Síntese, caracterização e estudo das propriedades fotoluminescentes de carboxilatos de lantanídeos derivados do anti-inflamatório ibuprofeno

• Autor(a) principal: França, Tatiane Corrêa de Oliveira
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/15839
• topic: Lanthanides; carboxylate ligands; photoluminescence; Lantanídeos; ligantes carboxilatos; fotoluminescência; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA

Coordination compounds of lanthanides have been the focus of many studies in the last decades, especially because it can became to a wealth complex materials with specific physical-chemistry properties and specific functions. In this context, the carboxilates with nitrogen ligands, show great potential as candidates for Light Conversor Molecular Devices (DMCLs). In this way, this work presents the synthesis, structural characterization and photoluminescent study of fifteen (15) novel compounds of Eu3+, Tb3+, Gd3+ , containing the non-steroidal anti-inflammatory drug ibuprofen and ancillary ligands 2,2 - bipiridina (bpy), 1,10- phenanthroline(phen), 4,4 -dimethil-2,2 -bipyridine (4,4 -dmbpy) e 5,5 -dimethil-2,2 -bipyridine (5,5 -dmbpy). Mononuclear complexes exhibit the general formulas [Ln(Ibf)3(H2O)2] (1 3) (Ln = Eu3+ 1, Gd3+ 2 e Tb3+ 3), while binuclear complexes exhibit the general formulas [Ln2(Ibf)6(bpy)2] (4 6) (Ln = Eu3+ 4, Gd3+ 5 e Tb3+ 6), [Ln2(Ibf)6(phen)2] (7 9) (Ln = Eu3+ 7, Gd3+ 8 e Tb3+ 9), [Ln2(Ibf)6(4,4 -dmbpy)2] (10 12) (Ln = Eu3+ 10, Gd3+ 11 e Tb3+ 12) e [Ln2(Ibf)6(5,5 -dmbpy)2] (13 15) (Ln = Eu3+ 13, Gd3+ 14 e Tb3+ 15). An efficient light transfer process ligand → Ln3+ was found, through the photoluminescence study, mainly for binuclear compounds. With the theoretical values of intramolecular energy transfer, by the RM1 model, it was verified that the energy transfer mainly occur through the lowest energy T1 state of the system to 5D1 e 5D0 states of Eu3+ ion. Furthermore, the substitution of coordenated water molecules in 1 by N,N-donors ligands bpy, phen, 4,4 -dmbpy e 5,5 -dmbpy, promoted the generation of binuclear complexes with 3-fold (4 6) and 4-fold (7 15) increase in quantum efficiency (η). Summarizing, the binuclear complexes sinthesized in this work can be excellent options for biomarkers and photoluminescent devices