Yueqin Li

Bis[μ- N , N ′-bis(quinolin-8-yl)pyridine-2,6-dicarboxamido]dizinc(II) dichloromethane disolvate

The title compound, [Zn(2)(C(25)H(15)N(5)O(2))(2)]·2CH(2)Cl(2), is a dinuclear double-helical complex which lies on a crystallographic twofold axis. In the complex, both ligands are partitioned into two tridentate domains which allow each ligand to bridge both metal centres. Each Zn(II) atom is six-coordinated in a distorted octahedral environment formed by two amide N atoms, two quinoline N atoms and two pyridine N atoms from two different ligand molecules, with the central pyridine ring, unusually, bridging two Zn(II) atoms. The deprotonated ligand is not planar, the amide side chains being considerably twisted out from the plane of the central pyridine ring.

Poly[[tetra­aqua­(μ6-2,2′-diiodo­biphenyl-4,4′,5,5′-tetra­carboxyl­ato)dizinc(II)] dihydrate]

In the title compound, {[Zn2(C16H4I2O8)(H2O)4]·2H2O}n, two crystallographically independent ZnII atoms are each located on a twofold rotation axis. Both ZnII atoms are in distorted octahedral coordination geometries: one is coordinated by six O atoms from four carboxylate groups, while the other is coordinated by two carboxylate groups and four water molecules. The tetracarboxylate ligand molecules connect the ZnII atoms, completing a three-dimensional metal–organic framework. O—H⋯O hydrogen bonds link the metal–organic framework with the uncoordinated water molecules.