title: Poly[di-μ-aqua-di-aqua-bis-(μ7-oxalato-κ(9) O (1):O (1):O (1),O (2):O (2):O (2'):O (2'),O (1'):O (1'))calciumdicaesium].
abstract: In the title compound, [CaCs2(C2O4)2(H2O)4] n , the Ca(2+) ion, lying on a twofold rotation axis, is coordinated by four O atoms from two oxalate ligands and two bridging water mol-ecules in an octa-hedral geometry. The Cs(+) ion is coordinated by seven O atoms from six oxalate ligands, one bridging water and one terminal water mol-ecule. The oxalate ligand displays a scarce high denticity. The structure contains parallel chain units runnig along [10-1], formed by two edge-sharing Cs polyhedra connected by CsO9 polyhedra connected by a face-sharing CaO6 octahedron. These chains are further linked by the oxalate ligands to build up a three-dimensional framework. O-H⋯O hydrogen bonds involving the water mol-ecules and the carboxyl-ate O atoms enhance the extended structure.
authors.affiliation: Laboratoire de Cristallographie-Thermodynamique, Faculté de Chimie USTHB BP 32 El-Alia, Bab Ezzouar 16111, Alger, Algeria.
authors.forename: Hamza
authors.initials: H
authors.lastname: Kherfi
authors.affiliation: Laboratoire de Cristallographie-Thermodynamique, Faculté de Chimie USTHB BP 32 El-Alia, Bab Ezzouar 16111, Alger, Algeria.
authors.forename: Malika
authors.initials: M
authors.lastname: Hamadène
authors.affiliation: Laboratoire de Cristallographie-Thermodynamique, Faculté de Chimie USTHB BP 32 El-Alia, Bab Ezzouar 16111, Alger, Algeria.
authors.forename: Achoura
authors.initials: A
authors.lastname: Guehria-Laïdoudi
authors.affiliation: CRM2 UMR-CNRS 7036 Jean Barriol Institut, Lorraine Université BP 230, 54506 Vandoeuvre-lés-Nancy Cedex, France.
authors.forename: Slimane
authors.initials: S
authors.lastname: Dahaoui
authors.affiliation: CRM2 UMR-CNRS 7036 Jean Barriol Institut, Lorraine Université BP 230, 54506 Vandoeuvre-lés-Nancy Cedex, France.
authors.forename: Claude
authors.initials: C
authors.lastname: Lecomte