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Journal of Thermal Analysis and Calorimetry

, Volume 82, Issue 1, pp 77–82 | Cite as

Synthesis, characterization, spectroscopy and thermal analysis of rare earth picrate complexes with L-lysine

  • T. S. Martins
  • J. R. Matos
  • G. Vicentini
  • P. C. Isolani
Article

Summary

Rare earth picrate (RE) complexes with L-lysine (Lys) were synthesized and characterized. Elemental analysis (CHN), EDTA titrations and thermogravimetry data suggest a general formula RE(pic)3·2Lys·2H2O, where RE=La-Lu (without Pm) and Y, pic=picrate). IR spectra suggest that Lys is coordinated to the central ion through the nitrogen of the α-amino group. Parameters obtained from the absorption spectrum of the Nd compound indicated that the metal-ligand bonds are essentially electrostatic. Emission spectrum and biexponential behavior of the luminescence decay of the Eu compound suggest the existence of polymeric species. Thermogravimetric/derivative thermogravimetric (TG/DTG) and differential scanning calorimetry (DSC) curves of all complexes are very similar, with five events. The final products are the corresponding rare earth oxides and their X-ray diffraction patterns are identical to the calcinated oxides.</o:p>

thermal analysis luminescence L-lysine rare earths picrates synthesis and characterization 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • T. S. Martins
    • 1
  • J. R. Matos
    • 2
  • G. Vicentini
    • 3
  • P. C. Isolani
    • 4
  1. 1.Instituto de Química, Universidade de São Paulo
  2. 2.Instituto de Química, Universidade de São Paulo
  3. 3.Instituto de Química, Universidade de São Paulo
  4. 4.Instituto de Química, Universidade de São Paulo

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