catena-Poly[(di-aqua-cadmium)-µ-iminodi-acetato-κ(4) O,N,O':O''].

In the title compound, [Cd(C4H5NO4)(H2O)2] n , the Cd(II) atom exhibits a distorted octa-hedral coordination geometry, defined by one N atom and three O atoms from two iminodi-acetate (IDA) ligands and two water molecules. The tridentate IDA ligand additionally bridges via one of its carboxylate O atoms to another Cd(II) atom, thus forming a zigzag chain along [001]. A three-dimensional network is completed by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds.

Poly[[µ-chlorido-µ-[2-(2,4-di-fluoro-phen-yl)-1,3-bis-(1,2,4-triazol-1-yl)propan-2-ol-κ(2) N (4):N (4')]-zinc] chloride dihydrate].

The title compound, {[ZnCl(C13H12F2N6O)2]Cl·2H2O} n , is a two-dimensional coordination polymer. The Zn(II) atom is six-coordinated by four N atoms from four 2-(2,4-di-fluoro-phen-yl)-1,3-bis-(1,2,4-triazol-1-yl)propan-2-ol (HFlu) ligands and by two Cl atoms in a distorted octa-hedral geometry. Two Cl atoms bridge two Zn(II) atoms, forming a centrosymmetric dinuclear unit. The HFlu ligands connect the dinuclear units into a 4(4) net parallel to (001) when the dinuclear unit is considered as a node. O-H⋯O and O-H⋯Cl hydrogen bonds link the cationic layer, free chloride anions and lattice water mol-ecules. Intra-layer π-π inter-actions between the triazole rings are observed [centroid-centroid distance = 3.716 (6) Å].

µ-Oxalato-κ(4)O(1),O(2):O(1'),O(2')-bis-[aqua-(2,2'-bipyridine-κN)(nitrato-κ(2)O,O')lead(II)].

The title compound, [Pb(2)(C(2)O(4))(NO(3))(2)(C(10)H(8)N(2))(2)(H(2)O)(2)], was synthesized hydro-thermally. The binuclear complex mol-ecule is centrosymmetric, the inversion centre being located at the mid-point of the oxalate C-C bond. The Pb(II) ion is hepta-coordinated by the O atom of one water mol-ecule, two oxalate O atoms, two nitrate O atoms and two 2,2'-bipyridine N atoms, forming an irregular coordination environemnt. Inter-molecular O-H⋯O hydrogen bonds between water mol-ecules and oxalate and nitrate ions result in the formation of layers parallel to (010). π-π inter-actions between pyridine rings in adjacent layers, with centroid-centroid distances of 3.584 (2) Å, stabilize the structural set-up.

Dichlorido(ethanol-κO)[2-(1,3-thia-zol-4-yl-κN)-1H-benzimidazole-κN(3)]copper(II).

In the title complex, [CuCl(2)(C(10)H(7)N(3)S)(C(2)H(5)OH)], the Cu(II) ion is five-coordinated in a distorted square-pyramidal geometry by two N atoms from a 2-(1,3-thia-zol-4-yl)-1H-benzimidazole ligand, one O atom from an ethanol mol-ecule and two Cl atoms. In the crystal, O-H⋯Cl and N-H⋯Cl hydrogen bonds link the complex mol-ecules into a layer parallel to (100). π-π inter-actions between the thia-zole rings are observed [centroid-centroid distance = 3.749 (3) Å].

Poly[[µ(2)-aqua-µ(3)-(4-carb-oxy-2-propyl-1H-imidazole-5-carboxyl-ato-κN,O:O:O)-sodium] hemihydrate].

In the title compound, {[Na(C(8)H(9)N(2)O(4))(H(2)O)]·0.5H(2)O}(n), the Na(+) ion is coordinated by two bridging water mol-ecules, one N atom and three O atoms from three 4-carb-oxy-2-propyl-1H-imidazole-5-carboxyl-ate (H(2)pimdc) ligands. Adjacent Na(+) ions are linked alternately by two water O atoms and two carb-oxy O atoms into a chain along [001]. These chains are connected through the coordination of the carboxyl-ate O atoms to the Na(+) ions, forming a three-dimensional structure. An intra-molecular O-H⋯O hydrogen bond and inter-molecular N-H⋯O and O-H⋯O hydrogen bonds are present in the crystal structure.