Spectroscopic studies of an europium(III) tris-beta-diketonate complex bearing a pyrazolylpyridine ligand

abstract

A new europium(IR) complex, Eu(BTA)(3) (ethyl [3-(2-pyridyl)-1-pyrazolyl] acetate) (where BTA: 1-benzoyl-3,3,3-trifluoroacetonate), was synthesised by simple ligand exchange with the solvent adduct Eu(BTA)(3)(H2O)(2). The compound was characterised by elemental analysis, thermogravimetry, FTIR, FT Raman and photoluminescence spectroscopies. A significant increase of the D-5(0) lifetime of the complex, relative to the value found for the water-coordinated adduct (from 0.657 +/- 0.001 to 0.835 +/- 0.002 ms), and a larger contribution of the ligand levels to the excitation spectrum indicate a better photoluminescence performance for the former complex. (C) 2007 Elsevier B.V. All rights reserved.

subject category

Chemistry; Materials Science; Metallurgy & Metallurgical Engineering

authors

dos Santos, AM; Coelho, AC; Paz, FAA; Rocha, J; Goncalves, IS; Carlos, LD

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