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31 citations found for Tao, J
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In the title complex, poly[copper(II)-di-μ-5-carboxy-1H-imidazole-4-carboxylato], [Cu(C5H3N2O4)2]n or [Cu(H2Imda)2]n, each imidazole moiety is bonded to the Cu atom via O and N atoms to give a square-planar coordination [Cu—O = 2.014 (2) and 2.016 (2) Å, and Cu—N = 1.982 (3) and 1.992 (2) Å]. The distorted square-pyramidal geometry at the Cu atom results from coordination to an adjacent O atom [Cu—O = 2.305 (2) Å], which generates zigzag chains. There is a sixth, weaker, octahedral coordination to the Cu atom from an inversion-related O atom [Cu—O = 3.090 (2) Å], which links the chains into sheets in the (100) plane. Imidazole moieties in the sheets are linked in the [100] direction by pairs of N—H
O and C—H
O hydrogen bonds, thus generating a three-dimensional network.
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![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
A zinc(II) compound, prepared by the reaction of Zn(NO3)2·6H2O with naphthalene-2,6-dicarboxylic acid and 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene in a mixture of H2O and dimethylformamide, possesses a twofold interpenetrating two-dimensional network. The compound exhibits strong fluorescence emissions and a high photocatalytic activity for the degradation of Rhodamine B (RhB) under UV-light irradiation.
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A zinc(II) compound, prepared by the reaction of Zn(NO3)2·6H2O with 5-nitrobenzene-1,3-dicarboxylic acid (NO2-H2BDC) and 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene (1,3-BMIB) in H2O, is a new two-dimensional ZnII coordination polymer with a (4,4) topology parallel to the (10
) crystal planes based on left-handed helices, right-handed helical NO2-BDC–Zn chains and [Zn2(1,3-BMIB)2]n clusters. The compound exhibits strong fluorescence emissions in the solid state at room temperature.
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![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
Rietveld refinement of the novel vanadium aliovalent substituted zirconium tungstate ZrW1.8V0.2O7.9, using combined X-ray and neutron diffraction data, shows that its average structure is similar to that of β-ZrW2O8, with substitution occurring only at one of the W sites.
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access
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The solid solution in the system Zr–Mo–W–O with composition ZrW1.75Mo0.25O8 (zirconium tungsten molybdenum octaoxide) was prepared by solid-state reactions as a polycrystalline material. Its structure has cubic symmetry (space group P213) at room temperature. The structure contains a network of corner-sharing ZrO6 octahedra (.3. symmetry) and MO4 (M = W, Mo) tetrahedra (.3. symmetry). Along the main threefold axis of the cubic unit cell, the MO4 tetrahedra are arranged in pairs forming M2O8 units in which the M1O4 tetrahedra have larger distortions in terms of bond distances and angles than the M2O4 tetrahedra. These units are disordered over two possible orientations, with the M—Oterminal vectors pointing to the [111] or [![\overline{1}](//journals.iucr.org/e/issues/2009/05/00/wm2222//teximages/wm2222fi1.gif)
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] directions. The reversal of the orientations of the M2O8 units results from the concerted flips of these units. The time-averaged proportions of flipped and unflipped M2O8 units were determined and the fraction of unflipped M2O8 units is about 0.95. The order degree of the M2O8 unit orientation is about 0.9. During the reversal process, the M-atom site has a migration about 0.93 Å, one of the O-atom sites has a 0.25 Å migration distance, whereas two other O-atom sites migrate marginally (≃ 0.08 Å). The results prove the constraint strategy to be a reasonable approach based on the ratcheting mechanism.
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![a logo](https://journals.iucr.org/logos/jicons/a_36x36.png)
![e logo](https://journals.iucr.org/logos/jicons/e_36x36.png)
The title compound, [Zn(C8H4N4O2)]n, is a coordination polymer prepared by the hydrothermal reaction of zinc chloride and 3-(1H-tetrazol-5-yl)benzoic acid. The zinc cation is tetrahedrally coordinated by two N atoms and two O atoms from four ligands, resulting in a three-dimensional framework encapsulating one-dimensional channels.
![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
A cadmium(II) complex, prepared by reaction of Cd(NO3)2·6H2O with 5-nitrobenzene-1,3-dicarboxylic acid and 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene in H2O, possesses a twofold interpenetrating 3,5-connected network with the {42.65.83}{42.6} topology. The compound exhibits fluorescence emissions in the solid state at room temperature.
![e logo](https://journals.iucr.org/logos/jicons/e_36x36.png)
The reaction of terephthalonitrile and sodium azide catalyzed by manganese chloride tetrahydrate converts one nitrile group to tetrazole and leaves the other nitrile group unchanged. The MnII atom in the title compound, [Mn(H2O)6](C8H4N5)2, is coordinated by six water molecules and lies on a position of 2/m crystallographic symmetry. The plane of the tetrazolate anion is perpendicular to a crystallographic mirror plane.
![e logo](https://journals.iucr.org/logos/jicons/e_36x36.png)
The hydrothermal reaction of manganese chloride tetrahydrate and 5,5'-(1,4-phenylene)bis(1H-tetrazole) gave the title compound, [Mn(H2O)6](C8H4N8). In the molecule, the MnII atom is octahedrally coordinated by six water molecules and is located on an inversion center. The centrosymmetric tetrazolate anion remains unligated and links to water via hydrogen bonds.
![j logo](https://journals.iucr.org/logos/jicons/j_36x36.png)
A methodological framework for iterative projection algorithms called the half-cycle multigrid alleviates the twin-image problem in phase retrieval for coherent diffraction imaging using the multigrid method.
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The crystal structure of polymeric diaqua-8-hydroxyquinolinyl-5-sulfonatozinc(II) consists of a centrosymmetric (C9H5NO4S)2(H2O)2Zn2 entity which is linked into a network structure by intermolecular sulfonyl bridges. The network is further consolidated by hydrogen bonds involving the coordinated water molecules.
![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
A cadmium(II) compound, prepared by reaction of Cd(NO3)2·6H2O with benzene-1,4-diacetic acid and bis[4-(2-methylimidazol-1-yl)phenyl]methanone in a mixture of H2O and dimethylformamide, possesses a new three-dimensional pillar–layer framework based on CdII–PBEA layers and MIPMO pillars, which can be simplified into a pcu topological network. The title compound displays a highly selective and sensitive sensing for Fe3+ ions in aqueous solution. In addition, it displays a high photocatalytic activity for the degradation of methylene blue (MB) in water under UV light irradiation.
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In the title compound, [Cd(C8H3O7S)(C6H13N2)(H2O)]n, the Cd atom is coordinated by one O atom of a carboxylate group of a 5-sulfatoisophthalato ligand, two O atoms of the carboxylate group group of an adjacent symmetry-related 5-sulfoisophthalato entity, one O atom of the sulfonyl group of yet another adjacent 5-sulfatooisophthalato entity, a water molecule and the N atom of the 1-aza-4-azoniabicyclo[2.2.2]octane cation in a six-coordinate octahedral geometry. Thus, the mode of coordination of the 5-sulfatoisophthalato ligand leads to the formation of a linear ribbon motif; adjacent ribbons are linked by hydrogen-bonding interactions, giving rise to a three-dimensional network structure.
![e logo](https://journals.iucr.org/logos/jicons/e_36x36.png)
The Cu atom in [Cu(C10H8N2)2(H2O)4](C12H6O4)·3H2O exists in a trans-N2O4 octahedral coordination polyhedron that is formed by the N atoms of two 4,4'-bipyridine heterocycles and the O atoms of four water molecules. The carboxylate groups of the centrosymmetric anions interact indirectly with the Cu atoms through the coordinated water molecules. The cations and anions are linked by hydrogen bonds into a network motif. The Cu atom lies at a site of 2 symmetry.
![e logo](https://journals.iucr.org/logos/jicons/e_36x36.png)
The title crystal structure, {Na2[Cd2(C12H10N2)(C8H3O7S)2]·6H2O}n, contains pentagonal–bipyramidal Cd atoms and octahedral Na atoms. The Cd atom is chelated by two carboxyl groups of adjacent 5-sulfoisophthalate(3−) trianions, and it is also coordinated by the pyridyl group of the centrosymmetric heterocycle, the coordinating atoms comprising the pentagonal plane around the metal atom. In the network structure, the Na atoms occupy the voids in the network such that they exist in a six-coordinate geometry.
![f logo](https://journals.iucr.org/logos/jicons/f_36x36.png)
To investigate the mechanism by which P58(IPK) functions to promote protein folding within the ER, a P58(IPK) TPR fragment without the C-terminal J-domain has been crystallized.
![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
The title compound, [Cd(C8H7N4O2)2]n, crystallizes in the centrosymmetric triclinic space group P
with an asymmetric unit consisting of a bivalent CdII atom and two 2-(2,2'-bi-1H-imidazol-1-yl)acetate (BDAC-) anions. Two inversion-related BDAC- ligands are oppositely arranged and bind two CdII ions to form a [Cd2(BDAC)2] rhomboid subunit which is bridged by another BDAC- ligand to form an infinite ladder along the a direction containing parallelogram grids. The three-dimensional supramolecular architecture is formed by hydrogen bonds and C-H![...](/logos/entities/ctdot_rmgif.gif)
and
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interactions.
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In the title mixed-ligand metal-organic polymeric complex [Cd(C14H8O6S)(C16H16N2)(H2O)]n, the asymmetric unit contains a crystallographically unique CdII atom, one doubly deprotonated 4,4'-sulfonyldibenzoic acid ligand (H2SDBA), one 3,4,7,8-tetramethyl-1,10-phenanthroline (TMPHEN) molecule and one water molecule. Each CdII centre is coordinated by two N atoms from the chelating TMPHEN ligand, three O atoms from monodentate carboxylate groups of three different SDBA2- ligands and one O atom from a coordinated water molecule, giving a distorted CdN2O4 octahedral geometry. Single-crystal X-ray diffraction analysis reveals that the compound is a one-dimensional double-chain polymer containing 28-membered rings based on Cd2O2 clusters, with a Cd
Cd separation of 3.6889 (4) Å. These chains are linked by O-H
O and C-H
O hydrogen bonds to form a three-dimensional supramolecular framework. The framework is reinforced by
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and C-O![...](/logos/entities/ctdot_rmgif.gif)
interactions.
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