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The dehydration behaviour of rare earth complexes ofm-nitrobenzoic acid

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Abstract

Rare earth complexes ofm-nitrobenzoic acid (LnL3·2H2O,Ln=La-Lu and Y, except Pm, HL=m-nitrobenzoic acid) were synthesized and characterized by elemental analysis, chemical analysis, IR spectroscopy and X-ray diffraction analysis. The dehydration behaviour of these complexes was studied in detail by means of TG-DTA and DSC. Dehydration occurs over the temperature range 76–215°C, and the temperature of formation of the anhydrous complexes decreases with increasing atomic number of the rare earth. The activation energies and enthalpy changes for te dehydration were obtained.

Zusammenfassung

Seltenerdenkomplexe vonm-Nitrobenzoesäure (LnL32H2O,Ln=La-Lu und Y, mit Ausnahme von Pm, HL=m-Nitrobenzoesäure) wurden synthetisiert und mittels Elementaranalyse, chemischer Analyse, IR-Spektroskopie und Röntgendiffraktionsanalyse charakterisert. Mit Hilfe von TG-DTA sowie DSC wurde das Dehydratationsverhalten dieser Komplexe im Detail untersucht. Die Dehydratation findet im Temperaturbereich 76–215°C statt und die Temperatur für die Bildung des wasserfreien Komplexes sinkt mit anwachsender Ordnungszahl des Seltenerdenelementes. Für die Dehydratation wurden auch Aktivierungsenergien und Enthalpieänderungen ermittelt.

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Authors and Affiliations

  1. Laboratory of Rare Earth Chemistry and Physics Changchum Institute of Applied Chemistry, Academy Sinica, 130022, Changchun, P. R. China

    Z. L. Wang, C. J. Niu, J. F. Ma & J. Z. Ni

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  1. Z. L. Wang
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  2. C. J. Niu
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  3. J. F. Ma
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  4. J. Z. Ni
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Wang, Z.L., Niu, C.J., Ma, J.F. et al. The dehydration behaviour of rare earth complexes ofm-nitrobenzoic acid. Journal of Thermal Analysis 41, 899–907 (1994). https://doi.org/10.1007/BF02547169

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  • DOI: https://doi.org/10.1007/BF02547169

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