title: Poly[[diaqua-bis-{μ-4-[6-(4-carboxyphenyl)-4,4'-bipyridin-2-yl]benzoato-κ(2)O:N(4')}zinc] dimethyl-formamide tetra-solvate].
abstract: 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 mol-ecules, furnishing a slightly distorted octa-hedral 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 dimethyl-formamide solvent mol-ecules. π-π inter-actions between the pyridine and benzene rings [centroid-centroid distances = 3.7428 (17) and 3.7619 (17) Å] and intra-layer O-H⋯O hydrogen bonds are also present.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022,  People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Ge
authors.forename: Shuyan
authors.initials: S
authors.lastname: Song