Synthesis, thermoanalytical, spectroscopic study and pyrolysis of solid rare earth complexes (Eu, Gd, Tb and Dy) with p-aminobenzoic acid

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dc.contributor.authorTeixeira, J. A. [UNESP]
dc.contributor.authorNunes, W. D.G. [UNESP]
dc.contributor.authorDo Nascimento, A. L.C.S. [UNESP]
dc.contributor.authorColman, T. A.D.
dc.contributor.authorCaires, F. J. [UNESP]
dc.contributor.authorGálico, D. A.
dc.contributor.authorIonashiro, M. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUFGD - Univ. Federal da Grande Dourados
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2018-12-11T17:29:48Z
dc.date.available2018-12-11T17:29:48Z
dc.date.issued2016-09-01
dc.description.abstractSynthesis, thermoanalytical, spectroscopic study and pyrolysis of some solid-state rare earth complexes with p-aminobenzoic acid (Eu, Gd, Tb and Dy) were performed. All the synthesized complexes were obtained as monohydrated state and the thermal decomposition in dynamic dry air atmosphere occurs in two, three or four steps with the formation of the respective oxides, Tb4O7 and Ln2O3 (Ln = Eu, Gd and Dy). In dynamic dry nitrogen atmosphere, the thermal decomposition occurs in three or four consecutive and/or overlapping steps and the mass loss are still being observed up to 1000 °C. The DSC curves in nitrogen atmosphere show that all complexes presented a reversible phase transition. EGA results permitted to identify the gaseous products released during pyrolysis and thermal oxidation of the complexes. The spectroscopic study provided information about vibrational and electronic transitions of the complexes. Middle and near infrared region provided information about the vibrational modes and the ligand's denticity in these complexes. Moreover, near infrared spectra together with ultraviolet and visible spectra (diffuse reflectance) provided information regarding the 4f-4f transitions of the rare earth ions. The arithmetic difference between the diffuse reflectance spectra in the solid state of the europium(III) and gadolinium(III) complexes reveals the presence of a ligand-to-metal (O2- → Eu3+) charge transfer (LMCT) in the 305-470 nm range.en
dc.description.affiliationInstituto de Química UNESP - Univ. Estadual Paulista
dc.description.affiliationFaculdade de Ciências Exatas e Tecnologia - FACET UFGD - Univ. Federal da Grande Dourados
dc.description.affiliationFaculdade de Ciências UNESP Campus Bauru
dc.description.affiliationInstituto de Química UNICAMP - Univ. Estadual de Campinas
dc.description.affiliationUnespInstituto de Química UNESP - Univ. Estadual Paulista
dc.description.affiliationUnespFaculdade de Ciências UNESP Campus Bauru
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2013/09022-7
dc.format.extent267-274
dc.identifierhttp://dx.doi.org/10.1016/j.jaap.2016.08.006
dc.identifier.citationJournal of Analytical and Applied Pyrolysis, v. 121, p. 267-274.
dc.identifier.doi10.1016/j.jaap.2016.08.006
dc.identifier.file2-s2.0-84990857414.pdf
dc.identifier.issn0165-2370
dc.identifier.scopus2-s2.0-84990857414
dc.identifier.urihttp://hdl.handle.net/11449/178331
dc.language.isoeng
dc.relation.ispartofJournal of Analytical and Applied Pyrolysis
dc.relation.ispartofsjr1,129
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectEvolved gases
dc.subjectPyrolysis
dc.subjectRare earth complexes
dc.subjectSpectroscopy
dc.subjectThermal behavior
dc.titleSynthesis, thermoanalytical, spectroscopic study and pyrolysis of solid rare earth complexes (Eu, Gd, Tb and Dy) with p-aminobenzoic aciden
dc.typeArtigo

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