Poly[[diaqua­bis­{μ-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-2-yl]benzoato-κ(2) O:N (4′)}zinc] dimethyl­formamide tetra­solvate]

In the title compound, {[Zn(C(24)H(15)N(2)O(4))(2)(H(2)O)(2)]·4C(3)H(7)NO}(n), the Zn(II) ion is located on an inversion center and is six-coordinated by two N atoms from two ligands, two carboxylate O atoms from two other symmetry-related ligands and two O atoms from two water mol­ecules, furnishing a slightly distorted octa­hedral geometry. The Zn(II) atoms are connected by the bridging ligands into a layer parallel to (101). O—H⋯O hydrogen bonds link the layers and the dimethyl­formamide solvent mol­ecules. π–π inter­actions between the pyridine and benzene rings [centroid–centroid distances = 3.7428 (17) and 3.7619 (17) Å] and intra­layer O—H⋯O hydrogen bonds are also present.