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

A one-dimensional nickel(II) coordination polymer with the mixed ligands 6- fluoronicotinate (6-Fnic) and 4, 4′-bi­ pyridine (4, 4′-bpy), namely, catena- poly[[di­aqua­bis­(6- fluoro­pyridine-3- carboxyl­ato-κO)nickel(II)]- μ-4, 4′-bi­ pyri­dine-κ2N:N′] trihydrate], {; ; ; ; [Ni(6- Fnic)2(4, 4′-bpy)(H2O)2]·3H2O}; ; ; ; n, (1), was prepared by the reaction of nickel(II) sulfate hepta­hydrate, 6-fluoro­nicotinic acid (C6H4FNO2) and 4, 4′-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, 4′-bi­pyridine ligands, forming a trans isomer. The bridging 4, 4′-bi­pyridine ligands connect symmetry-related nickel(II) ions into infinite one-dimensional polymeric chains running in the [1 -1 0] 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—H⋯O and O—H⋯N hydrogen bonds, leading to the formation of distinct hydrogen-bond ring motifs: octa­meric R88(24) and hexa­meric R86(16) loops.

crystal structure ; nickel(II) ; 6-fluoro­nicotinic acid ; 4, 4′-bi­pyridine ; coordination polymer ; hydrogen-bond motif

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