Effect of bulky phosphine oxide ligands on the structural and photophysical properties of europium β-diketonate complexes

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Abstract

In this work, we investigate the structural and photophysical properties of europium complexes with the general formulas Eu(dbm)₃L and Eu(dbm)₂(NO₃)L₂ (dbm: dibenzoylmethanate; L : tchpo, tpAsO, or topo). Surprisingly, the tris-(β-diketonate) complexes displayed markedly lower emission intensities than their corresponding bis-(β-diketonate) analogues. The highest difference was observed for the [Eu(dbm)₃(topo)] and [Eu(dbm)₂(NO₃)(topo)₂] complexes. This unusual behaviour is attributed to the presence of low-lying excited states due to intermolecular interactions, which promote additional non-radiative deactivation pathways and, consequently, reduce the luminescence efficiency.

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Programme
16:00 to 16:25 on 09/15/2026
Room 2
Institutions
  • 1 Universidade Federal da Paraíba
  • 2 Federal University of Paraíba
  • 3 Nuclear Energy Research Institute
  • 4 Chemistry Institute - University of Sao Paulo
  • 5 IQ-USP
  • 6 Chemistry Institute of São Carlos (IQSC), University of São Paulo (USP)
  • 7 University of São Paulo
Track
  • Lecture
Keywords
Europium complexes
β-Diketonates
Photophysical properties
Structural properties
Energy transfer