Poly[[diaqua­(μ(4)-l-tartrato)(μ(2)-l-tartrato)dizinc(II)] tetra­hydrate]

In the title compound, {[Zn(C(4)H(4)O(6))(H(2)O)]·2H(2)O}(n), the l-tartrate ligands adopt μ(4)- and μ(2)-coordination modes. The Zn(II) atom adopts an octa­hedral geometry and is chelated by two kinds of l-tartrate ligands through the hydr­oxy and carboxyl­ate groups and coordinated by one unchelating carboxyl­ate O atom and one water mol­ecule. In the crystal, the l-tartrate ligands link the Zn(II) atoms, forming a two-dimensional coordination layer; these layers are futher linked into a three-dimensional supra­molecular network by O—H⋯O hydrogen bonds between the two-dimensional coordin­ation layers and the uncoordinated water mol­ecules. The latter are equally disordered over two positions.