Propriedades Luminescentes de Compostos de Coordenação Formados com Ligantes Imínicos e Lantanídeos
Data
2022-12-15
Autores
Fernandes, Nathália Maria Moraes 
Orientadores
Bagatin, Izilda Aparecida
Tipo
Dissertação de mestrado
Título da Revista
ISSN da Revista
Título de Volume
Resumo
No presente trabalho foram feitas sínteses de novos compostos de
coordenação baseados em ligantes derivados quinolínicos e suas propriedades
luminescentes. Com base nisso, seis compostos de coordenação foram obtidos
a partir dos ligantes 5-SO3H-8-hidroxiquinolina (8-HQS) e o ácido 2-(4-
hidroxiazobenzeno)benzóico (HABA), e dos sais metálicos com íons
lantanídeos, Eu(CF3SO)3 e Tb(CF3SO)3. Foram realizadas algumas
caracterizações, utilizando as técnicas de RMN, FTIR, UV-Vis e
fotoluminescência. Nos complexos obtidos com Eu3+ e Tb3+ os estiramentos das
frequências no FTIR, características dos ligantes 8-HQS e HABA (C=N em
1607 cm-1 e 1599 cm-1 respectivamente), foram deslocadas para frequência
menores, cerca de 2 a 37 cm-1 para os compostos de Eu3+ e de 2 a 31 cm-1 para
os compostos de Tb3+
. Por sua vez, os espectros de emissão mostram bandas
em 614 nm, 615 nm e 616 nm para os compostos contendo Eu3+, os quais são
característicos da transição 5D0→7F2 (permitida por dipolo elétrico) do Eu3+, e as
bandas em 542 nm, 546 nm e 540 nm para os compostos contendo Tb3+
,
característicos da transição 5D4→7F5 do Tb3+
.
New coordination compounds based on quinoline derivatives ligands were synthetized in this work, and their luminescent proprieties were performed. Then, six coordination compounds were obtained from the 5-SO3H-8-hydroxyquinoline (8-HQS) and 2-(4-hydroxyazobenzene)benzoic acid (HABA) ligands, and Eu(CF3SO)3 and Tb(CF3SO)3. metal salts. Spectroscopic characterizations were performed using NMR, FTIR, UV-vis, and photoluminescence techniques. The complexes with Eu3+ and Tb3+ , presents shift of the characteristics bands on FTIR frequencies from ligands 8-HQS and HABA ((C=N at 1607 cm-1 and 1599 cm-1 respectively), were shifted from 2 to 37 cm-1 for Eu3+ compounds and from 2 to 31 cm-1 for Tb3+ compounds. Afterward, emission spectra depicted bands at 614 nm, 615 nm, and 616 nm for europium compounds, respectively characteristic of the 5D0→7F2 transition (dipole electric allowed) from Eu3+ ion and 542 nm, 546 nm and 540 nm for the terbium compounds, characteristic of the 5D4→7F5 transition from Tb3+ ion.
New coordination compounds based on quinoline derivatives ligands were synthetized in this work, and their luminescent proprieties were performed. Then, six coordination compounds were obtained from the 5-SO3H-8-hydroxyquinoline (8-HQS) and 2-(4-hydroxyazobenzene)benzoic acid (HABA) ligands, and Eu(CF3SO)3 and Tb(CF3SO)3. metal salts. Spectroscopic characterizations were performed using NMR, FTIR, UV-vis, and photoluminescence techniques. The complexes with Eu3+ and Tb3+ , presents shift of the characteristics bands on FTIR frequencies from ligands 8-HQS and HABA ((C=N at 1607 cm-1 and 1599 cm-1 respectively), were shifted from 2 to 37 cm-1 for Eu3+ compounds and from 2 to 31 cm-1 for Tb3+ compounds. Afterward, emission spectra depicted bands at 614 nm, 615 nm, and 616 nm for europium compounds, respectively characteristic of the 5D0→7F2 transition (dipole electric allowed) from Eu3+ ion and 542 nm, 546 nm and 540 nm for the terbium compounds, characteristic of the 5D4→7F5 transition from Tb3+ ion.
Descrição
Citação
FERNANDES, Nathália Maria M. Dissertação de Mestrado, UNIFESP, 2022