Poly[diaquatris(μ 6 -4,6-dioxo-1,4,5,6-tetrahydro-1,3,5-triazine-2-carboxylato)tripotassium]

Abstract : 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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Acta Crystallographica Section E: Structure Reports Online, International Union of Crystallography, 2014, 70 (5), pp.m174-m175. 〈10.1107/S1600536814007569 〉
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Sarra Soudani, Emmanuel Aubert, Emmanuel Wenger, Christian Jelsch, Isabelle Gautier-Luneau, et al.. Poly[diaquatris(μ 6 -4,6-dioxo-1,4,5,6-tetrahydro-1,3,5-triazine-2-carboxylato)tripotassium]. Acta Crystallographica Section E: Structure Reports Online, International Union of Crystallography, 2014, 70 (5), pp.m174-m175. 〈10.1107/S1600536814007569 〉. 〈hal-01521990〉

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