catena-Poly[[diaqua­calcium(II)]-di-μ-2-chloro­nicotinato]

The itle compound, [Ca(C(6)H(3)ClNO(2))(2)(H(2)O)(2)](n), contains polymeric chains extending along [100] that are generated by inversion centres. The Ca(2+) ions are bridged by 2-chloronicotinate groups and exhibit an eight-coordination by six carboxylate O atoms of four different 2-chloronicotinate ligands and two O atoms of water molecules. In the crystal structure, inter­molecular O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds result in the formation of a supra­molecular network structure. The π–π contacts between the 2-chloro­nicotinate rings [centroid–centroid distances = 3.875 (3) and 3.701 (3) Å] may further stabilize the structure.