Chang-Sheng Gu

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.

Poly[aqua­(μ2-oxalato)(4-oxidopyri­din­ium)erbium(II)]

The title complex, [Er(C5H5NO)(C2O4)(H2O)]n, is a new erbium polymer based on oxalate and 4-oxidopyridinium ligands. The ErII center is coordinated by six O atoms from three oxalate ligands, one O atom from a 4-oxidopyridinium ligand and one water molecule, and displays a distorted square-antiprismatic coordination geometry. The oxalate ligands are both chelating and bridging, and link ErII ions, forming Er–oxalate layers in which the attached water and 4-oxidopyridinium units point alternately up and down. A mirror plane passes through the Er atom, one C, the oxide O and two oxalate O atoms. The layers are assembled into a three-dimensional supramolecular network via intermolecular hydrogen bonding and π–π stacking interactions [centroid–centroid distances of 3.587 (2) Å between parallel pyridinium rings]. Both the water molecule and the 4-oxidopyridinium ligand are disordered over two sites in a 1:1 ratio.

Bis­(1H-benzimidazole-κN3)bis(4-methyl­benzoato-κ2O,O′)cobalt(II)

In the title mononuclear complex, [Co(C8H7O2)2(C7H6N2)2], the CoII atom is coordinated by four carboxylate O atoms from two 4-methylbenzoate ligands and two N atoms from two benzimidazole ligands in an octahedral coordination geometry. The molecules are assembled via intermolecular N—H⋯O hydrogen-bonding interactions into a three-dimensional network.

Bis­(1H-benzimidazole-κN 3)bis(4-methyl­benzoato-κ 2 O,O′)cobalt(II)

In the title mononuclear complex, [Co(C8H7O2)2(C7H6N2)2], the CoII atom is coordinated by four carboxylate O atoms from two 4-methylbenzoate ligands and two N atoms from two benzimidazole ligands in an octahedral coordination geometry. The molecules are assembled via intermolecular N—H⋯O hydrogen-bonding interactions into a three-dimensional network.

Poly[aqua­(μ2-oxalato)(4-oxidopyri­din­ium)erbium(II)]. Corrigendum

Corrigendum to Acta Cryst. (2008), E64, m649–m650.

Poly[aqua(μ2-oxalato)(4-oxidopyridinium)erbium(II)]. Corrigendum

Corrigendum to Acta Cryst. (2008), E64, m649–m650.