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In the title compound, [Cd(C9H6NO2S2)(C12H8N2)2(H2O)]NO3·H2O, the Cd atom is coordinated by four N atoms [Cd—N = 2.376 (3)–2.394 (3)A] and two O atoms [Cd—O = 2.240 (2)–2.274 (3)A] in a distorted octa­hedral geometry. The crystal structure exhibits inter­molecular O—H⋯O hydrogen bonds and π–π stacking inter­actions.

In the title complex, diaqua­bis(2-amino-3-methyl­butyrato-κ2N,O)nickel(II), [Ni(C5H10NO2)2(H2O)2], the NiII atom (site symmetry 2) is octa­hedrally coordinated by two N,O-bidenate valinate ions and two water mol­ecules. A network of inter­molecular hydrogen bonds links the complex mol­ecules into a two-dimensional network.

Polymeric di­chloro(N,N-di­methyl­ethyl­enedi­amine)­cad­mium­(II), [CdCl2(C4H12N2)]n, has been synthesized and characterized by single-crystal X-ray diffraction. The two-dimensional polymeric sheet structure involves 12-membered zigzag rings formed by chloro bridges.

In the title complex, [Co(C5H5N2O3)2(H2O)2]·2H2O, the CoII ion is octa­hedrally coordinated by two O,N-bidentate 6-oxo-1,4,5,6-tetra­hydro­pyridazine-3-carboxyl­ate ions and two water mol­ecules. The complex mol­ecule is centrosymmetric, with the CoII ion located on an inversion center.

In the title compound, [Pb(C7H4O3)]n, the PbII atom is coordinated by five O atoms from four salicylic acid ligands with Pb—O distances of 2.318 (16)–2.605 (15) A. Each ligand acts in a penta­dentate mode that leads to the formation of a two-dimensional polymeric network.

In the title complex, [CoCl2(C13H11N3O2)2(H2O)2]·2H2O, each CoII atom occupies an inversion center and is coordinated by two water mol­ecules, two Cl− anions and two N-benzoyl-N′-(isonicotino­yl)hydrazine ligands in a distorted octa­hedral geometry. The asymmetric unit contains two half-complexes. The three-dimensional supra­molecular architecture is stabilized by inter­molecular hydrogen bonding.

In the title complex, [Ni(C28H20Cl2N2O2)], the NiII atom exists in a square-planar environment, coordinated by four atoms from the tetradentate ligand. Molecules are held together by intermolecular C—H⋯O hydrogen bonds, which link the mol­ecules in a chain along the a axis.

Bis(N,N-di­methyl­ethyl­enedi­amine)­copper(II) oxalate dihydrate, [Cu(C4H12N2)2](C2O4)·2H2O, has been synthesized. Both the cation and anion are centrosymmetric. The Cu atom is in a distorted square geometry, coordinated by the four N atoms of the bidentate ligands. There are long [2.583 (2) A] axial contacts to water. The crystal structure of the complex has a two-dimensional structure through hydrogen bonding.

In the title complex, [Cu(C(13)H(11)N(3)O(2))(2)(C(12)H(8)N(2))](NO(3))(2), the Cu(II )atom (site symmetry 2) is coordinated by four N atoms from one 1,10-phenanthroline and two hydrazine ligands, respectively. The hydrazine ligands coordinate to the Cu(II)atom by a pyridine N atom. These four atoms form a slightly distorted square-planar N(4) donor set. In the packing, two additional Cu⋯O inter-actions occur [Cu⋯O = 2.462 (2) Å], resulting in a typical Jahn-Teller-distorted octahedral environment around the Cu atom. N-H⋯O hydrogen bonds result in a three-dimensional network. The O atoms of the anion are disordered over two positions in a 0.68 (2):0.32 (2) ratio.

The asymmetric unit of the title compound, [Mg(H2O)6](C9H7N4O2S)2, contains one-half of a [Mg(H2O)6]2+ cation (overline{1} symmetry) and one uncoordinated 2-[(1-phenyl-1H-tetrazol-5-yl)sulfanyl]acetate anion. The MgII cation is coordinated by six water molecules, exhibiting a slightly distorted octahedral coordination. A two-dimensional network parallel to (001) is formed via extensive hydrogen-bonding interactions involving the water molecules as donors and the tetrazole N and carboxylate O atoms of the anion as acceptors. The shortest distance between two adjacent parallel benzene rings is 3.315 (2) Å. The dihedral angle between the benzene ring and the tetrazole ring is 40.98 (2)°.

In the title complex, [Cu(C9H6NO2S2)2(C3H4N2)2], the CuII atom, lying on an inversion centre, is coordinated by two O atoms and two N atoms in a geometry deviating slightly from square planar. Intermolecular hydrogen bonds link the complex molecules into a layer structure.