Diaquabis(propane-1,3-diamine)nickel(II) bis(propane-1,3-diamine)disulfatonickelate(II)

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The ionic NiII title complex, [Ni(C3H10N2)2(H2O)2][Ni(SO4)2(C3H10N2)2], is built up of [Ni(dipr)2(H2O)2]2+ complex cations and [Ni(dipr)2(SO4)2]2− complex anions (dipr is propane-1,3-diamine). Both NiII atoms display a slightly distorted octa­hedral coordination and are located on inversion centers. There are several types of hydrogen-bonding inter­actions, which connect complex cations and anions into a two-dimensional network parallel to (010). Hydrogen bonds formed by the axially coordinated water mol­ecule of the complex cation and one of the O atoms of the sulfate groups of the complex anion (first type) link them into chains along the c axis. These chains are linked to each other through hydrogen bonds formed by an O atom (second type) of the SO4 groups and NH2 groups of the ligand of the complex cations from neighboring chains, forming a two-dimensional hydrogen-bonded net perpendicular to the b axis. The third type of O atoms of the sulfate groups of the complex anion are also linked into chains by a combination of both previously described types of H-atom connections.