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Item Rare-earth metal compounds with a novel ligand 2-methoxycinnamylidenepyruvate: a thermal and spectroscopic approach(2016) Carvalho, Cláudio Teodoro de; Oliveira, Giulyane Felix de; Fernandes, Joelson; Siqueira, Adriano Buzutti de; Ionashiro, Elias Yuki; Ionashiro, MassaoCompounds of 2-methoxycinnamylidenepyruvate with trivalent lanthanide ions (Tb, Ho, Er, Tm, Yb and Lu) were obtained in solid state and studied mainly in terms of their thermal and spectroscopic properties. The analyses of the characterization were performed by thermogravimetric system coupled to a mass and infrared spectrometer (TG–DTA/MS and TG–DTA/FT-IR), X-ray powder diffractometry, differential scanning calorimetry (DSC), infrared (FT-IR), preliminary study of fluorescence as well as classical technique of titration with EDTA. From these results, it was possible to establish the stoichiometry, thermal behavior, hydration water content, and the gaseous products released in the thermal decomposition steps, and suggest the type of metal-ligand coordination.Item Synthesis, characterization and thermal behaviour of solid 2- methoxycinnamylidenepyruvate of some bivalent metal ions in CO2 and N2 atmospheres(2010) Carvalho, Cláudio Teodoro de; Siqueira, Adriano Buzutti de; Ionashiro, Elias Yuki; Ionashiro, MassaoSolid State M-2-MeO-CP compounds, where M stands for bivalent metals (Mn, Fe, Co, Ni, Cu and Zn) and 2-MeO-CP is 2-methoxycinnamylidenepyruvate, were synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO and N atmospheres. The results were consistent with the general formula: M(L) ·H O. In 2 2 2 2 both atmospheres (CO , N ) the thermal decomposition occurs in consecutive steps which are characteristic of 2 2 each compound. For CO atmosphere the final residues were: Mn O , Fe O , Co O , NiO, Cu O and ZnO, while 2 3 4 3 4 3 4 2 under N atmosphere the thermal decomposition is still observed at 1000 º C.