Artículos de revistas
Photophysical Properties Of Asymmetric And Water-soluble Dinuclear Lanthanide Complexes Of Poly Glycol Chain Functionalized-benzoic Acid Derivative: Experimental And Theoretical Approaches
Registro en:
Rsc Advances. Royal Soc Chemistry, v. 6, p. 101133 - 101141, 2016.
2046-2069
WOS:000387427700055
10.1039/c6ra21487h
Autor
Bosshard
G. Z.; Brito
G. A.; Monteiro
J. H. S. K.; de Bettencourt-Dias
A.; Mazali
I. O.; Sigoli
F. A.
Institución
Resumen
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) New water-soluble lanthanide complexes with a poly glycol chain (-OEtOEtOEtOMe) functionalized benzoic acid derivative ligand were synthesized and photophysically characterized. The results indicate a formation of an asymmetric dinuclear lanthanide complexes. The [Eu-2(mee)(6)(H2O)(2)]complex shows emission in water solution and it was noted that after 48 h part of the ligands are replaced by water molecules resulting on quenching of the emission and decreasing of lifetimes by O-H oscillators from water molecules. The average Judd-Ofelt intensity parameters were determined experimentally from emission spectra of the europium(III) complex. Additionally, the contribution of each asymmetric europium(III) center to the JO intensity parameters were calculated independently using time resolved spectroscopy and the LUMPAC software helping the proposition of the polyhedral coordination sphere determined by the ground state geometry using the Sparkle/PM3 model. The transfer and back energy transfer rates were also calculated. The values obtained for energy transfer rates are lower than previous values obtained for europium(III) complexes with benzoic acid derivative ligands, indicating the role of the poly glycol chain on photophysical properties of the [Eu-2(mee)(6)(H2O)(2)] complex. 6 103 101133 101141 CAPES FAPESP [2015/22426-5, 2013/22127-2] CNPq [159249/2014-7] MEC/MCTI/CNPq/CAPES PEV program [400214/2014-8] NSF [CHE-1363325] Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)