Shedding light on Eu(III) β-diketonate compounds with 1,2-Bis(diphenylphosphino)ethane oxide ligand
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European Journal of Inorganic Chemistry
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A series of novel lanthanide beta-diketonate coordination compounds containing the ancillary ligand bis(diphenylphosphino) oxide (dppeO(2)) have been synthesized, characterized, and studied spectroscopically. The compounds of formulas Ln(beta-dik)(3)(dppeO(2)), where Ln: Eu and Gd and beta-dik ligands as tta (Ln-1), btf (Ln-2), bzac (Ln-5) and tfac (Ln-4), and Ln(2)(beta-dik)(6)(dppeO(2)) with ligand dbm (Ln-3) and fod (Ln-6). Their photophysical properties were investigated from the Judd-Ofelt intensity parameters (Omega(lambda)), radiative (A(rad)) and non-radiative (A(nrad)) rates, intrinsic (Q(Eu)(Eu)) and overall (Q(Eu)(L)) quantum yields, and CIE (x,y) color coordinates. The Eu-5 and Eu-6 compounds have the first excited triplet states T-1 (around 18802 and 18976 cm(-1), respectively) almost resonant with the Eu3+ 5D0 emission level, whereas the complexes Eu-1, Eu-2, Eu-3, and Eu-4 exhibited higher T-1 energies. The A(rad) values were predominantly driven by the intensity parameter , suggesting more pronounced angular changes in the first coordination sphere of the Eu3+ ion. The A(nrad) values also exhibited significant changes with the beta-diketonate ligands. Eu-1 showed the highest value of Q(Eu)(L)(60 %), indicating a more efficient intramolecular energy transfer process. On the other hand, Eu-5 and Eu-6 compounds showed Q(Eu)(L )values equal to 18.7 % and 16.5 %, respectively, which indicates the presence of luminescence quencher channels.
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SANTOS, PAULO R.S.; JESUS, ASHLEY A.S.S.; LIMA, WILLIAM B.; ARRUDA, JOALDO G.; FAUSTINO, WAGNER M.; FELINTO, MARIA C.F.C.; SABINO, JOSE R.; BRITO, HERMI F.; COSTA, ISRAEL F.; MOURA JUNIOR, RENALDO T.; CARNEIRO NETO, ALBANO N.; MALTA, OSCAR L.; TERRASCHKE, HUAYNA; TEOTONIO, ERCULES E.S. Shedding light on Eu(III) β-diketonate compounds with 1,2-Bis(diphenylphosphino)ethane oxide ligand: an optical study. European Journal of Inorganic Chemistry, v. 27, n. 4, p. 1-13, 2024. DOI: 10.1002/ejic.202300660. Disponível em: https://repositorio.ipen.br/handle/123456789/48022. Acesso em: 30 Dec 2025.
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