catena-Poly[diammonium [diaquabis(pyridine-2,4-dicarboxylato-κ2N,O2)cuprate(II)] [[diaquacopper(II)]-μ-pyridine-2,4-dicarboxylato-κ3N,O2:O2′-[tetraaquacadmium(II)]-μ-pyridine-2,4-dicarboxylato-κ3O2:N,O2′] hexahydrate]

Abstract

The title mixed-metal complex, {(NH4)2[Cu(C7H3NO4)2(H2O)2][CdCu(C7H3NO4)2(H2O)6]·6H2O}n, contains one octahedrally coordinated CdII center and two octahedrally coordinated CuII centers, each lying on an inversion center. The two CuII atoms are each coordinated by two O atoms and two N atoms from two 2,4-pydc (2,4-H2pydc = pyridine-2,4-dicarboxylic acid) ligands in the equatorial plane and two water molecules at the axial sites, thus producing two crystallographically independent [Cu(2,4-pydc)2(H2O)2]2− metalloligands. One metalloligand exists as a discrete anion and the other connects the Cd(H2O)4 units, forming a neutral chain. O—H...O and N—H...O hydrogen bonds connects the polymeric chains, complex anions, ammonium cations and uncoordinated water molecules into a three-dimensional supramolecular network.