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

Abstract

In the title compound, [Zn(C4H11N2)2(S2O3)2]·2H2O, two thiosulfate ions coordinate to the zinc(II) atom through the terminal S atoms. The tetrahedral coordination around the ZnII 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...Owater 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.