title: A novel zirconium polyoxometalate compound: (NH(4))(9)[Zr(2)(mu-OH)(H(2)O)(2)(AsOH)(2)(AsW(7)O(28))(AsW(10)O(36))].26H(2)O.
abstract: The crystal structure of the title compound, nonaammonium (arsenic decatungstido)(arsenic heptatungstido)diaqua-mu-hydroxo-(hydroxyarsenido)dizirconium hexacosahydrate, which was obtained from the reaction of [NaAs(4)W(40)O(140)](27-) with Zr(IV), has been determined. The anionic complex consists of two hydroxyl-bridged seven-coordinate capped trigonal-prismatic zirconium ions, which are bonded to an [AsW(10)O(36)](9-) anion and to an [AsW(7)O(28)](11-) anion that has two [AsOH](2+) capping units. The asymmetric unit contains half of the complex, with one crystallographically independent Zr atom. Crystallographic m symmetry imposed by the monoclinic C2/m space group gives rise to the asymmetric unit comprising half of the complex with one crystallographically independent Zr atom.
authors.affiliation: Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, England.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Gaunt
authors.forename: Iain
authors.initials: I
authors.lastname: May
authors.forename: David
authors.initials: D
authors.lastname: Collison
authors.forename: Madeleine
authors.initials: M
authors.lastname: Helliwell