Luminescence properties of the Ln–EDTA complexes covalently linked to the chitosan biopolymers containing β-diketonate as antenna ligands
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Luminescence
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This paper reports on the preparation, characterization, and photoluminescence
properties of novel hybrid materials, in which the EDTA–Ln–L complexes (where
L: H2O, acac, bzac, dbm, and tta ligands, and Ln: Eu, Gd, and Tb) were covalently
linked to the precursor medium molecular weight chitosan surface (CS) matrices or
on the chitosan surfaces previously crosslinked with epichlorohydrin (CSech). The
emission spectra of these materials were characterized by intraconfigurational-4fN
transitions centred on the Eu3+ and Tb3+ ions. Some broad bands from the polymeric
matrix were also observed in the emission spectra, however the relative intensities of
the intraconfigurational bands increased significantly for systems containing
diketonate ligands when the antenna effect became more efficient. The values of the
radiative rates (Arad) were higher for crosslinked hybrid systems with epichlorohydrin,
while nonradiative rates (Anrad) presented the opposite behaviour. These data contributed
to an increase in the values of emission quantum efficiency (η) for
crosslinked materials. The effect of the modification process and antenna ligand on
the values of intensities, intensity parameters Ω2 e Ω4 of the Eu3+ complexes were
also investigated. The results showed that the crosslinked biopolymer surfaces have
great potential for applications in molecular devices light converters.
Como referenciar
COSTA, ISRAEL F.; PIRES, GILVAN P.; ESPÍNOLA, JOSÉ G.P.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.; FAUSTINO, WAGNER M.; TEOTONIO, ERCULES E.S. Luminescence properties of the Ln–EDTA complexes covalently linked to the chitosan biopolymers containing β-diketonate as antenna ligands. Luminescence, v. 35, n. 3, p. 365-372, 2020. DOI: 10.1002/bio.3735. Disponível em: http://repositorio.ipen.br/handle/123456789/31392. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.