Acta Cryst. (2013). E69, m229-m230 [ doi:10.1107/S1600536813007629 ]
Abstract: The crystal structure of the title compound, [Cu(H2O)6](BF4)2·3C4H4N2O2, comprises discrete [Cu(H2O)6]2+ cations and BF4- anions along with three equivalents of pyrazine 1,4-dioxide (pzdo). The hexaaquacopper(II) ion and all three pzdo molecules lie about crystallographic inversion centers. The lattice is supported by an extensive hydrogen-bonding network. O-HO hydrogen bonding between the [Cu(H2O)6]2+ and pzdo units creates a pseudo-hexagonal lattice parallel to the bc plane. The BF4- anions lie in the voids of that lattice, held in place by O-HF hydrogen bonds, and also generate BF4--pzdo-BF4--pzdo stacks via short FN contacts [2.866 (3)-3.283 (4) Å].
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