catena-Poly[[diaqua­calcium]bis­[μ-2-(1,3-dioxoisoindolin-2-yl)acetato]-κ(3) O,O′:O;κ(3) O:O,O′]

In the title complex, [Ca(C(10)H(6)NO(4))(2)(H(2)O)(2)](n), the Ca(II) atom lies on a twofold rotation axis and adopts a dodeca­hedral geometry. The Ca(II) atom is octa­coordinated by two O atoms from two water mol­ecules and six O atoms from four acetate ligands. Each acetate acts as a tridentate ligand bridging two Ca(II) atoms, resulting in a chain running along the c axis. O—H⋯O and C—H⋯O hydrogen bonds connect the chains into a two-dimensional network parallel to [011]. π–π inter­actions between adjacent isoindoline-1,3-dione rings [centroid–centroid distance = 3.4096 (11) Å] further consolidate the structure. One of the carboxylate O atoms is disordered over two sites in a 0.879 (12):0.121 (12) ratio.