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Coordination Networks (coordination + network)
Kinds of Coordination Networks Selected AbstractsThe Catalytic Z to E Isomerization of Stilbenes in a Photosensitizing Porous Coordination Network,ANGEWANDTE CHEMIE, Issue 32 2010Kazuaki Ohara Einbahnreaktion: Die Z,E -Photoisomerisierung von Stilben durch sichtbares Licht geschieht in einem porösen Koordinationsnetzwerk (siehe Bild). Die Reaktion verläuft in einer Pore über die Photoanregung des Ladungstransfer-Komplexes zwischen einem elektronenarmen Liganden und dem Stilben. Das in,situ gebildete E -Isomer wird schnell gegen nicht umgesetztes Z -Isomer aus der Lösung ausgetauscht, daher genügt eine katalytische Menge des Netzwerkes, um die Reaktion voranzutreiben. [source] Molecular Tectonics: Design of 1-D Coordination Networks Based on Pyrene-Bearing Pyrazolyl UnitsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 1 2003Abdelaziz Jouaiti Abstract The synthesis of a new ligand based on a pyrene backbone bearing four pyrazolyl units is reported. Whereas this compound forms a discrete exo-binuclear complex with palladium, in the presence of silver a 1-D coordination network is obtained and structurally characterised in the solid state by X-ray diffraction method. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source] Molecular Tectonics at the Solid/Liquid Interface: Controlling the Nanoscale Geometry, Directionality, and Packing of 1D Coordination Networks on Graphite SurfacesADVANCED MATERIALS, Issue 10-11 2009Artur Ciesielski Supramolecular arrays composed of 1-D coordination networks on surfaces, with nanoscale control over both the geometry and the directionality, are achieved through the design and combination of organic tectons with metal complexes (CoCl2) or metal centers (Pd(BF4)2). Scanning tunneling microscope at the solid/liquid interface allows the visualization of long and shape-persistent arrays, with either linear or zig-zag geometries. [source] Regioselecitive Huisgen Cycloaddition within Porous Coordination Networks,ANGEWANDTE CHEMIE, Issue 13 2010Takehide Kawamichi Poren als Reaktionsräume: 1,3-Dipolare Huisgen-Cycloadditionen von 2-(Azidomethyl)triphenylen und Alkinen (siehe Schema) in einem porösen Koordinationsgerüst laufen als Einkristall-Einkristall-Umwandlungen ab. ,-Stapel und Nanoporen im Gerüst richten die Reaktionspartner so aus, dass das 1,4-substituierte Isomer des 1,2,3-Triazols selektiv als Produkt gebildet wird. [source] Synthesis and Properties of (Triptycenedicarboxylatio)zinc Coordination NetworksCHEMISTRY - A EUROPEAN JOURNAL, Issue 23 2009Sergei Abstract Paddle wheels and pillars: Layered 3D metal,organic frameworks comprised of paddle-wheel coordination units are constructed under a variety of conditions to incorporate bridging ligands (as illustrated) that impart desired properties, such as guest-exchange behavior, luminescence, microporosity, and stability, to the material. (Triptycenedicarboxylato)zinc metal,organic frameworks (MOFs) based on paddle wheel secondary building units (SBUs) with different axial ligands have been prepared. The reproducible formation of the layered paddle-wheel structures from triptycenedicarboxylic acid (H2TDC) and zinc nitrate under various conditions seems to be characteristic of this acid and is utilized for the construction of 3D frameworks by a pillaring approach. We attempted to bring additional functionalities into MOFs by employing the appropriate pillaring ligands, for example, bis(4-pyridyl)- s -tetrazine and bis(4-pyridyl)-dimethoxy- p -phenylenedivinylene, and investigated certain properties of some MOF materials, such as guest-exchange behavior, luminescence, microporosity, and stability. [source] Guest-Dependent Flexible Coordination Networks with Fluorinated LigandsCHEMISTRY - A EUROPEAN JOURNAL, Issue 11 2007Kayoko Kasai Dr. Abstract Guest-dependent flexible coordination networks are formed from 1,4-bis(4-pyridylmethyl)tetrafluorobenzene (bpf), 4,4,-bis(4-pyridylmethyl)octafluorobiphenyl (bpfb), 2,6-bis(4-pyridylmethyl)hexafluoronaphthalene (2,6-bpfn), and 2,7-bis(4-pyridylmethyl)hexafluoronaphthalene (2,7-bpfn) with Cd(NO3)2 in the presence of various organic compounds. The reaction of bpf affords one-dimensional cyclic chains, two-dimensional rhombus grid sheets, and three-dimensional diamond frameworks with threefold interpenetration. The reaction of bpfb mainly affords two-dimensional rhombus grid sheets with twofold parallel interpenetration. The reaction of 2,6-bpfn affords a one-dimensional ladder and two-dimensional rhombus grid, twisted grid, and herringbone sheets. The reaction of 2,7-bpfn affords two-dimensional rhombus grid sheets and grid sheets with dumbbell-shaped cavities. This diversity of network topologies is induced by interactions between the guest molecules and the flexible ligand frameworks. [source] Fluorous Pores in Coordination NetworksCHEMISTRY - AN ASIAN JOURNAL, Issue 10 2009Minsul Jang Fluorous nanophase in the pore: Perfluoroalkyl chain-anchored bridging ligands are assembled, upon complexation with Co(NCS)2, into coordination networks with fluorous pores that show fluorophilic/organophobic properties. The perfluoroalkyl chains are considerably disordered and seem to tumble in the pores, forming a nanoscopic pseudo liquid phase in the solid. [source] Synthesis, Crystal Structure and Photoluminescent Properties of Two Novel Two-dimensional Coordination Networks Assembled by Lanthanide Salts and Carboxylate Ligand,CHINESE JOURNAL OF CHEMISTRY, Issue 1 2009Yajuan LI Abstract Two novel two-dimensional (2D) lanthanide(III) coordination polymers [Ln(PDC)(OH)(H2O)2]n (Ln=Eu (1) and Tb (2), H2PDC=pyridine-3,4-dicarboxylic acid) have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR, TGA and single-crystal X-ray diffraction. Both compounds show the same 2D layer containing 1D Ln,O,Ln chains, and the layers are further connected through hydrogen-bonding as well as ,-, stacking interactions into a three-dimensional supramolecular network. Furthermore, both compounds exhibit intense fluorescent emission bands in the solid state at room temperature. [source] Thermal Decomposition Reactions as a Tool for the Synthesis of New Thermodynamic Metastable Modifications: Synthesis, Structures, and Properties of (Formato)nickel(II) Coordination Polymers Based on 4,4,-BipyridineEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 12 2010Jan Boeckmann Abstract The reaction of nickel formate with 4,4,-bipyridine (bipy) in aqueous solution at room temperature leads to the formation of the hydrated compound [Ni(HCO2)2(H2O)(bipy)·4H2O]n (1) reported recently. On heating, compound 1 decomposes into the new anhydrous compound of composition [Ni(HCO2)2(bipy)]n (2II), which decomposes on further heating. Interestingly, if the anhydrous compound is prepared from solution, a new modification 2I is obtained. Investigations on the stability of both forms show that modification 2I presents the thermodynamically most stable form between room and decomposition temperature, whereas modification 2II, which can only be prepared by thermal decomposition, is metastable. In the crystal structure of 2I, the Ni2+ cations are coordinated by four ,2 - anti,anti bridging formato anions and two bridging ,2 -bipy ligands in a slightly distorted octahedralgeometry. The formato anions bridge the metal cations in zigzag chains, which are further connected by ,2 - anti,anti formato anions and bipy ligands to give a three-dimensional coordination network. IR spectroscopic investigations on the metastable form 2II also indicate that all formato anions act as bridging ligands. Magnetic measurements of the hydrated and anhydrous compounds reveal different behavior with a ferromagnetic ordering for compound 2I and an antiferromagnetic ordering for compound 1. For form 2II, only Curie,Weiss paramagnetism was found. [source] ZnO Nanoparticles From a Metal-Organic Framework Containing ZnII MetallacyclesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 4 2007Harjyoti Thakuria Abstract Nitrilotriacetic acid (H3NTA) reacts in the solid phase with zinc hydroxide (1:1) to form a 3D ladder-like metal-organic framework that forms wurtzite ZnO nanoparticles when heated above 600 °C. Complex 1 contains a 1D zig-zag water chain. A mixed coordination network 2 is formed with excess ZnII hydroxide, which, on decomposition at about 500 °C, forms microwires of ZnO.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source] Molecular Tectonics: Design of 1-D Coordination Networks Based on Pyrene-Bearing Pyrazolyl UnitsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 1 2003Abdelaziz Jouaiti Abstract The synthesis of a new ligand based on a pyrene backbone bearing four pyrazolyl units is reported. Whereas this compound forms a discrete exo-binuclear complex with palladium, in the presence of silver a 1-D coordination network is obtained and structurally characterised in the solid state by X-ray diffraction method. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source] A bis(amine,carboxylate) copper(II) coordination compound forms a two-dimensional metal,organic framework when crystallized from water and methanolACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2009Orde Q. Munro When {2,2,-[(2-methyl-2-nitropropane-1,3-diyl)diimino]diacetato}copper(II), [Cu(C8H13N3O6)], (I), was crystallized from a binary mixture of methanol and water, a monoclinic two-dimensional water- and methanol-solvated metal,organic framework (MOF) structure, distinctly different from the known orthorhombic one-dimensional coordination polymer of (I), was isolated, namely catena -poly[[copper(II)-,3 -2,2,-[(2-methyl-2-nitropropane-1,3-diyl)diimino]diacetato] methanol 0.45-solvate 0.55-hydrate], {[Cu(C8H13N3O6)]·0.45CH3OH·0.55H2O}n, (II). The monoclinic structure of (II) comprises centrosymmetric dimers stabilized by a dative covalent Cu2O2 core and intramolecular N,H...O hydrogen bonds. Each dimer is linked to four neighbouring dimers via symmetry-related (opposing) pairs of bridging carboxylate O atoms to generate a `diamondoid' net or two-dimensional coordination network. Tight voids of 166,Å3 are located between these two-dimensional MOF sheets and contain a mixture of water and methanol with fractional occupancies of 0.55 and 0.45, respectively. The two-dimensional MOF sheets have nanometre-scale spacings (11.2,Å) in the crystal structure. Hydrogen-bonding between the methanol/water hydroxy groups and a Cu-bound bridging carboxylate O atom apparently negates thermal desolvation of the structure below 358,K in an uncrushed crystal of (II). [source] A unique two-dimensional coordination network of 1-benzofuran-2,3-dicarboxylate with lanthanum(III) obtained by solvothermal synthesisACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2009Rajesh Koner The title compound, poly[bis[diaqualanthanum(III)]-tris(,-1-benzofuran-2,3-dicarboxylato)], [La2(C10H4O5)3(H2O)4]n, was obtained under solvothermal conditions by reacting lanthanum trinitrate hexahydrate with 1-benzofuran-2,3-dicarboxylic acid in a strongly basic environment. It forms an extended two-dimensional coordination network, wherein every lanthanum ion links to four deprotonated diacid ligands, while two of the latter bridge between adjacent metal cations. The component species are additionally linked to one another by hydrogen bonds. The polymeric arrays are tightly stacked one on top of the other, without incorporating any solvent in the interface zones between them, which are lined with the lipophilic benzofuran residues. This study provides the first example of coordination networking with the aid of the 1-benzofuran-2,3-dicarboxylate ligand. [source] Poly[[hexaaquabis[,4 -2-hydroxy-5-(4-sulfonatophenyldiazenyl)benzoato]dibarium(II)] 4,4,-bipyridine solvate]ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2007Hong Liu The title compound, {[Ba2(C13H8N2O6S)2(H2O)6]·C10H8N2}n, possesses a novel two-dimensional porous coordination network, in which each BaII ion is nine-coordinated by three carboxylate O atoms, two sulfonate O atoms and four water molecules in an irregular coordination environment. Hydrogen-bond interactions between coordinated water molecules and sulfonate/hydroxyl groups hold the network layers together and produce a three-dimensional supramolecular architecture. [source] Pyrolysis of a Three-Dimensional MnII/MnIII Network To Give a Multifunctional Porous Manganese Oxide MaterialCHEMISTRY - A EUROPEAN JOURNAL, Issue 4 2010Sanjit Nayak Dr. Pores for thought! Thermolysis of a 3D coordination network of MnII/MnIII produces a novel spongelike morphology of manganese oxide by a degassing mechanism (see picture). This porous material shows high capacitance when used as an anode in a Li-ion battery and efficient catalytic activity for cyclohexene oxidation. [source] Entrapment of a Hexamer of Nitrobenzene Molecules between the Layers of (4,4)-Coordination Networks Containing Intra-,-Sheet Hydrogen BondsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 3 2006Madhushree Sarkar Abstract Two exo -bidentate pyridyl ligands containing diamides as spacers were shown to form non-interpenetrated 2D-coordination networks of (4,4)-geometry upon treatment with Cu(NO3)2 and NaSCN. The crystal structures reveal that both structures contain intralayer ,-sheet hydrogen bonds. In one of these structures nitrobenzene occupies 60,% of the crystal volume included between the coordination networks. The nitrobenzene molecules form a layer which has the hexameric C,H···O hydrogen bonded aggregate as a basic building block. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] Molecular Tectonics at the Solid/Liquid Interface: Controlling the Nanoscale Geometry, Directionality, and Packing of 1D Coordination Networks on Graphite SurfacesADVANCED MATERIALS, Issue 10-11 2009Artur Ciesielski Supramolecular arrays composed of 1-D coordination networks on surfaces, with nanoscale control over both the geometry and the directionality, are achieved through the design and combination of organic tectons with metal complexes (CoCl2) or metal centers (Pd(BF4)2). Scanning tunneling microscope at the solid/liquid interface allows the visualization of long and shape-persistent arrays, with either linear or zig-zag geometries. [source] Two two-dimensional hydrogen-bonded coordination networks: bis(3-carboxybenzoato-,O)bis(4-methyl-1H -imidazole-,N3)copper(II) and bis(3-methylbenzoato-,N)bis(4-methyl-1H -imidazole-,N3)copper(II) monohydrateACTA CRYSTALLOGRAPHICA SECTION C, Issue 12 2009Ziliang Wang The title two-dimensional hydrogen-bonded coordination compounds, [Cu(C8H5O4)2(C4H6N2)2], (I), and [Cu(C8H7O2)2(C4H6N2)2]·H2O, (II), have been synthesized and structurally characterized. The molecule of complex (I) lies across an inversion centre, and the Cu2+ ion is coordinated by two N atoms from two 4-methyl-1H -imidazole (4-MeIM) molecules and two O atoms from two 3-carboxybenzoate (HBDC,) anions in a square-planar geometry. Adjacent molecules are linked through intermolecular N,H...O and O,H...O hydrogen bonds into a two-dimensional sheet with (4,4) topology. In the asymmetric part of the unit cell of (II) there are two symmetry-independent molecules, in which each Cu2+ ion is also coordinated by two N atoms from two 4-MeIM molecules and two O atoms from two 3-methylbenzoate (3-MeBC,) anions in a square-planar coordination. Two neutral complex molecules are held together via N,H...O(carboxylate) hydrogen bonds to generate a dimeric pair, which is further linked via discrete water molecules into a two-dimensional network with the Schläfli symbol (43)2(46,66,83). In both compounds, as well as the strong intermolecular hydrogen bonds, ,,, interactions also stabilize the crystal stacking. [source] Square-grid coordination networks of (5,10,15,20-tetra-4-pyridylporphyrinato)zinc(II) in its clathrate with two guest molecules of 1,2-dichlorobenzene: supramolecular isomerism of the porphyrin self-assemblyACTA CRYSTALLOGRAPHICA SECTION C, Issue 3 2009Rajesh Koner The title compound, (5,10,15,20-tetra-4-pyridylporphyrinato)zinc(II) 1,2-dichlorobenzene disolvate, [Zn(C40H24N8)]·2C6H4Cl2, contains a clathrate-type structure. It is composed of two-dimensional square-grid coordination networks of the self-assembled porphyrin moiety, which are stacked one on top of the other in a parallel manner. The interporphyrin cavities of the overlapping networks combine into channel voids accommodated by the dichlorobenzene solvent. Molecules of the porphyrin complex are located on crystallographic inversion centres. The observed two-dimensional assembly mode of the porphyrin units represents a supramolecular isomer of the unique three-dimensional coordination frameworks of the same porphyrin building block observed earlier. The significance of this study lies in the discovery of an additional supramolecular isomer of the rarely observed structures of metalloporphyrins self-assembled directly into extended coordination polymers without the use of external ligand or metal ion auxiliaries. [source] Square-grid coordination networks of diaquabis(4,4,-bipyridyl)copper(II) crosslinked by hydrogen bonds through two monoanions of 1-benzofuran-2,3-dicarboxylic acid and five molecules of waterACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2009Rajesh Koner The title compound, poly[[[diaquacopper(II)]-di-,-4,4,-bipyridyl] bis(3-carboxy-1-benzofuran-2-carboxylate) pentahydrate], {[Cu(C10H8N2)2(H2O)2](C10H5O5)2·5H2O}n, crystallizes in a single-framework architecture. It is composed of two-dimensional square-grid coordination networks of 1:2:2 copper,4,4,-bipyridine,water units, wherein each copper ion coordinates equatorially to four bipyridyl units and axially to two water ligands. The polymeric nets are intercalated by layers of the benzofurandicarboxylic acid monoanions and additional water species. An extensive array of hydrogen bonds interlinks the various components of the structure. The Cu atom and the bipyridyl entities are located on axes of twofold rotation. This study confirms the preferred monoanionic nature of the benzofurandicarboxylic acid molecule. It reveals a rarely observed extended coordination polymer composed only of copper ions and bipyridyl linkers, and an interesting hydrogen-bonding connectivity between the polymeric layers aided by the benzofurandicarboxylic acid and water components intercalated in the structure. [source] Switching On Luminescence in Nucleotide/Lanthanide Coordination Nanoparticles via Synergistic Interactions with a Cofactor LigandCHEMISTRY - A EUROPEAN JOURNAL, Issue 12 2010Carole Aimé Dr. Coordination nanoparticles: Hydroxypicolinic acid (1) is easily incorporated into coordination nanoparticles (CNPs) self-assembled from nucleotides and terbium ions without impairing nanoparticle morphology. Compound 1 acts as a cofactor ligand that coordinates to Tb3+ ions that exist in the coordination networks, and this switches on the luminescence of CNPs (see graphic). [source] Guest-Dependent Flexible Coordination Networks with Fluorinated LigandsCHEMISTRY - A EUROPEAN JOURNAL, Issue 11 2007Kayoko Kasai Dr. Abstract Guest-dependent flexible coordination networks are formed from 1,4-bis(4-pyridylmethyl)tetrafluorobenzene (bpf), 4,4,-bis(4-pyridylmethyl)octafluorobiphenyl (bpfb), 2,6-bis(4-pyridylmethyl)hexafluoronaphthalene (2,6-bpfn), and 2,7-bis(4-pyridylmethyl)hexafluoronaphthalene (2,7-bpfn) with Cd(NO3)2 in the presence of various organic compounds. The reaction of bpf affords one-dimensional cyclic chains, two-dimensional rhombus grid sheets, and three-dimensional diamond frameworks with threefold interpenetration. The reaction of bpfb mainly affords two-dimensional rhombus grid sheets with twofold parallel interpenetration. The reaction of 2,6-bpfn affords a one-dimensional ladder and two-dimensional rhombus grid, twisted grid, and herringbone sheets. The reaction of 2,7-bpfn affords two-dimensional rhombus grid sheets and grid sheets with dumbbell-shaped cavities. This diversity of network topologies is induced by interactions between the guest molecules and the flexible ligand frameworks. [source] Fluorous Pores in Coordination NetworksCHEMISTRY - AN ASIAN JOURNAL, Issue 10 2009Minsul Jang Fluorous nanophase in the pore: Perfluoroalkyl chain-anchored bridging ligands are assembled, upon complexation with Co(NCS)2, into coordination networks with fluorous pores that show fluorophilic/organophobic properties. The perfluoroalkyl chains are considerably disordered and seem to tumble in the pores, forming a nanoscopic pseudo liquid phase in the solid. [source] | ||||||||||