Crystal structure of bis­(piperazin-1-ium-κN (4))bis­(thio­sulfato-κS)zinc(II) dihydrate

In the title compound, [Zn(C(4)H(11)N(2))(2)(S(2)O(3))(2)]·2H(2)O, two thio­sulfate ions coordinate to the zinc(II) atom through the terminal S atoms. The tetra­hedral coordination around the Zn(II) ion is completed by ligating to two N atoms of two piperazinium ions. The remaining two N atoms of the piperazinium ions are diprotonated and do not coordinate to the metal centre. In the crystal, however, they are involved in N—H⋯O(water) and N—H⋯Osulfato hydrogen bonds. Together, a series of N—H⋯O and O—H⋯O hydrogen bonds, involving the O atoms of the thio­sulfate ions and the water mol­ecules as acceptors and the hydrogen atoms of the piperazinium ions and the water mol­ecules as donors, form a three-dimensional supra­molecuar structure. Within this framework there are a number of intra- and inter­molecular C—H⋯O and C—H⋯S contacts present.