Poly[bis­(μ(2)-pyrimidine-2-carboxyl­ato-κ(4) O,N:O′,N′)calcium]

In the crystal structure of the title polymeric complex, [Ca(C(5)H(3)N(2)O(2))(2)](n), the Ca(II) cation has site symmetry [Image: see text] m2 and is N,O-chelated by four pyrimidine-2-carboxyl­ate anions in a square-anti­prismatic geometry. The planar pyrimidine-2-carboxyl­ate anion is located on a crystallographic special position, three C atoms have site symmetry 2mm, while the carboxyl O atom, the pyrimidine N atom and the other C atom have site symmetry m. Each pyrimidine-2-­carboxyl­ate anion bridges two Ca(II) cations, forming polymeric sheets extending parallel to (001). π–π stacking exists between parallel pyrimidine rings [centroid–centroid distance = 3.6436 (6) Å] of adjacent polymeric sheets. Weak C—H⋯O hydrogen bonding is also observed between these sheets.