Poly[diaqua­(μ(3)-pyridine-3,5-dicarboxyl­ato-κ(3) N:O (3):O (5))copper(II)]

The title complex, [Cu(C(7)H(3)NO(4))(H(2)O)(2)](n), was prepared under hydro­thermal reaction conditions. In the crystal structure, the Cu(II) cation is located on a twofold rotation axis and is coordinated by two carboxyl­ate O atoms and one N atom from three pyridine-3,5-dicarboxyl­ate (PDA) anions and two water mol­ecules with a distorted trigonal–bipyramidal geometry. The tridentate PDA anion is also located on the twofold rotation axis and bridges the Cu(II) cations to form a two-dimensional polymeric layer. O—H⋯O hydrogen bonding between layers links the two-dimensional layers into a three-dimensional supra­molecular framework.