Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.tca.2015.11.023 http://hdl.handle.net/11449/172459 |
Resumo: | The characterization, thermal stability and thermal decomposition of some lighter trivalent lanthanide p-aminobenzoates, Ln(C7H6NO2)3·H2O (Ln = La, Ce, Pr, Nd, Sm), as well as the thermal behavior and spectroscopic study of p-aminobenzoic acid C7H7NO2 and its sodium salt were investigated. The following methods were utilized: simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in dynamic dry air and nitrogen atmospheres; differential scanning calorimetry (DSC); middle (MIR) and near (NIR) infrared region spectroscopy; evolved gas analysis (EGA); elemental analysis; complexometry; X-ray diffraction (XRD); and diffuse reflectance spectroscopy (DR) in the ultraviolet and visible regions. All the compounds were obtained monohydrated and the thermal decomposition occurred in two, three or four steps in an air atmosphere, and three or four steps in N2 atmosphere. In both atmospheres (air and N2) the final residues were CeO2, Pr6O11, Ln2O3 (Ln = La, Nd, Sm). The results also provided information concerning the coordination mode and thermal behavior, as well as the identification of the gaseous products which evolved during the thermal decomposition of these compounds. The DR and NIR spectra provided information about the ligand absorption bands and the f-f transitions of the Nd3+, Pr3+ and Sm3+ ions. |
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Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanidesEvolved gasesLighter trivalent lanthanidesp-AminobenzoatesSpectroscopyThermal behaviorThe characterization, thermal stability and thermal decomposition of some lighter trivalent lanthanide p-aminobenzoates, Ln(C7H6NO2)3·H2O (Ln = La, Ce, Pr, Nd, Sm), as well as the thermal behavior and spectroscopic study of p-aminobenzoic acid C7H7NO2 and its sodium salt were investigated. The following methods were utilized: simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in dynamic dry air and nitrogen atmospheres; differential scanning calorimetry (DSC); middle (MIR) and near (NIR) infrared region spectroscopy; evolved gas analysis (EGA); elemental analysis; complexometry; X-ray diffraction (XRD); and diffuse reflectance spectroscopy (DR) in the ultraviolet and visible regions. All the compounds were obtained monohydrated and the thermal decomposition occurred in two, three or four steps in an air atmosphere, and three or four steps in N2 atmosphere. In both atmospheres (air and N2) the final residues were CeO2, Pr6O11, Ln2O3 (Ln = La, Nd, Sm). The results also provided information concerning the coordination mode and thermal behavior, as well as the identification of the gaseous products which evolved during the thermal decomposition of these compounds. The DR and NIR spectra provided information about the ligand absorption bands and the f-f transitions of the Nd3+, Pr3+ and Sm3+ ions.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Instituto de Química UNESP - Universidade Estadual Paulista Campus Araraquara Departamento de Química AnalíticaFaculdade de Ciências UNESP - Universidade Estadual Paulista Campus Bauru Departamento de QuímicaInstituto Federal de Educação Ciência e Tecnologia de Mato GrossoInstituto de Química UNICAMP - Universidade Estadual de CampinasInstituto de Química UNESP - Universidade Estadual Paulista Campus Araraquara Departamento de Química AnalíticaFaculdade de Ciências UNESP - Universidade Estadual Paulista Campus Bauru Departamento de QuímicaFAPESP: 2013/09022-7Universidade Estadual Paulista (Unesp)Ciência e Tecnologia de Mato GrossoUniversidade Estadual de Campinas (UNICAMP)Teixeira, J. A. [UNESP]Nunes, W. D.G. [UNESP]Colman, T. A.D. [UNESP]Do Nascimento, A. L.C.S. [UNESP]Caires, F. J. [UNESP]Campos, F. X. [UNESP]Gálico, D. A.Ionashiro, M. [UNESP]2018-12-11T17:00:26Z2018-12-11T17:00:26Z2016-01-20info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article59-68application/pdfhttp://dx.doi.org/10.1016/j.tca.2015.11.023Thermochimica Acta, v. 624, p. 59-68.0040-6031http://hdl.handle.net/11449/17245910.1016/j.tca.2015.11.0232-s2.0-849555130412-s2.0-84955513041.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengThermochimica Acta0,605info:eu-repo/semantics/openAccess2024-04-29T18:17:00Zoai:repositorio.unesp.br:11449/172459Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:28:33.934639Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
title |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
spellingShingle |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides Teixeira, J. A. [UNESP] Evolved gases Lighter trivalent lanthanides p-Aminobenzoates Spectroscopy Thermal behavior |
title_short |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
title_full |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
title_fullStr |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
title_full_unstemmed |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
title_sort |
Thermal and spectroscopic study to investigate p-aminobenzoic acid, sodium p-aminobenzoate and its compounds with some lighter trivalent lanthanides |
author |
Teixeira, J. A. [UNESP] |
author_facet |
Teixeira, J. A. [UNESP] Nunes, W. D.G. [UNESP] Colman, T. A.D. [UNESP] Do Nascimento, A. L.C.S. [UNESP] Caires, F. J. [UNESP] Campos, F. X. [UNESP] Gálico, D. A. Ionashiro, M. [UNESP] |
author_role |
author |
author2 |
Nunes, W. D.G. [UNESP] Colman, T. A.D. [UNESP] Do Nascimento, A. L.C.S. [UNESP] Caires, F. J. [UNESP] Campos, F. X. [UNESP] Gálico, D. A. Ionashiro, M. [UNESP] |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Ciência e Tecnologia de Mato Grosso Universidade Estadual de Campinas (UNICAMP) |
dc.contributor.author.fl_str_mv |
Teixeira, J. A. [UNESP] Nunes, W. D.G. [UNESP] Colman, T. A.D. [UNESP] Do Nascimento, A. L.C.S. [UNESP] Caires, F. J. [UNESP] Campos, F. X. [UNESP] Gálico, D. A. Ionashiro, M. [UNESP] |
dc.subject.por.fl_str_mv |
Evolved gases Lighter trivalent lanthanides p-Aminobenzoates Spectroscopy Thermal behavior |
topic |
Evolved gases Lighter trivalent lanthanides p-Aminobenzoates Spectroscopy Thermal behavior |
description |
The characterization, thermal stability and thermal decomposition of some lighter trivalent lanthanide p-aminobenzoates, Ln(C7H6NO2)3·H2O (Ln = La, Ce, Pr, Nd, Sm), as well as the thermal behavior and spectroscopic study of p-aminobenzoic acid C7H7NO2 and its sodium salt were investigated. The following methods were utilized: simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in dynamic dry air and nitrogen atmospheres; differential scanning calorimetry (DSC); middle (MIR) and near (NIR) infrared region spectroscopy; evolved gas analysis (EGA); elemental analysis; complexometry; X-ray diffraction (XRD); and diffuse reflectance spectroscopy (DR) in the ultraviolet and visible regions. All the compounds were obtained monohydrated and the thermal decomposition occurred in two, three or four steps in an air atmosphere, and three or four steps in N2 atmosphere. In both atmospheres (air and N2) the final residues were CeO2, Pr6O11, Ln2O3 (Ln = La, Nd, Sm). The results also provided information concerning the coordination mode and thermal behavior, as well as the identification of the gaseous products which evolved during the thermal decomposition of these compounds. The DR and NIR spectra provided information about the ligand absorption bands and the f-f transitions of the Nd3+, Pr3+ and Sm3+ ions. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01-20 2018-12-11T17:00:26Z 2018-12-11T17:00:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.tca.2015.11.023 Thermochimica Acta, v. 624, p. 59-68. 0040-6031 http://hdl.handle.net/11449/172459 10.1016/j.tca.2015.11.023 2-s2.0-84955513041 2-s2.0-84955513041.pdf |
url |
http://dx.doi.org/10.1016/j.tca.2015.11.023 http://hdl.handle.net/11449/172459 |
identifier_str_mv |
Thermochimica Acta, v. 624, p. 59-68. 0040-6031 10.1016/j.tca.2015.11.023 2-s2.0-84955513041 2-s2.0-84955513041.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Thermochimica Acta 0,605 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
59-68 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129072927080448 |