catena-Poly[[diaquacalcium(II)]bis[μ-2-oxo-1,2-dihydropyridine-1-acetato]]

In the title coordination polymer, [Ca(2-OPA)2(H2O)2]n [2-OPA− is 2-oxo-1,2-di­hydro­pyridine-1-acetate, C7H6NO3], the Ca atom is eight-coordinated by six O atoms from four 2-OPA− ligands and two water mol­ecules, and displays a dodecahedral coordination geometry. Each 2-OPA− ligand bridges two adjacent Ca atoms, forming a chain along the a-axis direction. The Ca⋯Ca separation within the polymer is 4.1022 (8) A. A two-dimensional supramolecular framework is further constructed by hydrogen bonds and weak π–π stacking interactions.