Jing-Gui Zhao

3-Methoxy­salicyl­aldehyde 4-methoxy­benzoyl­hydrazone monohydrate

The title compound, C16H16N2O 4·H2O, crystallizes as a monohydrate in which the water molecule forms bifurcated hydrogen bonds to the hydroxyl and methoxy O atoms of the methoxysalicyldehyde portion of the Schiff base. The molecule is approximately planar; hydrogen-bonding interactions involving the amino group and the water molecule give rise to a layer structure.

Three-dimensional 3d-4f frameworks constructed through substituted imidazole-dicarboxylate: Synthesis, structure, and characterization

A heteronuclear metal organic framework containing erbium(III) and cobalt(II) ion based on a rigid ligand of substituted imidazoledicarboxylic acid has been synthesized and characterized by single-crystal X-ray diffraction analysis (CIF file CCDC no. 1019455). It’s formula is [Er2Co2(μ3-HMimda)2(μ3-Mimda)2 · 4H2O]n · 2nH2O, (H3Mimda = 1-H-2-methyl-4,5-imidazole-dicarboxylic acid). The complex crystallizes in the monoclinic system. It possesses an extended grid-like porous structure constructed from corrugated shaped 2D layer. Direct current magnetic susceptibility measurements for indicated the depopulation of the Stark components at low temperature and possible very weak antiferromagnetic interactions within heteronuclear MOF.

The one-dimensional polymer poly[[aqua­(2,2′-bipyridine)cadmium(II)]-μ-trans-stilbene-4,4′-dicarboxyl­ato]

In the title polymer, [Cd(C16H10O4)(C10H8N2)(H2O)]n, the CdII ion is in a strongly distorted octahedral geometry, being coordinated by two N atoms from a 2,2′-bipyridine ligand, three carboxylate O atoms from two symmetry-related trans-stilbene-4,4′-dicarboxylate dianions and one water molecule. The stilbene ligand lies on an inversion centre at the midpoint of the central C=C bond. This feature generates the polymeric structure: adjacent CdII ions are bridged by trans-stilbene-4,4′-dicarboxylate dianions, giving rise to a one-dimensional structure. The coordinated water molecule is involved in interchain O—H⋯O hydrogen bonds.

1-Carboxy­methyl-3-hydroxy­pyridinium chloride–3-hydroxy­pyridinium-1-acetate (1/1)

# 2004 International Union of Crystallography Printed in Great Britain ± all rights reserved In the crystal structure of the title 1:1 co-crystal, C7H8NO3 + Clÿ C7H7NO3, of 1-carboxymethyl-3-hydroxypyridinium chloride with 3-hydroxypyridinium-1-acetate, the cation interacts with the zwitterion to form a ribbon that runs along the c axis of the orthorhombic unit cell. The Clÿ anions lie at the sides of the ribbon.

Hexaaqua­manganese(II) bis[(4-oxo-4H-pyridin-1-yl)acetate] dihydrate

The title complex, [Mn(H2O)6](C7H6NO3)2·2H2O, was synthesized by the reaction of MnCl2·4H2O and (4-oxo-4H-pyrindin-1-yl)acetic acid in aqueous solution. The manganese(II) ion, which lies on a center of symmetry, is octahedrally coordinated by six water molecules [Mn—O = 2.166 (1)–2.177 (1) A]. A three-dimensional supramolecular framework is formed via O—H⋯O hydrogen bonds between the anions and cations.

Tetrakis(μ-acetato-κ2O:O′)­bis­[(4-pyridone-κO)copper(II)]

In the title centrosymmetric dinuclear complex, [Cu2(C2H3O2)4(C5H5NO)2], the two CuII atoms are bridged by four atetate groups, the Cu⋯Cu separation being 2.6468 (7) A. Each CuII atom exists in a square-pyramidal coordination environment defined by four carboxyl acetate O atoms and one 4-pyridone O atom. Intermolecular hydrogen bonds give rise to a two-dimensional layer structure.

Di­chloro­bis(4-pyridone-κO)­cobalt(II)

The Co atom in the title complex, [CoCl2(C5H5NO)2], has a distorted tetrahedral coordination involving two Cl− ions and two O atoms of two 4-pyridone ligands. The Co atom occupies a special position with twofold rotation symmetry. A layer structure is formed by N—H⋯Cl intermolecular hydrogen bonds and π–π stacking interactions of adjacent pyridone rings.