| Full text | |
| 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) | |