Synthesis, thermoanalytical and spectroscopic studies of trivalent lanthanides (Eu-Ho) complexes with the valsartan ligand

Autor(es)

Ekawa, Bruno ^[1] ; Sobral Carvalho, Ana Carina ^[1] ; Fernandes, Richard Perosa ^[1] ; Carneiro Soares do Nascimento, Andre Luiz ^[1] ; Caires, Flavio Junior ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Inst Quim, CP 355, BR-14801970 Araraquara, SP - Brazil

^[2] Univ Estadual Paulista, Fac Ciencias, BR-17033260 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Thermochimica Acta; v. 686, APR 2020.
• Citações Web of Science: 0

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. (AU)

• Processo FAPESP: 13/09022-7 - Estudos termoanalíticos, síntese e caracterização dos co-cristais sólidos de alguns antibióticos (fluoroquinolonas) com alguns co-formadores
• Beneficiário: Massao Ionashiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/24378-6 - Síntese, caracterização e estudo termoanalítico de cocristais de Valsartana, Candesartana Cilexetila e Olmesartana medoxomila
• Beneficiário: Flávio Junior Caires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
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• Beneficiário: Massao Ionashiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular