title: catena-Poly[[diaquazinc(II)]-μ-trans-4,4'-diazenediyldibenzoato-κO,O':O'',O'''].
abstract: The title compound, [Zn(C(14)H(8)N(2)O(4))(H(2)O)(2)](n), consists of zigzag chains of Zn atoms bridged by azobenzene-4,4'-dicarboxyl-ate ligands. The Zn(II) atom, lying on a twofold rotation axis, is coordinated by four O atoms from the carboxyl-ate groups and two water mol-ecules, giving rise to a considerably distorted octa-hedral coordination envionment. The ligand lies on an inversion center. In the crystal structure, π-π inter-actions between the ligands [inter-planar distance = 3.527 (3) Å] assemble the chains into a sheet-like structure. O-H⋯O hydrogen bonds between the coordinated water mol-ecules and carboxyl-ate O atoms connect the sheets into a three-dimensional network.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan, and Graduate School of Science and Technology, Kobe University, Nada Ku, Kobe, Hyogo 657-8501, Japan.
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xu