The first coordination compound of 6-fluoro­nicotinate: the crystal structure of a one-dimensional nickel(II) coordination polymer containing the mixed ligands 6-fluoro­nicotinate and 4,4′-bi­pyridine

A one-dimensional nickel(II) coordination polymer with the mixed ligands 6-fluoronicotinate (6-Fnic) and 4,40 -bipyridine (4,40 -bpy), namely, atenapoly[diaquabis(6-fluoropyridine-3-carboxylato-O)nickel(II)]--4,40 -bipyridine-2 N:N0 ] trihydrate], {[Ni(6-Fnic)2(4,40 -bpy)(H2O)2]3H2O}n, (1), was prepared by the reaction of nickel(II) sulfate heptahydrate, 6-fluoronicotinic acid (C6H4FNO2) and 4,40 -bipyridine (C10H8N2) in a mixture of water and ethanol. The nickel(II) ion in 1 is octahedrally coordinated by the O atoms of two water molecules, two O atoms from O-monodentate 6-fluoronicotinate ligands and two N atoms from bridging 4,40 -bipyridine ligands, forming a trans isomer. The bridging 4,40 -bipyridine ligands connect symmetry-related nickel(II) ions into infinite one-dimensional polymeric chains running in the [110] direction. In the extended structure of 1, the polymeric chains and lattice water molecules are connected into a three-dimensional hydrogen-bonded network via strong O—HO and O—HN hydrogen bonds, leading to the formation of distinct hydrogen-bond ring motifs: octameric R8 8 (24) and hexameric R8 6 (16) loops