catena-Poly[[(diaqua-calcium)-bis-(μ-2-fluorobenzoato)-1':1κO:O,O';1:1''κO,O':O] 2,2'-bipyridine hemi-solvate].

In the title compound, {[Ca(C7H4FO2)2(H2O)2]·0.5C10H8N2}n, the CaII atom is coordinated by eigth O atoms from four 2-fluoro­benzoate ligands and two water mol­ecules, resulting in a distorted CaO8 square-anti­prismatic coordination environment. The 2-fluoro­benzoate ligand bridges two symmetry-related CaII atoms, giving rise to a chain structure extending along [100]. The distances between the Ca atom and its two symmetry-related counterparts are 4.054 (2) and 4.106 (2) A. The polymeric chains are connected by classical O—H⋯N hydrogen bonds into a layer structure parallel to (010). The layers are connected by non-classical C—H⋯F hydrogen bonds into a three-dimensional supra­molecular structure. O—H⋯O and C—H⋯O inter­actions also occur. The uncoordinated 2,2′-bipyridine mol­ecule is located on a centre of symmetry at the mid-point of the bond between the two heterocycles. One of the two benzene rings is disordered over two sites with occupancy factors of 0.60 and 0.40.