catena-Poly[[(diaquacalcium)-bis(μ-2-fluorobenzoato)-1′:1κ3O:O,O′;1:1′′κ3O,O′:O] 2,2′-bipyridine hemisolvate]

Abstract

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) Å. 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.