Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/21008
Title: | Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron-phonon coupling |
Author: | Lahoud, M. G. Frem, R. C. G. Galico, D. A. Bannach, G. Nolasco, M. M. Ferreira, R. A. S. Carlos, L. D. |
Keywords: | TEMPERATURE-MEASUREMENTS SENSITIZED LUMINESCENCE TRIVALENT LANTHANIDES EUROPIUM(III) IONS SOLID KETOPROFEN IN-VITRO COMPLEXES FLUORESCENCE LINEWIDTH LIFETIMES |
Issue Date: | 2016 |
Publisher: | ELSEVIER SCIENCE BV |
Abstract: | Lanthanide-based coordination compounds of molecular formula [Ln(keto)(3)(H2O)], where Ln=Gd, Eu and keto=ketoprofen, were synthesized and their photoluminescence features were detailed in the 12-300 K interval. The emission spectra of [Eu(keto)(3)(H2O)] reveal a strong dependence with the temperature, well-illustrated by an unusual large blue-shift (similar to 17 cm(-1)) of the D-5(0)-> F-7(0) transition as the temperature is raised. The arithmetic difference between the absorption spectrum of [Eu(keto)(3)(H2O)] with that of [Gd(keto)(3)(H2O)] pointed out the presence of a ligand-to-metal charge transfer (LMCT) band (320-370 nm). From the [Gd(keto)(3)(H2O)] phosphorescence the energy of the keto-related triplet states was determined showing a large overlap with the intra-4f(6) levels and a strong electron-phonon coupling. The high-resonance between the LMCT and triplet states and the Eu3+ levels leads to a strong dependence of the D-5(0) lifetime value, typical of the presence of operative energy transfer processes. (C) 2015 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/21008 |
DOI: | 10.1016/j.jlumin.2015.08.050 |
ISSN: | 0022-2313 |
Publisher Version: | 10.1016/j.jlumin.2015.08.050 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron-phonon coupling_10.1016j.jlumin.2015.08.050.pdf | 1.46 MB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.