A influência da auto-organização da difenilalanina (ff) na fotofísica de sistemas ff/fluoróforos: uma abordagem teórico-prática

Detalhes bibliográficos
Ano de defesa: 2017
Autor(a) principal: Ribeiro, Antonio Carlos Chaves lattes
Orientador(a): Martins, Tatiana Duque lattes
Banca de defesa: Martins, Tatiana Duque, Custodio, Rogério, Talhavini, Márcio, Oliveira, Anselmo Elcana de, Alonso, Christian Gonçalves
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Goiás
Programa de Pós-Graduação: Programa de Pós-graduação em Química (IQ)
Departamento: Instituto de Química - IQ (RG)
País: Brasil
Palavras-chave em Português:
Palavras-chave em Inglês:
Área do conhecimento CNPq:
Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/7909
Resumo: Nanostructures of diphenylalanine (FF) have been extensively studied and are quite varied. This work aims to obtain self-assembled structures of diphenylalanine, containing electroluminescent compounds, with distinct morphological and photophysical characteristics from those of the starting materials. This work also intent to describe the photophysical properties of the structures obtained, integrating the experimental information to the theoretical predictions of computational simulations. For this, FF were self-assembled having chromophores as additives and its photophysical properties determined by steady state fluorescence spectroscopy, time-resolved fluorescence spectroscopy and its morphology was studied by scanning electron microscopy. Experimental data were compared to the results of semi-empiric theoretical calculation performed by AM1 and ZINDO/S approaches. The resulting materials exhibit different time resolved and steady state fluorescence response from the starting materials and it is related to charge transfer complexes formation. On theoretical approach, dimers and trimers can be part of the early stages of self-assembling. This find is important because this type of arrangement can lead to more conductive materials, of industrial interest, when combined with luminescent materials, especially if considered for energy conversion devices.