A new series of luminescent tetrakis Ln3+-complexes with α-substituted β-diketonate ligands and Na+ as countercation
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2021
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th
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The Ln3+ β-diketonate coordination compounds have received growing attention in the
past few years, mainly due to their inherent huge variety of applications. The tris and
tetrakis species have also been widely used as an emitting layer in organic light-emitting
diodes (OLEDs) due to their high intensity and monochromatic emission. The
tetrakis complexes usually present improved properties such as thermal and chemical
stabilities, besides higher luminescence lifetimes than its correspondent tris complexes.
Moreover, the commonly hydrated tris Ln3+-complexes show a luminescence
quenching due to vibronic coupling between H2O molecules and the Ln3+ principal
emitting levels (e.g., 4G5/2, 5D0, 5D4,
4F9/2 and 1G4 of the Sm3+, Eu3+, Tb3+, Dy3+ and Tm3+
ions, respectively) [1]. The acetylacetone (2,4-pentanedione) ligand, Hacac, is one of
the most extensively used and studied β-diketonate ligands, especially for the Tb3+ ion.
Nevertheless, the α-substituted Ln3+ β-diketonate complexes are relatively scarce in the
literature [2]. Hence, this work reports the synthesis, characterization, and
photoluminescent study of a new series of tetrakis coordination compounds containing
the α-substituted β-diketonates 3-chloro acetylacetone (Cl-acac), presenting the general
formula Na[Ln(Cl-acac)4], where Ln: Sm3+, Eu3+, Tb3+, Dy3+, and Tm3+.
All complexes were characterized by elemental analysis,
complexometric titration, thermal analysis, infrared
absorption spectroscopy (FTIR), and X-ray powder
diffraction (XPD). The Ln3+ complex photoluminescent
properties (Figure 1) as well as the experimental intensity
parameters (Ω2,4) of the Eu3+ were determined.
Como referenciar
ASSUNCAO, I.P.; BRITO, H.F.; FELINTO, M.C.F.C.; TEOTONIO, E.E.S.; MALTA, O.L. A new series of luminescent tetrakis Ln3+-complexes with α-substituted β-diketonate ligands and Na+ as countercation. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/32671. Acesso em: 20 Mar 2026.
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