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dc.contributor.advisor1Machado, Flávia Cavalieri-
dc.contributor.advisor1Latteshttp://lattes.cnpq.brpt_BR
dc.contributor.referee1Rocha, William Ricardo-
dc.contributor.referee1Latteshttp://lattes.cnpq.brpt_BR
dc.contributor.referee2Tasso, Thiago Teixeira-
dc.contributor.referee2Latteshttp://lattes.cnpq.brpt_BR
dc.creatorQueiroz, Eduarda Couto-
dc.creator.Latteshttp://lattes.cnpq.brpt_BR
dc.date.accessioned2019-05-06T17:32:41Z-
dc.date.available2019-05-03-
dc.date.available2019-05-06T17:32:41Z-
dc.date.issued2019-02-27-
dc.identifier.urihttps://repositorio.ufjf.br/jspui/handle/ufjf/9904-
dc.description.abstractIn this work, the synthesis and characterization of new lanthanide complexes with betadicetonates, carboxylates and neutral nitrogenous ligands, that can possible act as Light Conversor Molecular Devices (DCMLs), were performed. Four series of compounds were obtained: Tb(III), Eu(III) and Gd(III) ions with 4,4,4-trifluoro-1-phenyl-1,3-butanedione (TFB) and terephthalic acid (TPA). These syntheses generated two different types of complexes: for Tb(III) the coordination occurred with only one of the ligands and Gd(III) complexed with the two ligands and then formed a monocrystal with the TFB. Using the Eu(III) ion, it was observed the formation of a complex with the two ligands. The other series of Tb(III) complexes synthetized with the ligands 2-tenoyltrifluoroacetone (HTTA) and terephthalic acid (TPA), presented coordination only with TPA. The third series of compounds that were obtained using Eu(III), Tb(III), Sm(III) and Gd(III) with 2-furoic acid (ACF) and 4,4-dimethyl-2,2-bipyridine (DBP) have a molecular formula of [Ln2C44H36O18N6]. The last series of compounds obtained by the coordination of 3-thiophene acetic acid (TIO) and 4,4-dimethyl-2,2-bipyridine with the ions Tb(III), Eu(III) and Gd(III) presented a molecular formula of [Ln2C60H60O12N4S6]. These complexes were characterized by infrared, Raman, elemental analysis and single crystal or powder X-ray diffraction. The luminescent properties of the complexes synthetized as the intensity parameters of Judd-Ofelt (for Eu(III) complexes), lifetime, radiative and non-radiative decay rate, and quantum efficiency were obtained by radiative decay curves and by the emission and excitation spectra of the complexes. The triplet state, T1, of the ligands was obtained by the time resolved phosphorescence spectrum of each Gd(III) complex. In addition, it was observed that the [Eu2C44H36O18N6] and the [Eu2C60H60O12N4S6] complexes have a quantum efficiency of 54.52 and 45.42%, respectively, suggesting that these complexes can act as luminescent devices.pt_BR
dc.description.resumoNeste trabalho realizou-se a síntese e caracterização de novos complexos de lantanídeos, com ligantes betadicetonatos, carboxilatos e nitrogenados neutro, com possível atuação como Dispositivos Moleculares Conversores de Luz (DCMLs). Foram obtidos quatro séries de compostos: os íons Tb(III), Eu(III) e Gd(III), com os ligantes 4,4,4-trifluoro-1-fenil-1,3-butanodiona (TFB) e ácido tereftálico (TPA), sendo que nesta síntese formaram-se dois complexos de Tb(III) e Gd(III) diferentes. Para o Tb(III) a coordenação ocorreu com apenas um dos ligantes e o Gd(III) complexou-se com os dois ligantes e formou monocristal com o TFB; enquanto que o complexo de Eu(III) foi formado com os dois ligantes. A outra série de complexos, com os ligantes 2-tenoiltrifluoroacetona (HTTA) e o ácido tereftálico com o Tb(III), apresentou coordenação apenas do TPA com o Tb(III). A terceira série de compostos foi obtida pela síntese do Eu(III), Tb(III), Sm(III) e Gd(III) com o ácido 2-furóico (ACF) e a 4,4-dimetil-2,2-bipiridina (DBP), de fórmula molecular [Ln2C44H36O18N6]. E a última série de compostos foi adquirida pela coordenação entre os ligantes ácido 3-tiofeno acético (TIO) e a 4,4-dimetil-2,2-bipiridina com os íons Tb(III), Eu(III) e Gd(III) de fórmula molecular [Ln2C60H60O12N4S6]. Esses complexos foram caracterizados por espectroscopias no infravermelho e Raman, análise elementar e difração de Raios X por monocristal ou policristal. As suas propriedades luminescentes e os parâmetros de intensidade de Judd-Ofelt (para os complexos de Eu(III)), tempo de vida, taxa de decaimento radiativo e não radiativo e eficiência quântica foram obtidos pelas curvas de decaimento radiativos e pelos espectros de emissão e excitação dos complexos. O estado tripleto, T1, dos ligantes, foi obtido pelo espectro de fosforescência resolvido no tempo dos complexos de Gd(III). Além disso, verificou-se que os complexos de [Eu2C44H36O18N6] e [Eu2C60H60O12N4S6] apresentam eficiência quântica de 54,52 e 45,42%, respectivamente, sugerindo assim que esses complexos possam atuar como dispositivos luminescentes.pt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal de Juiz de Fora (UFJF)pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICE – Instituto de Ciências Exataspt_BR
dc.publisher.programPrograma de Pós-graduação em Químicapt_BR
dc.publisher.initialsUFJFpt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectLantanídeopt_BR
dc.subjectLigantes carboxilatospt_BR
dc.subjectLigantes betadicetonadospt_BR
dc.subjectFotoluminescênciapt_BR
dc.subjectLanthanidespt_BR
dc.subjectCarboxylate ligandspt_BR
dc.subjectBetadicetonates ligandspt_BR
dc.subjectPhotoluminescencept_BR
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICApt_BR
dc.titleSíntese e caracterização de complexos de Eu(III), Tb(III), Sm(III) e Gd(III) com ligantes carboxilatos, betadicetonatos e nitrogenadospt_BR
dc.typeDissertaçãopt_BR
Appears in Collections:Mestrado em Química (Dissertações)



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