Triaqua[2,2′-(propane-1,3-diyl)bis(5-carboxy-1H-imidazole-4-carboxylato-κ(2) N (3),O (4))]calcium(II) tetrahydrate

In the title compound, [Ca(C(13)H(10)N(4)O(8))(H(2)O)(3)]·4H(2)O, the Ca(II) ion is hepta-coordinated by two N atoms and two O atoms from a tetra­dentate 1,3-bis-(1H-imidazole-4,5-dicarb­oxy­l­ate) propane dianion and three water O atoms, giving a distorted penta­gonal–bipyramidal coordination environment. The Ca—O bond lengths are in the range 2.354 (3)–2.453 (2) Å, while the Ca—N bond lengths are in the range 2.523 (2)–2.548 (2) Å. An intra­molecular O—H⋯O hydrogen bond between the carb­oxy and carboxyl­ate groups stabilizes the mol­ecular configuration. A three-dimensional network of N—H⋯O and O—H⋯O hydrogen bonds help to stabilize the crystal packing.