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In the structure of the title coordination polymer, [K(C8H5N2O6)]n, each ligand bridges six K+ cations. The carboxyl­ate group coordinates both bidentately to one K+ ion and monodentately to two K+ ions, while one nitro group coordinates bidentately to a fourth K+ ion. The last two K+ ions are coordinated by the remaining nitro group, one in a bidentate fashion, the other monodentately through one O atom. This bridging mode results in a three-dimensional network. The coordination geometry of the K+ ion is represented by an irregular KO9 polyhedron. Very weak C—H...O inter­actions are observed in the crystal structure.
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