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Acta Cryst. (2013). E69, m649-m650
[ doi:10.1107/S1600536813030365 ]

Tetra­aqua­bis­(piperazin-1-ium)cobalt(II) bis­(sulfate) dihydrate

T. Sahbani, W. Smirani Sta and M. Rzaigui

Abstract: In the centrosymmetric title compound, [Co(C4H11N2)2(H2O)4](SO4)2·2H2O, the CoII atom is coordinated in a distorted octa­hedral geometry by four water O atoms and two piperazinium N atoms. These four water O atoms define an equatorial plane with a maximum deviation of 0.0384 (1) Å while the two piperazinium N atoms complete the octa­hedron in the axial positions. Neighboring complex mol­ecules and sulfate anions are connected through an extensive network of N-H...O and O-H...O hydrogen bonds, which link the different chemical species into layers in the ab plane. Additional Owater-H...O hydrogen bonds involving the non-coordinating water mol­ecules and C-H...O inter­actions connect these layers into a three-dimensional supra­molecular structure.

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