A polymeric zinc thio­sulfate complex containing anionic and cationic chains based on tetra­hedral and octa­hedral zinc sites

catena-Poly[[[tetra­aqua­zinc(II)]-μ-4,4′-bipyridine-κ²N:N′] [[μ-thio­sulfato-κ²O:S-bis­[(thio­sulfato-κS)zinc(II)]]-di-μ-4,4′-pyridine-κ⁴N:N′] dihydrate], {[Zn(C₁₀H₈N₂)(H₂O)₄][Zn₂(S₂O₃)₃(C₁₀H₈N₂)₂]·2H₂O}_n, is a polymeric zinc complex built up from thio­sulfate-containing anionic chains, where the Zn atom is tetra­hedrally coordinated, and aqua-containing cationic chains incorporating octa­hedrally coordinated Zn. In each type of chain, the 4,4′-bipyridine units act as spacers, and the chains run along three non-inter­secting almost orthogonal directions in space. The profusion of hydrogen-bond donors (all the H atoms of the water mol­ecules) and acceptors (the thio­sulfate O and S atoms) generates a very complex hydrogen-bonding scheme.

An unusual P3₁2 framework for the Ni(4,4′-bipyridine)(H₂O)₄ chain

catena-Poly[[[tetra­aqua­nickel(II)]-μ-4,4′-bipyridine-κ²N:N′] thio­sulfate dihydrate], {[Ni(C₁₀H₈N₂)(H₂O)₄]S₂O₃·2H₂O}_n, (I), and catena-poly[[[tetra­aqua­nickel(II)]-μ-4,4′-bipyridine-κ²N:N′] sulfate methanol solvate monohydrate], {[Ni(C₁₀H₈N₂)(H₂O)₄]SO₄·CH₄O·H₂O}_n, (II), are built up of {[Ni(4,4′-bipy)(H₂O)₄]²⁺}_n chains (4,4′-bipy is 4,4′-bipyridine) inter­woven in an unusual P3₁ fashion. Voids are filled by the corresponding counter-anions and solvate mol­ecules, defining a complex three-dimensional network surrounding them. In both structures, the cationic chains evolve around a set of twofold axes passing through the Ni^II ions and bis­ecting the aromatic amines through their N (and their opposite C) atoms.

Poly[[μ₂-4,4′-bipyridine-di-μ₃-sulfito-dizinc(II)] monohydrate]

The title compound, {[Zn₂(SO₃)₂(C₁₀H₈N₂)]·H₂O}_n, is a two-dimensional polymer built up of a [ZnSO₃]_n chain evolving around a 2₁ axis and inter­connected by a 4,4′-bipyridine spacer. The resulting two-dimensional structures are linked, in turn, by hydrogen bonding mediated by the solvent water mol­ecule. The organic ligand lies on a centre of symmetry located on the mid-point of the bond between the rings, while the solvent water mol­ecule is halved by a twofold axis passing through the O atom.