Síntese, caracterização e estudo termoanalítico dos isoftalatos de disprósio, érbio, itérbio e lutécio
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2015-09-25
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Universidade Federal de Goiás
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Coordination compounds using dicarboxylic acids and lanthanides have attracted a great interest because their application as Metal-Organic Frameworks (MOF) and its luminescent characteristics. The heavy lanthanides isophthalates have synthesized in solid state and characterized using the techniques: Infrared absorption spectroscopy; Thermoanalytical techniques (TG-DSC simultaneously in air atmosphere and N2 atmosphere, DTG, DSC, TG-FTIR). The compounds stoichiometry were confirmed and the number of hydration waters were identified from the TG curves, defining the compounds of formula Ln2(Isoftal)3.nH2O, where Ln = Lanthanides; Isoftal = isophthalate; n = 4,5 (Dy), 7,5 (Er), 8,5 (m), 8 (Yb), and 9 (Lu). The compounds have the same thermal decomposition mechanism with formation of the respective lanthanide oxides when analyzed under air atmosphere, and formation of carbonaceous intermediates when analyzed under inert atmosphere (N2). The identity of gases during the dehydration and the decomposition of compounds identified as H2O, CO2, CO, and some traces of organic compounds, using coupled technique TG-FTIR. The infrared absorption spectra suggest that metal-ligand coordination is bridge bidentate.
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BEMBO FILHO, L. H. Síntese, caracterização e estudo termoanalítico dos isoftalatos de disprósio, érbio, itérbio e lutécio. 2015. 85 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2015.