title: Poly[diaquatris(μ6-4,6-dioxo-1,4,5,6-tetra-hydro-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 mol-ecule. 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 inter-connected 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, inter-molecular π-π stacking inter-actions exist between neighboring aromatic rings with a centroid-centroid distance of 3.241 (2) Å.
authors.affiliation: Laboratoire de Chimie des Matériaux, Faculté des sciences de Bizerte, 7021 Zarzouna, Tunisie.
authors.forename: Sarra
authors.initials: S
authors.lastname: Soudani
authors.affiliation: Cristallographie, Résonance Magnétique et Modélisations (CRM2), UMR CNRS 7036, Institut Jean Barriol, Université de Lorraine, BP 70239, Bd des Aiguillettes, 54506 Vandoeuvre-les-Nancy, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Aubert
authors.affiliation: Cristallographie, Résonance Magnétique et Modélisations (CRM2), UMR CNRS 7036, Institut Jean Barriol, Université de Lorraine, BP 70239, Bd des Aiguillettes, 54506 Vandoeuvre-les-Nancy, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Wenger
authors.affiliation: Cristallographie, Résonance Magnétique et Modélisations (CRM2), UMR CNRS 7036, Institut Jean Barriol, Université de Lorraine, BP 70239, Bd des Aiguillettes, 54506 Vandoeuvre-les-Nancy, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Jelsch
authors.affiliation: Université Joseph Fourier, Institut Néel, CNRS, Département MCMF, 25 rue des Martyrs, 39042 Grenoble cedex 9, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Gautier-Luneau
authors.affiliation: Laboratoire de Chimie des Matériaux, Faculté des sciences de Bizerte, 7021 Zarzouna, Tunisie.
authors.forename: Cherif
authors.initials: C
authors.lastname: Ben Nasr