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Competitive coordination of the uranyl ion by perchlorate and water - The crystal structures of UO2(ClO4)(2)center dot 3 H2O and UO2(ClO4)(2)center dot 5 H2O and a redetermination of UO2(ClO4)(2)center dot 7 H2O
KTH, Superseded Departments, Chemistry.
2003 (English)In: Zeitschrift für Anorganische und Allgemeines Chemie, ISSN 0044-2313, E-ISSN 1521-3749, Vol. 629, no 6, 1012-1016 p.Article in journal (Refereed) Published
Abstract [en]

By slow evaporation of solutions containing UO2(ClO4)(2) and an excess of HClO4, single crystals of [UO2(ClO4)(2)(H2O)(3)] (1) and [UO2(H2O)(5)](ClO4)(2) (2) were obtained and their structures were determined. From similar solutions prepared from stoichiometric amounts of UO3 and perchloric acid, crystals of [UO2(H2O)(5)](ClO4)(2)(.)2H(2)O (3) were obtained. The trihydrate (monoclinic, P2(1)/c, a=545.44(1) pm, b=1811.09(5) pm, c = 1032.46(2) pm, beta=90.016(1)degrees)consists of uranyl ions, which are coordinated by two monodentate perchlorate ions and three water molecules. The pentahydrate (monoclinic, P2(1)/n, a=529.35(2) pm, b=1645.43(6) pm, c = 1480.18(6) pm, beta=99.847(1)degrees)contains uranyl ions coordinated by five water molecules. The same structural unit can be found in the heptahydrate, whose structure was re-determined (orthorhombic, Pbcn, a=920.9(3) pm, b=1067.9(3) pm, c=1445.7(3) pm). In this structure, two molecules of water of crystallization are present.

Place, publisher, year, edition, pages
2003. Vol. 629, no 6, 1012-1016 p.
Keyword [en]
hydrates, perchlorates, uranium, crystal structure, x-ray-diffraction
URN: urn:nbn:se:kth:diva-22581DOI: 10.1002/zaac.200200450ISI: 000183487800021OAI: diva2:341279
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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