A one-dimensional coordination polymer with a three-dimensional supra­molecular framework: catena-poly[[[(3,4,7,8-tetra­methyl-1,10-phenanthroline)cadmium(II)]-[mu]₃-4,4'-sulfonyl­dibenzoato] trihydrate]

In the title mixed-ligand metal-organic polymeric compound, {[Cd(C₁₄H₈O₆S)(C₁₆H₁₆N₂)]·3H₂O}_n, the asymmetric unit contains a crystallographically unique Cd^II atom, one doubly deprotonated 4,4'-sulfonyl­dibenzoic acid (H₂SDBA) ligand, one 3,4,7,8-tetra­methyl-1,10-phenanthroline (TMPHEN) mol­ecule and three solvent water mol­ecules. Each Cd^II centre is six-coordinated by two O atoms from a chelating carboxyl­ate group of a SDBA^2- ligand, two O atoms from monodentate carboxyl­ate groups of two different SDBA^2- ligands and two N atoms from a chelating TMPHEN ligand. There are two coordination patterns for the carboxyl­ate groups of the SDBA^2- ligand, with one in a [mu]₁-[eta]¹:[eta]¹ chelating mode and the other in a [mu]₂-[eta]¹:[eta]¹ bis-monodentate mode. Single-crystal X-ray diffraction analysis revealed that the title compound is a one-dimensional double-chain polymer containing 28-membered rings based on the [Cd₂(CO₂)₂] rhomboid subunit. More inter­estingly, a chair-shaped water hexa­mer cluster is observed in the compound.

A novel two-dimensional coordination polymer: poly[di­aqua­tetra-[mu]₂-chlorido-[[mu]₂-2,2'-(piperazine-1,4-di­ium-1,4-di­yl)di­acetate]­di­cadmium(II)]

In the crystal structure of the title two-dimensional metal-organic polymeric complex, [Cd₂Cl₄(C₈H₁₄N₂O₄)(H₂O)₂]_n, the asymmetric unit contains a crystallographically independent Cd^II cation, two chloride ligands, an aqua ligand and half a 2,2'-(piperazine-1,4-diium-1,4-di­yl)di­acetate (H₂PDA) ligand, the piperazine ring centroid of which is located on a crystallographic inversion centre. Each Cd^II centre is six-coordinated in an octa­hedral environment by an O atom from an H₂PDA ligand and an O atom from an aqua ligand in a trans disposition, and by four chloride ligands arranged in the plane perpendicular to the O-Cd-O axis. The complex forms a two-dimensional layer polymer containing [CdCl₂]_n chains, which are inter­connected into an extensive three-dimensional hydrogen-bonded network by C-H...O, C-H...Cl and O-H...O hydrogen bonds.