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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—H...O 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—H...F hydrogen bonds, and also generate BF4–pzdo–BF4–pzdo stacks via short F...N contacts [2.866 (3)–3.283 (4) Å].

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The crystal structure of the title salt, C12H9N2+·HSO4·H2O, comprises inversion-related pairs of phenazinium ions linked by C—H...N hydrogen bonds. The phenazinium N—H atoms are hydrogen bonded to the bis­ulfate anions. The bis­ulfate anions and water mol­ecules are linked by O—H...O hydrogen-bonding inter­actions into a structural ladder motif parallel to the a axis.
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