Crystal structure of poly[bis­(μ(2)-5-hydroxy­nicotinato-κ(2) N:O (3))zinc]

The title coordination polymer, [Zn(C(6)H(4)NO(3))(2)](n), was prepared under hydro­thermal conditions by the reaction of zinc nitrate with 5-hy­droxy­nicotinic acid in the presence of malonic acid. In the structure, the Zn(II) ion is coordinated by two carboxyl­ate O atoms and two pyridine N atoms of four 5-hy­droxy­nicotinate ligands in a distorted tetra­hedral coordin­ation environment. The μ(2)-bridging mode of each anion leads to the formation of a three-dimensional framework structure. Inter­molecular hydrogen bonds between the hy­droxy groups of one anion and the non-coordinating carboxyl­ate O atoms of neighbouring anions consolidate the crystal packing.