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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Novel luminescent Eu3+-indandionate complexes containing heterobiaryl ligands

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Author(s):
Resende Filho, Joao B. M. [1] ; Silva, Jannine C. [1] ; Vale, Juliana A. [1] ; Brito, Hermi F. [2] ; Faustino, Wagner M. [1] ; Espinola, Jose G. P. [1] ; Felinto, Maria C. F. C. [3] ; Teotonio, Ercules E. S. [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Paraiba, Dept Quim, BR-58051970 Joao Pessoa, PB - Brazil
[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508900 Sao Paulo - Brazil
[3] Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 25, n. 11, p. 2080-2087, NOV 2014.
Web of Science Citations: 3
Abstract

Novel Ln3+-indandionate complexes of formulas [Ln(aind)3L(H2O)] and [Ln(bind)3L]∙H2O (L: 1,10-phenanthroline (phen) or 4,7-dimethyl-1,10-phenanthroline (dmphen), Ln3+: Eu3+ or Gd3+, aind: 2-acetyl-1,3-indandionate and bind: 2-benzoyl-1,3-indandionate) were synthesized and characterized by elemental analysis, infrared spectroscopy, and thermogravimetric analyses. The characterization data are consistent with the presence of a water lattice molecule in the [Ln(bind)3L]∙H2O compounds. However, the data also suggest that the water acts as a coordinated molecule in the [Ln(aind)3L(H2O)] ones. Theoretical geometries of the Eu3+-complexes have been optimized via the SPARKLE/AM1 Model for lanthanide complexes that are consistent with their luminescence experimental data. The photoluminescence properties of the Eu3+-compounds have been discussed in terms of experimental intensity parameters (Ω2 and Ω4), radiative (Arad), and non-radiative (Anrad) spontaneous emission coefficients. The higher values of emission quantum efficiency (η) of the [Eu(bind)3L]∙H2O compounds reflect the absence of luminescence-quenching water molecule in their first coordination spheres. (AU)