Synthesis, thermoanalytical and spectroscopic studies of trivalent lanthanides (Eu-Ho) complexes with the valsartan ligand
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Data
2020-04-01
Autores
Ekawa, Bruno [UNESP]
Sobral Carvalho, Ana Carina [UNESP]
Fernandes, Richard Perosa [UNESP]
Carneiro Soares do Nascimento, Andre Luiz [UNESP]
Caires, Flavio Junior [UNESP]
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Editor
Elsevier B.V.
Resumo
Trivalent lanthanides (Eu-Ho) complexes with Valsartan ligand were characterized by analytical, thermoanalytical and spectroscopic techniques. The comparison of the thermal decomposition of the compounds were made by plotting a 2D contour map as a facilitator for the data visualization. The thermal behavior was discussed correlating three properties of the compounds: basicity and HOMO-LUMO orbitals of the lanthanides, and the strength of each bond in the molecule. The gaseous products released during the thermal decomposition were: NH3/N2H4, CO2, CO, N2O and an aliphatic compound in air atmosphere; NH3/N2H4, CO2, CO, an unknown compound (two bands between 1200-1100 cm(-1)), and an unsaturated ketone or a mixture of unsaturated hydrocarbon and a ketone in nitrogen atmosphere. The compounds presented an amorphous halo, except holmium; the ligand binds through the tetrazole ring and the carboxylate group binds the lanthanide in monodentate mode; finally, the degree of covalence of the Eu, Dy, and Ho complexes were determined.
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Palavras-chave
Lanthanides, Valsartan, Thermal behavior, Evolved gas analysis
Como citar
Thermochimica Acta. Amsterdam: Elsevier, v. 686, 7 p., 2020.