Near infrared spectroscopic properties of new beta-diketonates lanthanide complexes with different phosphine oxide ligands
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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The present work reports the synthesis, characterization and luminescent properties of
the Ln3+--diketonate complexes, Ln(-dik)2(NO3)L2, Ln()3L2 and Ln(DBM)3L, where
Ln3+ = Pr3+, Nd3+, Sm3+, Er3+ and Yb3+, -dik = thenoyltrifluoroacetone (TTA) and
dibenzoylmethane (DBM), L = triphenylphosphine oxide (TPPO), tributylphosphine oxide
(TBPO), and trioctylphosphine oxide (TOPO). The complexes were characterized by
complexometric titration with EDTA, CHN elemental analysis, IR spectroscopy (FT-IR) and
thermogravimetric analysis (TGA) [1]. Single-crystal X-ray diffraction analyses reveal that
Ln(DBM)2(NO3)(TOPO)2 complexes crystallize in the monoclinic space group P21/c with
parameters cell: a=36.727 Å; b=13.752 Å; c=15.836 Å; =90°; =93.09° e 90°.
Photoluminescent properties in the near infrared (NIR) region were investigated from
excitation and emission spectra. Excitation spectra are characterized by the presence of large
bands associated with transitions centered on organic ligands, indicating that these ligands act
as good sensitizers for Ln3+ ions that exhibit luminescence in the NIR region. The emission
spectra in the NIR region of the bis- and tris-diketonate complexes of Pr3+, Nd3+, Sm3+, Er3+
and Yb3+ ions present the set of intraconfiguration transitions, characteristic of each metal
center (Figure 1) [2]. Furthermore, it was observed that changes in the nature and number of
ligands coordinated to the Ln3+ ion slightly influence the spectral profiles. The results
obtained from the studied systems suggest that these are potential candidates to act as
Molecular Light Converting Devices.
Como referenciar
MOURA, J.L.; COSTA, I.F.; SANTOS, P.R.S.; TEOTONIO, E.E.S.; FAUSTINO, W.M.; BRITO, H.F.; FELINTO, M.C.F.C.; BURROW, R.A. Near infrared spectroscopic properties of new beta-diketonates lanthanide complexes with different phosphine oxide ligands. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/28645. Acesso em: 20 Mar 2026.
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