Solid state photoluminescence studies of [EuLn H2(NO3)3](H2O)x macrocyclic complexes with Schiff base ligands
Nenhuma Miniatura disponível
Data
2018
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Three EuIII macrocyclic complexes [EuLn
H2(NO3)3](H2O)x based on the ligands derived from 2-hydroxy-5-
methyl-1,3-benzenedicarbaldehyde and three different amines: o-phenylenediamine, Eu-OPDA; ethylenediamine, Eu-EDA; and 1,3-diaminopropane, Eu-DAP have been synthesized via a metal template reaction. EuEDA and Eu-DAP showed metal based emission; for the Eu-OPDA complex these luminescent properties were
not observed. From the photoluminescence emission measurements from ~13 to 300 K, the R/O = I (5
D0 → 7
F2)/I (5
D0 → 7
F1) ratio, together with two intensity parameters (Ω2 and Ω4), radiative lifetimes (τR) and
branching ratios (β0 J′) were calculated based on the Judd-Ofelt theory, for Eu-EDA and Eu-DAP. While the
behavior of these parameters for the Eu-DAP complex is temperature dependent, these remain constant for EuEDA. The temperature dependence observed for the Eu-DAP complex indicates that for temperatures below
120 K, the local symmetry of the EuIII center is modified, as compared to the environment of the same metal
center at room temperature.
Descrição
Palavras-chave
EuIII complexes, Macrocyclic ligands, Luminescence, Judd-Ofelt parameters
Citação
SANTANA, Ricardo C. de et al. Solid state photoluminescence studies of [EuL n H 2 (NO 3 ) 3 ](H 2 O) x macrocyclic complexes with Schiff base ligands. Journal of Luminescence, Amsterdam, v. 203, p. 7-15, 2018. DOI: 10.1016/j.jlumin.2018.06.022. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022231318300048. Acesso em: 1 fev. 2024.