Issue 27, 2016

Luminescent and magnetic materials with a high content of Eu3+-EDTA complexes

Abstract

Bifunctional optical magnetic materials with a high europium content have been prepared. Chelating groups were introduced on the Fe3O4 surface with organosilanes containing ethylenediaminetetraacetic acid (EDTA) derivatives, which were previously prepared via a reaction between EDTA-dianhydride and aminoalkoxysilane agents: 3-(trimethoxysilyl)propylamine (1N), N-[3(trimethoxysilyl)propyl]ethylenediamine (2N) and N1-(3-trimethoxysilylpropyl)diethylenetriamine) (3N). The first coordination sphere of Ln-EDTA complexes present on the modified surfaces of Fe3O4 particles was completed by addition of β-diketonate ligands (tta: thenoyltrifluoroacetone, dbm: dibenzoylmethane, bzac: benzoylacetone and acac: acetylacetone) in order to improve their luminescence properties. The materials were characterized by powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and wavelength dispersive X-ray fluorescence (WDXRF) and Fourier-transform infrared (FT-IR) spectroscopy as well as by zeta potential measurements and luminescence spectroscopy. The hybrid materials exhibited intense red emission, which can be assigned to the 4f–4f transitions of the Eu3+ ion, indicating an efficient intramolecular ligand-to-metal energy transfer. The experimental intensity parameters (Ω2 and Ω4), lifetimes (τ), as well as radiative (Arad) and non-radiative (Anrad) decay rates of the Eu3+ ion were determined and discussed. The strategies used to obtain these materials may contribute to the development of several bifunctional systems for practical applications.

Graphical abstract: Luminescent and magnetic materials with a high content of Eu3+-EDTA complexes

Supplementary files

Article information

Article type
Paper
Submitted
19 Jan 2016
Accepted
31 May 2016
First published
31 May 2016

Dalton Trans., 2016,45, 10960-10968

Luminescent and magnetic materials with a high content of Eu3+-EDTA complexes

G. P. Pires, I. F. Costa, H. F. Brito, W. M. Faustino and E. E. S. Teotonio, Dalton Trans., 2016, 45, 10960 DOI: 10.1039/C6DT00249H

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