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metal-organic compounds
The structure of the title compound, {[La(C6H4NO2)2(H2O)4](NO3)}n, consists of an infinite cationic chain, [La(C6H4NO2)2(H2O)4]+, and well separated (NO3)− anions. The LaIII atom is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules. The coordination geometry around the La centre can be described as a distorted square antiprism. The La atoms are bridged by two carboxylate groups of two isonicotinate ligands to form an infinite chain along the c direction. The carboxylate-bridged chains are linked to each other via hydrogen bonds between pyridyl N atoms and coordinated water molecules to form a three-dimensional network with channels in which the nitrate anions are located, and the intermolecular hydrogen bonds are formed between the nitrate anions and cationic chains.
metal-organic compounds
The new molecular metal chalcogenide, (enH)[Ni(en)3][SbSe4] or (C2H9N2)[Ni(C2H8N2)3][SbSe4], has been synthesized by a solvothermal reaction in an ethylenediamine/methanol solution at 443 K. The structure contains tetrahedral SbSe43- anions and octahedral [Ni(en)3]2+ cations, as well as the monoprotonated ethylenediamine cation [enH]+.
metal-organic compounds
The structure of the title compound, [EuFe(CN)6(DMF)4(H2O)3]·H2O (DMF is dimethylformamide), is comprised of a neutral bimetallic complex EuFe(CN)6(DMF)4(H2O)3 and a solvent water molecule. Approximately octahedral sixfold-coordinated FeIII and a slightly distorted square-antiprismatic eightfold-coordinated EuIII ions are bridged by a cyanide group to form a dinuclear complex. A three-dimensional framework is formed through O—H
N and O—HO hydrogen-bonding interactions.
N and O—HO hydrogen-bonding interactions. metal-organic compounds
The title compound, [Cu(C8H4O4)(C5H5N)2(H2O)]n·0.25nH2O, was obtained unintentionally as the product of an attempted synthesis of a 4-cyanobenzoate-bridged network complex of copper(II) using pyridine as a base to deprotonate the organic acid. Its crystal structure is built up by one-dimensional helical chains along the c direction and uncoordinated water molecules through intermolecular O—HO hydrogen bonds and van der Waals interactions. The investigated crystal was a partial inversion twin.
O hydrogen bonds and van der Waals interactions. The investigated crystal was a partial inversion twin.metal-organic compounds
Reaction of pyrazine-2,3-dicarboxylic acid, NaOH, KSCN and Cu(NO3)2·3H2O led to the formation of Na2K2[trans-Cu(C6H2N2O4)2](SCN)2·2H2O, in which the CuII atom, on an inversion centre, is approximately in a square-planar environment. This is a new coordination geometry for copper in complexes of pyrazine-2,3-dicarboxylate.
metal-organic compounds
The title compound, {[Mn3(C6H3O6)2(H2O)6]·0.2H2O}n, contains a three-dimensional open framework formed by each organic ligand μ3-bridging three six-coordinated MnII atoms (one of which resides on a twofold crystallographic axis). Uncoordinated water molecules are located in the channels of the framework along the c-axis direction. The primary O—HO intermolecular interactions have OO distances ranging from 2.680 (4) to 3.020 (13) Å and O—HO angles ranging from 125 (4) to 179 (4)°.
O intermolecular interactions have OO distances ranging from 2.680 (4) to 3.020 (13) Å and O—HO angles ranging from 125 (4) to 179 (4)°.metal-organic compoundsOpen 
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In the structure of the title compound, {[Sm(C6H4NO2)2(H2O)4]Cl}n, the unique SmIII atom lies on a crystallographic twofold axis and is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules in a slightly distorted square-antiprismatic coodination environment. The SmIII atoms are bridged by two carboxylate groups of two isonicotinate ligands, forming an extended chain along the c-axis direction. These chains are cross-linked through hydrogen bonds, forming a three-dimensional framework, with channels which accommodate the chloride anions.
metal-organic compounds
In the title compound, [Fe(C7H3NO5)Cl(H2O)2]·C12H24O6·2H2O or [Fe(HChel)Cl(H2O)2].(18-crown-6)·2H2O, where H3Chel is 4-hydroxypyridine-2,6-dicarboxylic (chelidamic) acid, the FeIII atom exhibits a distorted octahedral geometry coordinated by two O atoms and one N atom from the tridentate chelidamate ligand, one Cl atom and two water molecules. O—HO hydrogen bonds from the coordinated water molecules to the O atoms of the crown ether form one-dimensional hydrogen-bonded chains with alternating [Fe(HChel)Cl(H2O)2] and 18-crown-6 units. The solvent water molecules lie between these chains, accepting O—HO hydrogen bonds from the hydroxyl groups of the chelidamate ligands, and forming O—HO hydrogen bonds with the noncoordinated O atoms of the carboxylate groups.
O hydrogen bonds from the coordinated water molecules to the O atoms of the crown ether form one-dimensional hydrogen-bonded chains with alternating [Fe(HChel)Cl(H2O)2] and 18-crown-6 units. The solvent water molecules lie between these chains, accepting O—HO hydrogen bonds from the hydroxyl groups of the chelidamate ligands, and forming O—HO hydrogen bonds with the noncoordinated O atoms of the carboxylate groups.metal-organic compounds
The title compound, [Zn(C7H2NO5)(H2O)3]·0.25CH3CN·H2O, was synthesized by the reaction of Zn(CH3COO)2·2H2O and chelidamic acid. The coordination geometry of the Zn atom is a distorted octahedron, with one N and two O atoms from the chelidamate ligand and three water O atoms. A three-dimensional network is formed by the O—HO hydrogen bonds between the O atoms of the chelidamate ligand and the aqua ligands and water molecule of crystallization.
O hydrogen bonds between the O atoms of the chelidamate ligand and the aqua ligands and water molecule of crystallization.
