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Synthesis and crystal structure of a 6- chloro­nicotinate salt of a one-dimensional cationic nickel(II) coordination polymer with 4,4′- bi­pyridine

A 6-chloro­nicotinate (6-Clnic) salt of a one-dimensional cationic nickel(II) coordination polymer with 4, 4′-bi­pyridine (4, 4′-bpy), namely, catena-poly[[[tetra­ aqua­nickel(II)]- μ-4, 4′-bi­pyridine- κ2N:N′] bis­(6-chloro­nicotinate) tetra­ hydrate], {; ; ; ; ; [Ni(C10H8N2)(H2O)4] (C6H3ClNO2)2·4H2O}; ; ; ; ; n or {; ; ; ; ; [Ni(4, 4′-bpy) (H2O)4](6-Clnic)2·4H2O}; ; ; ; ; n, (1), was prepared by the reaction of nickel(II) sulfate hepta­hydrate, 6-chloro­nicotinic acid and 4, 4′-bi­pyridine in a mixture of water and ethanol. The mol­ecular structure of 1 comprises a one-dimensional polymeric {; ; ; ; ; [Ni(4, 4′-bpy)(H2O)4]2+}; ; ; ; ; n cation, two 6- chloro­nicotinate anions and four water mol­ ecules of crystallization per repeating polymeric unit. The nickel(II) ion in the polymeric cation is octahedrally coordinated by four water mol­ecule O atoms and by two 4, 4′- bipyridine N atoms in the trans position. The 4, 4′-bi­pyridine ligands act as bridges and, thus, connect the symmetry- related nickel(II) ions into an infinite one-dimensional polymeric chain extending along the b-axis direction. In the extended structure of 1, the polymeric chains of {; ; ; ; ; [Ni(4, 4′-bpy)(H2O)4]2+}; ; ; ; ; n, the 6-chloro­nicotinate anions and the water mol­ecules of crystallization are assembled into an infinite three-dimensional hydrogen-bonded network via strong O—H⋯O and O—H⋯N hydrogen bonds, leading to the formation of the representative hydrogen- bonded ring motifs: tetra­meric R24(8) and R44(10) loops, a dimeric R22(8) loop and a penta­meric R45(16) loop.

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

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