title: Bis(μ-3-carb-oxy-2-hy-droxy-propane-1,2-dicarboxyl-ato)bis(diaquazinc)-1,2-bis-(pyridin-4-yl)ethene-water (1/1/2).
abstract: The asymmetric unit of the title compound, [Zn(2)(C(6)H(6)O(7))(2)(H(2)O)(4)]·C(12)H(10)N(2)·2H(2)O, comprises half of a centrosymmetric complex dimer, half of a 1,2-bis-(pyridin-4-yl)ethene mol-ecule, which lies across an inversion centre, and one lattice water mol-ecule. Carboxyl-ate groups of two dianionic citrate ligands bridge two Zn(II) ions to give the cyclic dimer, with each Zn(II) ion coordinated by four O atoms from the chelating citrate ligand (one hy-droxy and three carboxyl-ate, with one bridging) and two water O atoms, forming a distorted octa-hedral environment [Zn-O = 2.040 (3)-2.244 (3) Å]. In the crystal, O-H⋯O and O-H⋯N hydrogen bonds involving hy-droxy groups and both coordinating and lattice water mol-ecules link the dimers to give a three-dimensional framework structure.
authors.affiliation: Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 139-743,  Republic of Korea.
authors.forename: In Hong
authors.initials: IH
authors.lastname: Hwang
authors.forename: Pan-Gi
authors.initials: PG
authors.lastname: Kim
authors.forename: Cheal
authors.initials: C
authors.lastname: Kim
authors.forename: Youngmee
authors.initials: Y
authors.lastname: Kim