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In the title compound, {[Na(C 8 H 9 N 2 O 4 )(H 2 O)]·0.5H 2 O}  n  , the Na +  ion is coordinated by two bridging water mol­ecules, one N atom and three O atoms from three 4-carb­oxy-2-propyl-1 H -imidazole-5-carboxyl­ate (H 2 pimdc) ligands. Adjacent Na +  ions are linked alternately by two water O atoms and two carb­oxy O atoms into a chain along [001]. These chains are connected through the coordination of the carboxyl­ate O atoms to the Na +  ions, forming a three-dimensional structure. An intra­molecular O—H⋯O hydrogen bond and inter­molecular N—H⋯O and O—H⋯O hydrogen bonds are present in the crystal structure.

acta crystallographica. section e

Poly[[μ2-aqua-μ3-(4-carboxy-2-propyl-1H-imidazole-5-carboxylato-κ4N3,O4:O4:O5)-sodium] hemihydrate]