Rare-earth metal compounds with a novel ligand 2-methoxycinnamylidenepyruvate: A thermal and spectroscopic approach

Carvalho, Cláudio Teodoro de; Oliveira, Giulyane Felix de; Fernandes, José A.; Siqueira, A. B.; Ionashiro, E. Y.; Ionashiro, Massao

doi:10.1016/j.tca.2016.05.008

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…Luminescent lanthanide compounds have been widely used in various fields, such as fluorescence materials [ 1 , 2 , 3 ], electroluminescence devices [ 4 , 5 ], fluorescence probes and labels in biological systems [ 6 , 7 , 8 , 9 ], because they have the advantages of narrow emission bands, long fluorescence lifetimes and large Stokes shifts [ 10 , 11 , 12 , 13 , 14 ]. However, because of the parity rule, the f–f transition of lanthanide ions is forbidden, which leads to their weak luminescence intensities [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Composition of Lanthanide Complexes on Their Luminescence Enhancement by Ag@SiO2 Core-Shell Nanoparticles

Wang

Yue

et al. 2018

Nanomaterials

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Metal-enhanced luminescence of lanthanide complexes by noble metal nanoparticles has attracted much attention because of its high efficiency in improving the luminescent properties of lanthanide ions. Herein, nine kinds of europium and terbium complexes—RE(TPTZ)(ampca)3·3H2O, RE(TPTZ)(BA)3·3H2O, RE(phen)(ampca)3·3H2O, RE(phen)(PTA)1.5·3H2O (RE = Eu, Tb) and Eu(phen)(BA)3·3H2O (TPTZ = 2,4,6-tri(2-pyridyl)-s-triazine, ampca = 3-aminopyrazine-2-carboxylic acid, BA = benzoic acid, phen = 1,10-phenanthroline, PTA = phthalic acid)—have been synthesized. Meanwhile, seven kinds of core-shell Ag@SiO2 nanoparticles of two different core sizes (80–100 nm and 40–60 nm) and varied shell thicknesses (5, 12, 20, 30 and 40 nm) have been prepared. The combination of these nine types of lanthanide complexes and seven kinds of Ag@SiO2 nanoparticles provides an opportunity for a thorough investigation of the metal-enhanced luminescence effect. Luminescence spectra analysis showed that the luminescence enhancement factor not only depends on the size of the Ag@SiO2 nanoparticles, but also strongly relates to the composition of the lanthanide complexes. Terbium complexes typically possess higher enhancement factors than their corresponding europium complexes with the same ligands, which may result from better spectral overlap between the emission bands of Tb complexes and surface plasmon resonance (SPR) absorption bands of Ag@SiO2. For the complexes with the same lanthanide ion but varied ligands, the complexes with high enhancement factors are typically those with excitation wavelengths located nearby the SPR absorption bands of Ag@SiO2 nanoparticles. These findings suggest a combinatorial chemistry strategy is necessary to obtain an optimal metal-enhanced luminescence effect for lanthanide complexes.

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