Skip to main content
Log in

The dehydration behaviour of rare earth complexes ofm-nitrobenzoic acid

Journal of thermal analysis Aims and scope Submit manuscript

Cite this article


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.


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.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others


  1. Y. Xing, Z. S. Jin, Z. B. Duan and J. N. Ni, Acta Chimica Sinica (in China), 45 (1987) 1044.

    CAS  Google Scholar 

  2. Z. L. Wang, C. J. Niu, Z. S. Jin and J. Z. Ni, J Rare Earth, 10 (1992) 253.

    Google Scholar 

  3. Z. L. Wang, N. H. Ning, C. J. Niu and J. Z. Ni, Acta Physico-Chimica Sinica, 8 (1992) 642.

    CAS  Google Scholar 

  4. G. R. Choppin and L. J. Lajunen, Inorg. Chem., 25 (1986) 3512

    Article  Google Scholar 

  5. F. Weislawa, Monatshefte Fur Chemie, 119 (1988) 1345.

    Article  Google Scholar 

  6. J. F. Ma, Ph. D. Thesis, Changchun Institute of Applied Chemistry, Changchun, P. R. China, 1992.

  7. Z. L. Wang, W. D. Zhuang, W. M. Sun, C. J. Niu and J. Z. Ni, J. Rare Earth 9(2) (1991) 105.

    Google Scholar 

  8. E. S. Freemen and B. Carroll, J. Phys. Chem., 62 (1958) 394.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations


Rights and permissions

Reprints and Permissions

About this article

Cite this article

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).

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: