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Synthesis and characterisation of TlLn(SO4)2·xH2O (Ln=La-Tb)

Synthese und Charakterisierung von TlLn(SO4)2·xH2O (Ln=La-Tb)

  • Anorganische Und Physikalische Chemie
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

Abstract

The compounds TlLn(SO4)2·2H2OLn=La, Ce, Pr, Nd and Tl[Ln(SO4)2(H2O)3]·H2OLn=Nd, Sm, Eu, Gd, Tb have been isolated from aqueous solutions of the corresponding sulfates. The dihydrates are all isomorphous and crystallize monoclinic, space groupP21/n,Z=4. The compounds which belong to the second type are also isomorphous and crystallize in monoclinic space groupP 21/c withZ=4.

The dehydration has been studied by thermogravimetry, differential scanning calorimetry and isothermal weight change determination. The dihydrates dehydrate in a single step. For the tetrahydrates the reaction is more complex, however no intermediate phases could be isolated.

The unit cell parameters, the dehydration temperatures and the dehydration enthalpies are correlated to the ionic radii ofLn 3+.

Zusammenfassung

Die Verbindungen TlLn(SO4)2·2H2OLn=La, Ce, Pr, Nd und Tl[Ln(SO4)2(H2O)3]·H2OLn=Nd, Sm, Eu, Gd, Tb wurden aus wäßrigen Lösungen der entsprechenden Sulfate isoliert. Die Dihydrate sind alle isomorph und kristallisieren monoklin, RaumgruppeP 21/n,Z=4. Die Verbindungen des zweiten Typs sind auch isomorph und kristallisieren in der monoklinen RaumgruppeP 21/c mitZ=4.

Die Dehydration wurde mit TG, DSC und dem isothermalen Gewichtsverlust untersucht. Die Entwässerung der Dihydrate verläuft in einer Stufe, die von Tetrahydraten aber in mehreren Stufen mit keiner isolierbaren Zwischenphase.

Die Gitterkonstanten, die Dehydratations-Temperaturen und -Enthalpien wurden mit den Ionenradien vonLn 3+ korreliert.

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Authors and Affiliations

  1. Department of Chemistry, E. Kardelj University, YU-61001, Ljubljana, Yugoslavia

    Nataša Bukovec & Peter Bukovec

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  1. Nataša Bukovec
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  2. Peter Bukovec
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Bukovec, N., Bukovec, P. Synthesis and characterisation of TlLn(SO4)2·xH2O (Ln=La-Tb). Monatsh Chem 118, 301–305 (1987). https://doi.org/10.1007/BF00809939

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  • DOI: https://doi.org/10.1007/BF00809939

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