title: Poly[[μ-aqua-tetraaquabis(μ-2-hydroxy-4-oxocyclobut-1-ene-1,3-diolato)strontium] hemihydrate].
abstract: In the title coordination polymer, {[Sr(C(4)HO(4))(2)(H(2)O)(5)]·0.5H(2)O}(n), the Sr(2+) ion is coordinated by three monodentate hydrogensquarate (hsq) anions and six aqua ligands in a distorted SrO(9) monocapped square-anti-prismatic geometry. The hsq anions and water mol-ecules bridge the metal ions into infinite sheets lying parallel to (100). The O atom of the uncoordinated water mol-ecule lies on a crystallographic twofold axis. The packing is stabilized by numerous O-H⋯O hydrogen bonds.
authors.forename: Amira
authors.initials: A
authors.lastname: Bouhali
authors.forename: Chahrazed
authors.initials: C
authors.lastname: Trifa
authors.forename: Sofiane
authors.initials: S
authors.lastname: Bouacida
authors.forename: Chaouki
authors.initials: C
authors.lastname: Boudaren
authors.forename: Thierry
authors.initials: T
authors.lastname: Bataille
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2011 Jan 29;67(Pt 2):m275-6
references.pmid: 21522923