI complex, dark-green [CuCl(phen)2][CuCl2] (phen = phenanthroline, C12H8N2), consisting of isolated [Cu(phen)2Cl]+ cations and [CuCl2]− anions, has been synthesized under hydroxadthermal conditions. The [Cu(phen)2Cl]+ cation contains a five-coordinated Cu2+ ion, coordinated by two bidentate phenanthroline ligands and a Cl atom. Each dixadchloroxadcuprate counter-ion contains a monovalent Cu+ ion, which occupies a special position on a twofold axis.

An oxygen-centred tetranuclear tantalum cluster : Ta4O(Te2)4TeI4

Tetratantalum nonatellurium tetraiodide oxide exhibits a one-dimensional structure containing distorted tetrahedral oxygen-centred tetranuclear clusters of Ta atoms. Each of the four shorter Ta-Ta bonds is bridged by a Te 2 group, and each Ta atom is also bonded to a terminal I atom and a μ4 0 atom. A μ4 Te atom connects two neighbouring clusters to form a one-dimensional chain along the b axis. The chains are held together by van der Waals interactions.