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Thermal behaviour of sulphato and nitrato complexes of cerium(IV)

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Abstract

Four sulphato and nitrato complexes of cerium(IV),viz. (NH4)4Ce(SO4)4·2H2O (1), (NH4)2Ce(SO4)3 (2), (NH4)2Ce(NO3)6 (3) and Cs2Ce(NO3)6 (4) were studied by simultaneous TG/DTA under various experimental conditions in order to establish their decomposition mechanism and to compare the results with the literature data which have been reviewed. In the case of the ammonium compounds (1, 2 and3) the decompositions are accompanied by changes in the oxidation state of cerium; the presence of Ce(III) and Ce(IV) were studied byex situ magnetic susceptibility and XPS measurements. The crystal structure of (1) was determined as well. It forms monoclinic crystals with space groupP21/c; the parameters of the unit cell are:a=12.638(18) Å,b=11.362(10) Å,c=13.607(11) Å, β=110.17(9)°,V=1834.05 Å3.

Zusammenfassung

Zur Ermittlung des Zersetzungsmechanismus und zum Vergleich der Resultate mit den im Überblick angegebenen Literaturangaben wurden mittels simultaner TG/DTA unter verschiedenen Versuchsbedingungen vier Sulfato- und Nitratokomplexe von Zer(IV), nämlich von (NH4)4Ce(SO4)4·2H2O (1), (NH4)2Ce(SO4)3 (2), (NH4)2Ce(NO3)6 (3) und Cs2Ce(NO3)6 (4) untersucht. Im Falle der Ammoniumverbindungen (1, 2 und3) werden die Zersetzungen von Änderungen des Oxidationszustandes von Zer begleitet; die Gegenwart von Ce(III) und Ce(IV) wurde durch ex situ Messungen der magnetischen Suszeptibilität und durch XPS-Messungen untersucht. Weiterhin wurde auch die Kristallstruktur von1 ermittelt. Diese Verbindung bildet monoklinische Kristalle der Raumgruppe P21/c; die Parameter der Elementarzelle lauten:a=12.638(18) Å,b=11.362(10) Å,c=13.607(11) Å, β=110.17(9),V=1834.0.5 Å3.

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  1. G. Pokol

    Present address: Institute for General and Analytical Chemistry, Technical University of Budapest, H-1521, Budapest, Hungary

Authors and Affiliations

  1. Laboratory of Inorganic and Analytical Chemistry, Helsinki University of Technology, FIN-02150, Espoo, Finland

    G. Pokol, T. Leskelä & L. Niinistö

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  2. T. Leskelä
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  3. L. Niinistö
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Pokol, G., Leskelä, T. & Niinistö, L. Thermal behaviour of sulphato and nitrato complexes of cerium(IV). Journal of Thermal Analysis 42, 343–359 (1994). https://doi.org/10.1007/BF02548521

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