Luminescence in Ln3+ dipivaloylmethanate complexes
Carregando...
Data
Data de publicação
Autores IPEN
MARIA CLAUDIA FRANCA DA CUNHA FELINTO
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Polyhedron
Exportar
Resumo
Three novel lanthanide dipivaloylmethanate (dpm) complexes of general formula [Ln(dpm)(NO3)2(tchpo)2],
where Ln: Eu3+, Gd3+ and Tb3+, and tchpo: tricyclohexylphosphine oxide neutral ligand have been prepared and
characterized by elemental analyses, absorption infrared spectroscopy, thermalgravimetric analyses, diffuse
reflectance, and luminescence spectroscopies. Furthermore, the [Tb(dpm)(NO3)2(tchpo)2] complex was structurally
characterized by the single crystal X-ray diffraction analysis. This complex exhibited high luminescence
intensity in the green region. On the other hand, the analogous Eu3+-complex exhibited very low luminescence
intensity due to an efficient luminescent quenching process via ligand-to-metal charge transfer (LMCT) state.
Theoretical studies employing Time-Dependent Density Functional Theory (TD-DFT) calculations along with
results obtained from the JOYSpectra platform, support this experimental result. Remarkably, despite the high
values of non-radiative intramolecular energy transfer from excited ligand states (S1 and T1) to the excited levels
of the Ln3+ ions, in the [Eu(dpm)(NO3)2(tchpo)2], the highest S1-LMCT rate (W = 1.2 × 1010 s 1) emphasizes
that the primary luminescence quenching pathway is via depopulation of excited ligand states. Interestingly, the
nitrogen atoms from nitrate ions play an essential role in the lanthanide chemical environment, which has been
suggested by the analyses of the ligand field parameters charge factors (g) and effective polarizabilities (αʹ)
values.
Como referenciar
ARRUDA, JOALDO G.; SILVA, IRAN F.; FAUSTINO, WAGNER M.; COSTA, ISRAEL F.; BRITO, HERMI F.; CARNEIRO NETO, ALBANO N.; NATHER, CHRISTIAN; TERRASCHKE, HUAYNA; FELINTO, MARIA C.F.C.; DEFLON, VICTOR M.; TEOTONIO, ERCULES E.S. Luminescence in Ln3+ dipivaloylmethanate complexes: spectroscopic and theoretical investigation on the energy transfer and LMCT state. Polyhedron, v. 267, p. 1-12, 2025. DOI: 10.1016/j.poly.2024.117313. Disponível em: https://repositorio.ipen.br/handle/123456789/49828. Acesso em: 29 Apr 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.