Estudo das propriedades fotoluminescentes de hidrocinamatos de Eu3+ e Gd3+ contendo ligantes N,N-bidentados e N,N,N-tridentado

• Ano de defesa: 2021
• Autor(a) principal: Oliveira, Guilherme Lessa dos Santos
• Outros Autores: [e-mail]
• Orientador(a): Marques, Lippy Faria
• Banca de defesa: Souza, Leonardo Aparecido de , Machado, Flávia Cavalieri
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Química
• Departamento: Centro de Tecnologia e Ciências::Instituto de Química
• País: Brasil
• Palavras-chave em Português: Lantanídeos; Luminescência; Complexos; Ácido hidrocinâmico; Fotoluminescência; Metais de terras raras
• Palavras-chave em Inglês: Lanthanides; Luminescence; Complexes; Hydrocinnamic acid
• Área do conhecimento CNPq: CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/17728

The study on lanthanide ions coordination compounds has become increasingly explored, due to its enormous variety of applications, be they catalytic, biological, magnetic, optical, among others. One of the main characteristics of lanthanide coordination compounds is their photoluminescent property and, thus, these compounds have enormous potential to act as Light Converting Molecular Devices (DMCLs). Therefore, the present work proposes the synthesis, structural characterization and photoluminescent study of six coordination compounds of lanthanides (Eu3+ and Gd3+) derived from hydrocinnamic acid and containing ancillary ligands, such as: 4,4'-dimethyl-2,2'-bipyridine (4,4'-dmbpy), batophenanthroline (bath) and 2,2’:6’,2’’-terpiridine (terpy). Such compounds were synthesized and properly characterized by techniques: elementary analysis (% C, H, N), infrared spectroscopy (FTIR) and X-ray diffraction using the polycrystalline method. The photophysical study of the Eu3+ complexes were obtained through excitation and emission spectra (295 and 77 K), Eu3+ lifetime of the emitting state and phosphorescence of the respective Gd3+ compounds. The energy transfer process was completely elucidated by obtaining theoretical calculations by the SPARKLE method, providing the energy transfer and back-transfer rates between the different energy levels in such compounds. Additionally, a structure-photoluminescence relationship of the studied compounds can be obtained, evidenced by the values of the parameters of the 2 and 4 experimental intensities (Judd-Ofelt parameters).