| Full text | |
| Author(s): |
Ekawa, Bruno
[1]
;
Sobral Carvalho, Ana Carina
[1]
;
Fernandes, Richard Perosa
[1]
;
Carneiro Soares do Nascimento, Andre Luiz
[1]
;
Caires, Flavio Junior
[1, 2]
Total Authors: 5
|
| Affiliation: | [1] Univ Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP - Brazil
[2] Univ Estadual Paulista, Fac Ciencias, BR-17033260 Bauru, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Thermochimica Acta; v. 686, APR 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 13/09022-7 - Thermoanalytical studies, synthesis and characterization of the solid co-crystals of antibiotics (fluoroquinolones) with some co-formers |
| Grantee: | Massao Ionashiro |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/24378-6 - Synthesis, characterization and thermoanalytical study of Valsartan, Candesartan Cilexetil and Olmesartan medoxomil co-crystals |
| Grantee: | Flávio Junior Caires |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/14936-9 - Preparation, characterization and thermoanalytical studies of heterogeneous catalysts of double selenates of Mg/Co and Mg/Cu in biodiesel production using different oils |
| Grantee: | Massao Ionashiro |
| Support Opportunities: | Regular Research Grants |