Guanidinium hexaaquazinc(II) bis[tris(3-carboxypyridine-2-carboxylato)zincate]

Abstract

In the title molecular salt, (CH6N3)1.30[Zn(H2O)6]0.35[Zn(C7H4NO4)3]2, the ZnII atom (site symmetry 3) in the anion is coordinated by three N,O-bidentate 3-carboxypyridine-2-carboxylate monoanions to generate a fac-ZnN3O3 octahedral coordination geometry. The guanidinium cation (the C atom has site symmetry 3) and the octahedral hexaaquazinc(II) dication (the Zn2+ cation has site symmetry -3) are occupationally disordered in a 1.30:0.35 ratio. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds to generate infinite (001) sheets. Weak aromatic π–π stacking [centroid–centroid distance = 3.797 (8) Å] is also observed in the crystal.