1,4-Diazo-niabicyclo-[2.2.2]octane hexa-aqua-magnesium bis-(sulfate).

In the title compound, (C(6)H(14)N(2))[Mg(H(2)O)(6)](SO(4))(2), the Mg(II) ion, lying on an inversion center, is coordinated by six water mol-ecules in a slightly distorted octa-hedral geometry. The 1,4-diazo-niabicyclo-[2.2.2]octane cation is located about a twofold rotation axis. Inter-molecular N-H⋯O and O-H⋯O hydrogen bonds link the cations and the anions into a three-dimensional network.