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 one-dimensional zinc(II) coordination polymer incorporating [1,1′-bi­phen­yl]-4,4′-dicarboxyl­ate and N,N′-bis­(pyridin-3-ylmeth­yl)-[1,1′-bi­phen­yl]-4,4′-dicarboxamide ligands

In the title compound, catena-poly[[[N,N′-bis­(pyridin-3-ylmeth­yl)-[1,1′-biphen­yl]-4,4′-dicarboxamide]­chlorido­zinc(II)]-μ-[1,1′-biphen­yl]-4,4′-dicarboxyl­ato-[[N,N′-bis­(pyridin-3-ylmeth­yl)-[1,1′-biphen­yl]-4,4′-dicarboxamide]­chloridozinc(II)]-μ-[N,N′-bis­(pyridin-3-ylmeth­yl)-[1,1′-biphen­yl]-4,4′-dicarboxamide]], [Zn₂(C₁₄H₈O₄)Cl₂(C₂₆H₂₂N₄O₂)₃]_n, the Zn^II centre is four-coordinate and approximately tetra­hedral, bonding to one carboxyl­ate O atom from a bidentate bridging dianionic [1,1′-biphen­yl]-4,4′-dicarboxyl­ate ligand, to two pyridine N atoms from two N,N′-bis­(pyridin-3-ylmeth­yl)-[1,1′-biphen­yl]-4,4′-dicarboxamide ligands and to one chloride ligand. The pyridyl ligands exhibit bidentate bridging and monodentate terminal coordination modes. The bidentate bridging pyridyl ligand and the bridging [1,1′-biphen­yl]-4,4′-dicarboxyl­ate ligand both lie on special positions, with inversion centres at the mid-points of their central C—C bonds. These bridging groups link the Zn^II centres into a one-dimensional tape structure that propagates along the crystallographic b direction. The tapes are inter­linked into a two-dimensional layer in the ab plane through N—H...O hydrogen bonds between the monodentate ligands. In addition, the thermal stability and solid-state photoluminescence properties of the title compound are reported.

Magnetic investigations of a two-dimensional coordination polymer with a three-dimensional supra­molecular framework: poly[[bis­[[mu]₂-1,4-bis­(1,2,4-triazol-1-yl)butane]­bis­(thio­cyanato-[kappa]N)cobalt(II)] dihydrate]

In the title mixed-ligand metal-organic polymeric complex, {[Co(NCS)₂(C₈H₁₂N₆)₂]·2H₂O}_n, the asymmetric unit contains a divalent Co^II cation, which sits on an inversion centre, two halves of two crystallographically distinct and centrosymmetric 1,4-bis­(1,2,4-triazol-1-yl)butane (BTB) ligands, one N-bound thio­cyanate ligand and one solvent water mol­ecule. The Co^II atom possesses a distorted {CoN₆} octa­hedral geometry, with the equatorial positions taken up by triazole N atoms from four different BTB ligands. The axial positions are filled by thio­cyanate N atoms. In the crystal, each Co^II atom is linked covalently to four others through the distal donors of the tethering BTB ligands, forming a neutral (4,4)-topology two-dimensional rhomboid grid layer motif, which is coincident with the (11) crystal planes. Magnetic investigations show that weak antiferromagnetic coupling exists between Co^II atoms in the complex.

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.