Journal
THERMOCHIMICA ACTA
Volume 686, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tca.2020.178532
Keywords
Lanthanides; Valsartan; Thermal behavior; Evolved gas analysis
Funding
- FAPESP [2013/09022-7, 2017/14936-9, 2018/12463-9, 2018/24378-6]
- CNPq [143246/2017-8, 421469/2016-1]
- CAPES [001]
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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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