title: Poly[[bis-[μ(2)-8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxyl-ato]zinc(II)] dihydrate].
abstract: The title compound, {[Zn(C(14)H(16)N(5)O(3))(2)]·2H(2)O}(n) or [Zn(ppa)(2)]·2H(2)O}(n), where ppa = 8-ethyl-5,8-dihydro-5-oxo-2-(1-piperazin-yl)-pyrido(2,3-d)-pyrimidine-6-carboxyl-ate, was synthesized under hydro-thermal conditions. The Zn(II) atom (site symmetry ) exhibits a distorted trans-ZnN(2)O(4) octa-hedral geometry defined by two monodentate N-bonded and two bidentate O,O-bonded ppa monoanions. The extended two-dimensional structure arising from this connectivity is a square grid and the disordered uncoordinated water mol-ecules occupy cavities within the grid. An N-H⋯O hydrogen bond occurs.
authors.forename: Wen
authors.initials: W
authors.lastname: Xu
authors.forename: Da-Sheng
authors.initials: DS
authors.lastname: Zhu
authors.forename: Xiao-Dan
authors.initials: XD
authors.lastname: Song
authors.forename: Zhe
authors.initials: Z
authors.lastname: An