Study of thermoanalytical behavior of heavier lanthanides terephthalates in air atmosphere
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Data
2018-06-04
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Coordination compounds of heavier lanthanides with terephthalate ligand have been synthesized and characterized
employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), differential scanning
calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), TG coupled to FTIR, elemental analysis and complexometry. The results from complexometry with EDTA and from TG curves allowed to establish the stoichiometry of
these compounds, which are in agreement with the Ln2(TFTa)3nH2O general formula where Ln represents trivalent
lanthanides or yttrium, TFTA is terephthalate and n = 4 (Er, and Y); 4.5 (Tb, Dy, Ho and Tm); 5 (Yb) and 6.5 (Lu). The
thermal decomposition of the anhydrous compounds occurs in two or three consecutive and/or overlapping steps, with the
formation of the respective oxides: Tb4O7 and Ln2O3 (Ln = Dy to Lu and Y). The TG-FTIR of the evolved gases obtained from the thermal decomposition of the synthesized compounds, identified the formation of CO2 and water as main
gaseous products. The FTIR results also led to information about the type of coordination of the isolated compounds which
suggest that the lanthanides are linked to the carboxylate groups by a bridging bond.
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Terephthalate, Heavier lanthanides, Thermal behavior, Lanthanides coordination compounds
Citação
COSTA, B. A. et al. Study of thermoanalytical behavior of heavier lanthanides terephthalates in air atmosphere. Journal of Thermal Analysis and Calorimetry, Budapeste, v. 134, p. 1205-1210, 2018. DOI: 10.1007/s10973-018-7373-x. Disponível em: https://link.springer.com/article/10.1007/s10973-018-7373-x. Acesso em: 27 out. 2023.