Theoretical and experimental spectroscopic studies of the first highly luminescent binuclear hydrocinnamate of Eu(III), Tb(III) and Gd(III) with bidentate 2,2 '-bipyridine ligand


Autoria(s): Marques, Lippy F.; Correa, Charlane C.; Garcia, Humberto C.; Francisco, Thiago Martins; Ribeiro, Sidney José Lima; Dutra, Jose Diogo L.; Freire, Ricardo O.; Machado, Flavia C.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

03/12/2014

03/12/2014

01/04/2014

Resumo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

In this paper, the synthesis of three new binuclear lanthanide (III) complexes [Ln(2)(cin)(6)(bpy)(2)] (Ln=Eu (1), Tb (2), Gd (3), cin=hydrocinnamate anion; bpy=2,2'-bipyridine), and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermal analysis (TGA/DTA) are reported. In especial, photophysical properties of Eu(III) complex have been studied in detail via both theoretical and experimental approaches. Crystal structures of 1-3 reveal that all compounds are isostructural and that each lanthanide ion is nine-coordinated by oxygen and nitrogen atoms in an overall distorted tricapped trigonal-prismatic geometry. Eu(III) complex structure was also calculated using the Sparkle model for lanthanide complexes and the intensity parameters (Omega(2), Omega(4), and Omega(6)), calculated from the experimental data and from Sparkle/PM3 model. The theoretical emission quantum efficiencies obtained for Sparkle/PM3 structures are in excellent agreement with the experimental values, clearly attesting to the efficacy of the theoretical models. The theoretical procedure applied here shows that the europium binuclear compound displays a quantum yield about 65% suggesting that the system can be excellent for the development of efficient luminescent devices. (C) 2013 Elsevier By. All rights reserved.

Formato

307-316

Identificador

http://dx.doi.org/10.1016/j.jlumin.2013.12.021

Journal Of Luminescence. Amsterdam: Elsevier Science Bv, v. 148, p. 307-316, 2014.

0022-2313

http://hdl.handle.net/11449/111451

10.1016/j.jlumin.2013.12.021

WOS:000337516000053

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Journal of Luminescence

Direitos

closedAccess

Palavras-Chave #Lanthanides #Hydrocinnamic acid #Photophysical studies
Tipo

info:eu-repo/semantics/article