title: Poly[tetra-aqua-di-μ(4)-malonato-barium(II)cadmium(II)].
abstract: In the title complex, [BaCd(C(3)H(2)O(4))(2)(H(2)O)(4)](n), the Ba(II) atoms, located on crystallographic twofold axes, adopt slightly distorted square-anti-prismatic coordination geometries, while the Cd(II) atoms, which lie on crystallographic centres of symmetry, have a distorted octa-hedral coordination. Each malonate dianion binds two different Cd(II) atoms and two different Ba(II) atoms. This connectivity generates alternating layers along [100] in the structure, with one type containing Cd(II) cations and malonate dianions, while the other is primarily composed of Ba(II) ions and coordinated water mol-ecules. The water mol-ecules also participate in extensive O-H⋯O hydrogen bonding.
authors.affiliation: School of Environment and Chemical Engineering and, Key Laboratory of Hollow Fiber Membrane Materials & Membrane Processes, Tianjin Polytechnic University, Tianjin 300160, People's Republic of China.
authors.forename: Ming-Lin
authors.initials: ML
authors.lastname: Guo
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Gao
authors.forename: Cong-Cong
authors.initials: CC
authors.lastname: Luo
authors.forename: Long
authors.initials: L
authors.lastname: Liu