Abstract
The asymmetric unit of the title compound, Rb+·C4H3N2O3 −·C4H4N2O3·H2O, consists of one rubidium cation, a barbituric acid molecule, a barbiturate anion and one water molecule. The rubidium ion has seven close-contact interactions with O atoms, with Rb⋯O distances ranging from 2.8594 (16) to 3.2641 (14) Å. These seven O atoms together with an eighth O atom at 3.492 (2) Å away from Rb form a distorted polyhedron with shape intermediate between an antiprism and a dodecahedron. The Rb+ ions connect layers built of organic components and water molecules linked via N—H⋯O and O—H⋯O hydrogen bonds.
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