43 research outputs found
A redetermination of bis(5,5′-diethylbarbiturato)bis(imidazole)cobalt(II)
The title complex, [Co(C8H12N2O3)2(C3H4N2)2], whose structure was first determined by Wang & Craven [(1971). J. Chem. Soc. D, pp. 290–291], has been redetermined with improved precision. A crystallographic twofold rotation axis passes through the Co atom, which is tetrahedrally coordinated by two N atoms from two barbital ligands and two N atoms from two imidazole ligands. The molecules are self-assembled via intermolecular N—H⋯O hydrogen-bonding interactions into a supramolecular network
Aquabis(1H-imidazole-κN 3)bis(4-methylbenzoato)-κO;κO,O′-nickel(II)
In the mononuclear title compound, [Ni(C8H7O2)2(C3H4N2)2(H2O)], the NiII atom is coordinated by three carboxylate O atoms (from a bidentate 4-methylbenzoate ligand and a monodentate 4-methylbenzoate ligand), two N atoms (from two imidazole ligands) and a water molecule in an octahedral geometry. Intermolecular O—H⋯O hydrogen-bonding interactions lead to infinite chains, which are further self-assembled into a supramolecular network through intermolecular N—H⋯O hydrogen-bonding interactions and π–π stacking [centroid–centroid distance = 3.717 (2) Å]
Poly[[μ2-aqua-aqua(μ3-3,5-dinitrosalicylato)barium(II)] monohydrate]
In the title coordination polymer, {[Ba(C7H2N2O7)(H2O)2]·H2O}n, the BaII atom is ten-coordinated by seven O atoms from four 3,5-dinitrosalicylatate ligands, two μ2-bridging aqua ligands and one water molecule. The coordination mode is best described as a bicapped square-antiprismatic geometry. The 3,5-dinitrosalicylatate ligands bridge three Ba atoms. Centrosymmetrically related dinuclear barium units, with a Ba⋯Ba separation of 4.767 (5) Å, form infinite chains, which are further self-assembled into a supramolecular network through intermolecular O—H⋯O hydrogen-bonding interactions between O atoms of 3,5-dinitrosalicylatate ligands and water molecules
Diaquabis(5-carboxy-2-propyl-1H-imidazole-4-carboxylato-κ2 N 3,O 4)nickel(II) tetrahydrate
In the title complex, [Ni(C8H9N2O4)2(H2O)2]·4H2O, the NiII ion is coordinated in a slightly distorted octahedral environment formed by two bis-chelating H2pimda (H3pimda is 2-propyl-1H-4,5-dicarboxylic acid) ligands and two coordinated water molecules. In the crystal structure, a three-dimensional framework is formed by intermolecular O—H⋯O and N—H⋯O hydrogen bonds involving the solvent water molecules, coordinated water molecules, carboxylate O atoms and the protonated N atoms of the H2pimda ligands. The propyl groups of each H2pimda ligand are disordered over two sets of sites with refined occupancies of 0.50 (2):0.50 (2) and 0.762 (11):0.238 (11). In one water solvent molecule, one of the H atoms was refined as disordered over two sites of equal occupancy
A Series of New Three-Dimensional d–f Heterometallic Coordination Polymers with Rare 10-Connected <b>bct</b> Net Topology Based on Planar Hexanuclear Heterometallic Second Building Units
A series of new three-dimensional (3D) d–f heterometallic
coordination polymers, namely, [LnM(μ<sub>5</sub>-PyIDC)(μ<sub>2</sub>-INIC)(μ<sub>3</sub>-INIC)]·<i>x</i>H<sub>2</sub>O [Ln = Sm, M = Co, <i>x</i> = 3 (<b>1</b>); Ln = Sm, M = Ni, <i>x</i> = 1 (<b>2</b>); Ln =
Eu, M = Co, <i>x</i> = 3 (<b>3</b>); Ln = Eu, M =
Cd, <i>x</i> = 3 (<b>4</b>); Ln = Eu, M = Zn, <i>x</i> = 3 (<b>5</b>); Ln = Gd, M = Co, <i>x</i> = 3 (<b>6</b>); Ln = Gd, M = Cd, <i>x</i> = 3 (<b>7</b>); Ln = Tb, M = Co, <i>x</i> = 3 (<b>8</b>); Ln = Tb, M = Cd, <i>x</i> = 2 (<b>9</b>); Ln =
Tb, M = Zn, <i>x</i> = 3 (<b>10</b>); H<sub>3</sub>PyIDC = 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid; HINIC
= isonicotinic acid], have been successfully synthesized under hydrothermal
conditions and structurally characterized. All the complexes are isostructural
and exhibit novel 3D pillar-layered coordination frameworks constructed
by the linkages of 2D heterometallic layers and INIC<sup>–</sup> pillars. Topological analysis indicates that those complexes possess
a rare uninodal 10-connected <b>bct</b> topology based on planar
hexanuclear heterometallic [Ln<sub>2</sub>M<sub>4</sub>(PyIDC)<sub>2</sub>] second building units. To the best of our knowledge, complexes <b>1</b>–<b>10</b> represent examples of 3D lanthanide–transition
heterometal–organic coordination polymers with highly connected <b>bct</b> networks. Moreover, the luminescence properties of complexes <b>3</b>–<b>5</b> and <b>7</b>–<b>10</b> and the magnetic properties of <b>6</b>–<b>8</b> were also investigated
Assembly of Chiral/Achiral Coordination Polymers Based on 2-(Pyridine-3-yl)-1H-4,5-imidazoledicarboxylic Acid: Chirality Transfer between Chiral Two-Dimensional Networks Containing Helical Chains
Three kinds of new coordination polymers, [Mn(μ<sub>3</sub>-HPyIDC)(H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>1a</b> and <b>1b</b>), {[Cd<sub>3</sub>(μ<sub>4</sub>-PyIDC)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>]·H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>), and [Ca(μ<sub>4</sub>-HPyIDC)(H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>3a</b> and <b>3b</b>), were synthesized from the solvothermal
reactions of 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid (H<sub>3</sub>PyIDC) with the corresponding metal salts. Crystal structure
analysis showed that all coordination polymers were based on an analogical
chiral two-dimensional (2D) secondary building unit (SBU) containing
helical chains. The chirality of the 2D SBU was transferred to neighboring
2D SBUs via hydrogen bonds and coordination bonds in <b>1</b> and <b>3</b>, respectively, resulting in two homochiral frameworks.
When opposite chirality was transferred between neighboring 2D SBUs
via Cd(II) ions, an achiral framework was generated, resulting in
2D nets packed in alternating <i>P</i> and <i>M</i> chirality in compound <b>2</b>. Furthermore, compounds <b>1</b>, <b>2</b>, and <b>3</b> feature 2D (8<sup>2</sup>·10), 3D (6<sup>2</sup>·8<sup>2</sup>)(6<sup>2</sup>·8<sup>2</sup>·10<sup>2</sup>), and <b>cds</b> network topologies,
respectively. Circular dichroism (CD) measurements also confirmed
that the resulting crystals of <b>1</b> and <b>3</b> are
racemic mixtures. Compounds <b>2</b> and <b>3</b> showed
strong fluorescent emissions at room temperature
Assembly of Chiral/Achiral Coordination Polymers Based on 2-(Pyridine-3-yl)-1H-4,5-imidazoledicarboxylic Acid: Chirality Transfer between Chiral Two-Dimensional Networks Containing Helical Chains
Three kinds of new coordination polymers, [Mn(μ<sub>3</sub>-HPyIDC)(H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>1a</b> and <b>1b</b>), {[Cd<sub>3</sub>(μ<sub>4</sub>-PyIDC)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>]·H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>), and [Ca(μ<sub>4</sub>-HPyIDC)(H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>3a</b> and <b>3b</b>), were synthesized from the solvothermal
reactions of 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid (H<sub>3</sub>PyIDC) with the corresponding metal salts. Crystal structure
analysis showed that all coordination polymers were based on an analogical
chiral two-dimensional (2D) secondary building unit (SBU) containing
helical chains. The chirality of the 2D SBU was transferred to neighboring
2D SBUs via hydrogen bonds and coordination bonds in <b>1</b> and <b>3</b>, respectively, resulting in two homochiral frameworks.
When opposite chirality was transferred between neighboring 2D SBUs
via Cd(II) ions, an achiral framework was generated, resulting in
2D nets packed in alternating <i>P</i> and <i>M</i> chirality in compound <b>2</b>. Furthermore, compounds <b>1</b>, <b>2</b>, and <b>3</b> feature 2D (8<sup>2</sup>·10), 3D (6<sup>2</sup>·8<sup>2</sup>)(6<sup>2</sup>·8<sup>2</sup>·10<sup>2</sup>), and <b>cds</b> network topologies,
respectively. Circular dichroism (CD) measurements also confirmed
that the resulting crystals of <b>1</b> and <b>3</b> are
racemic mixtures. Compounds <b>2</b> and <b>3</b> showed
strong fluorescent emissions at room temperature
Construction of Ba(II) Coordination Polymers Based on Imidazole-Based Dicarboxylate Ligands: Structural Diversity Tuned by Alcohol Solvents
Four novel three-dimensional (3D) barium–organic
coordination
polymers formulated as [Ba(μ<sub>5</sub>-H<sub>2</sub>hmIDC)(μ<sub>2</sub>-H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>1</b>), [Ba(μ<sub>3</sub>-H<sub>3</sub>hmIDC)<sub>2</sub>(μ<sub>1</sub>-H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>2</b>), [Ba(μ<sub>5</sub>-H<sub>2</sub>hmIDC)(μ<sub>2</sub>-O<sub>2</sub>)<sub>0.5</sub>]<sub><i>n</i></sub> (<b>3</b>), and [Ba(μ<sub>3</sub>-H<sub>3</sub>hmIDC)(μ<sub>4</sub>-H<sub>3</sub>hmIDC)]<sub><i>n</i></sub> (<b>4</b>) were synthesized under the solvothermal conditions of 2-(hydroxymethyl)-1<i>H</i>-imidazole-4,5-dicarboxylic acid (H<sub>4</sub>hmIDC) with
BaCl<sub>2</sub>·2H<sub>2</sub>O using a combination of water
or dimethyl formamide (DMF) with various alcohol solvents (methanol,
ethanol, <i>n</i>-propanol, isopropanol, and <i>n</i>-butanol). Complex <b>1</b> is a 3D framework based on two-dimensional
secondary building units (SBUs) and μ<sub>5</sub>-H<sub>2</sub>hmIDC<sup>2–</sup> pillars. This complex contains a unique <b>alb</b> network topology with the Schläfli symbol (4<sup>5</sup>·6)<sub>2</sub>(4<sup>10</sup>·6<sup>14</sup>·8<sup>4</sup>). Complex <b>2</b> is a (3,10)-connected framework
with binuclear [Ba<sub>2</sub>(COO)<sub>2</sub>] SBUs as 10-connected
nodes and two types of μ<sub>3</sub>-H<sub>2</sub>hmIDC<sup>2–</sup> ligands as 3-connected nodes. Complex <b>3</b> is a 3D framework formed with one-dimensional (1D) SBUs and μ<sub>5</sub>-H<sub>2</sub>hmIDC linkers, wherein the unprecedented oxygen
molecules are coordinated using a linear-μ-η<sup>1</sup>:η<sup>1</sup>-peroxo fashion, showing (5,6)-connected network
topology with the Schläfli symbol (4<sup>6</sup>·5<sup>3</sup>·6)(4<sup>6</sup>·5<sup>4</sup>·6<sup>5</sup>). Complex <b>4</b> is a 3D framework based on 1D SBUs with
μ<sub>3</sub>-H<sub>3</sub>hmIDC and μ<sub>4</sub>-H<sub>3</sub>hmIDC as linkers. This complex exhibits a trinodal (3,4,7)-connected
3D framework with the Schläfli symbol (4<sup>2</sup>·6)(4<sup>3</sup>·6<sup>3</sup>)(4<sup>8</sup>·6<sup>11</sup>·8<sup>2</sup>). The results revealed that the alcohol solvent plays a subtle
yet essential role in the crystallization and construction of Ba(II)-organic
coordination frameworks with diverse 3D structures, although these
alcohol molecules do not appear in the frameworks
Construction of Ba(II) Coordination Polymers Based on Imidazole-Based Dicarboxylate Ligands: Structural Diversity Tuned by Alcohol Solvents
Four novel three-dimensional (3D) barium–organic
coordination
polymers formulated as [Ba(μ<sub>5</sub>-H<sub>2</sub>hmIDC)(μ<sub>2</sub>-H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>1</b>), [Ba(μ<sub>3</sub>-H<sub>3</sub>hmIDC)<sub>2</sub>(μ<sub>1</sub>-H<sub>2</sub>O)]<sub><i>n</i></sub> (<b>2</b>), [Ba(μ<sub>5</sub>-H<sub>2</sub>hmIDC)(μ<sub>2</sub>-O<sub>2</sub>)<sub>0.5</sub>]<sub><i>n</i></sub> (<b>3</b>), and [Ba(μ<sub>3</sub>-H<sub>3</sub>hmIDC)(μ<sub>4</sub>-H<sub>3</sub>hmIDC)]<sub><i>n</i></sub> (<b>4</b>) were synthesized under the solvothermal conditions of 2-(hydroxymethyl)-1<i>H</i>-imidazole-4,5-dicarboxylic acid (H<sub>4</sub>hmIDC) with
BaCl<sub>2</sub>·2H<sub>2</sub>O using a combination of water
or dimethyl formamide (DMF) with various alcohol solvents (methanol,
ethanol, <i>n</i>-propanol, isopropanol, and <i>n</i>-butanol). Complex <b>1</b> is a 3D framework based on two-dimensional
secondary building units (SBUs) and μ<sub>5</sub>-H<sub>2</sub>hmIDC<sup>2–</sup> pillars. This complex contains a unique <b>alb</b> network topology with the Schläfli symbol (4<sup>5</sup>·6)<sub>2</sub>(4<sup>10</sup>·6<sup>14</sup>·8<sup>4</sup>). Complex <b>2</b> is a (3,10)-connected framework
with binuclear [Ba<sub>2</sub>(COO)<sub>2</sub>] SBUs as 10-connected
nodes and two types of μ<sub>3</sub>-H<sub>2</sub>hmIDC<sup>2–</sup> ligands as 3-connected nodes. Complex <b>3</b> is a 3D framework formed with one-dimensional (1D) SBUs and μ<sub>5</sub>-H<sub>2</sub>hmIDC linkers, wherein the unprecedented oxygen
molecules are coordinated using a linear-μ-η<sup>1</sup>:η<sup>1</sup>-peroxo fashion, showing (5,6)-connected network
topology with the Schläfli symbol (4<sup>6</sup>·5<sup>3</sup>·6)(4<sup>6</sup>·5<sup>4</sup>·6<sup>5</sup>). Complex <b>4</b> is a 3D framework based on 1D SBUs with
μ<sub>3</sub>-H<sub>3</sub>hmIDC and μ<sub>4</sub>-H<sub>3</sub>hmIDC as linkers. This complex exhibits a trinodal (3,4,7)-connected
3D framework with the Schläfli symbol (4<sup>2</sup>·6)(4<sup>3</sup>·6<sup>3</sup>)(4<sup>8</sup>·6<sup>11</sup>·8<sup>2</sup>). The results revealed that the alcohol solvent plays a subtle
yet essential role in the crystallization and construction of Ba(II)-organic
coordination frameworks with diverse 3D structures, although these
alcohol molecules do not appear in the frameworks