Artigo 28 – Vol. 7 N. 1


Synthesis, characterization and thermal behaviour of solid compounds of heavy trivalente lanthanide and yttrium glycolates

Autores
D.J.C. Gomesa, W. D. G. Nunes, J. A. Teixeira, Oswaldo Treu-Filho, M. Ionashiro, F.J. Caires
Recebido em
 22 de Fevereiro de 2018
Aceito em
 02 de março de 2018
Publicado em
 15 de Março de 2018
DOI
 10.18362/bjta.v7.i1.28
Páginas
Keywords
heavy trivalent lanthanides, glycolate, thermal behavior, DFT calculation

 

Resumo

Synthesis, characterization, thermal stability and thermal decomposition of heavy trivalent lanthanide and yttrium glycolates, Ln(C2H3O3)3nH2O (Ln = Tb to Lu, Y) were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), Density Functional Theory (DFT) calculation, X-ray diffractometry, complexometry with EDTA and evolved gas analysis (TG-DSC-FTIR). All the compounds were obtained as dihydrates, except terbium one which was obtained an anhydrous amorphous compound. The thermal decomposition of the anhydrous compounds occured in three steps and the final residue was Ln2O3 (Ln = Tb to Lu, Y). The results also provided information concerning the ligand’s denticity, thermal behavior and identification of the gaseous products evolved during the thermal decomposition of these compounds. Furthermore, the theoretical and experimental spectroscopic data suggest the possible modes of coordination of the ligand with the metals.
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