Poly[(μ5-2-methyl-3,5-dinitro­benzoato)sodium]

In the crystal of the title coordination polymer, [Na(C8H5N2O6)]n, the Na(I) ion is linked to five nearby anions. Their bonding modes are three monodentate carboxyl­ate O atoms, one O,O′-bidentate carboxyl­ate group and one O,O′-bidentate nitro group. This results in an irregular NaO7 coordination geometry for the metal ion. This connectivity leads to a layered network propagating in (100).