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The asymmetric unit of the title compound, [K3(C4H2N3O4)3(H2O)2]n, contains two potassium cations (one in general position, one located on a twofold rotation axis), one and a half oxonate anions (the other half generated by twofold symmetry) and one water mol­ecule. As a result of the twofold symmetry, one H atom of the symmetric anion is statistically occupied. Both potassium cations are surrounded by eight oxygen atoms in the form of distorted polyhedra. Adjacent cations are inter­connected by oxygen bridges, generating layers parallel to (100). The aromatic ring system of the oxonate anions link these layers into a network structure. The crystal packing is stabilized by N—H...O, O—H...O and O—H...N hydrogen bonds, three of which are bifurcated. In addition, inter­molecular π–π stacking inter­actions exist between neighboring aromatic rings with a centroid–centroid distance of 3.241 (2) Å.

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In the title hydrated mol­ecular salt, 2C5H8N3O+·SO42−·H2O, the components are linked by N—H...Os and Ow—H...Os (s = sulphate, w = water) hydrogen bonds, generating a layer by a+b+c and 2ab translations. The cations are arranged nearly in parallel and show displaced π–π stacking centroid–centroid distance = 4.661 (2) Å between adjacent layers.
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