Author(s): Ekawa, Bruno [UNESP] ; Sobral Carvalho, Ana Carina [UNESP] ; Fernandes, Richard Perosa [UNESP] ; Carneiro Soares do Nascimento, Andre Luiz [UNESP] ; Caires, Flavio Junior [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/195328
Origin: Oasisbr
Subject(s): Lanthanides; Valsartan; Thermal behavior; Evolved gas analysis
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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.
Univ Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP, Brazil
Univ Estadual Paulista, Fac Ciencias, BR-17033260 Bauru, SP, Brazil
Univ Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP, Brazil
Univ Estadual Paulista, Fac Ciencias, BR-17033260 Bauru, SP, Brazil
FAPESP: 2013/09022-7
FAPESP: 2017/14936-9
FAPESP: 2018/12463-9
FAPESP: 2018/24378-6
CNPq: 143246/2017-8
CNPq: 421469/2016-1
CAPES: 001
