Luminescence Investigations on Eu(III) Thenoyltrifluoroacetonate Complexes with Amide Ligands

A new β-diketone complex with high color purity

“…All other ligand vibration frequencies are listed in Table 1. A displacement of 50 cm −1 of the C O band occurs for [Eu(tta) 3 (H 2 O) 2 ] complex, and reported by Teotônio et al [15]. In this work, a displacement of 106 cm −1 of C O band suggests a stronger interaction between oxygen atoms and europium ion.…”

Luminescence enhancement of the Tb(III) ion with the thenoyltrifluoroacetonate ligand acting as an efficient sensitizer

“…For this situation, there is a competitive balance between the non-radiative donation and the retrodonation (T ↔ 2S + 1 L J ), which makes the Ln(III) ions exhibit low luminescence intensities; iii) The donor ligand T state is considerably more energetic than the main acceptor excited 2S + 1 L J state of the Ln(III) ion, minimizing the retrodonation (T ← 2S + 1 L J ) processes; and iv) The ligand T states have energies largely above the main acceptor excited states of the central metal ion. Some works have determined that the energy gap between the lowest singlet and triplet excited states of the ligand around 5000 cm − 1 and the triplet state at least 3500 cm − 1 more energetic than the acceptor 2S + 1 L J level, is one of the better energetic conditions to obtain the coordination compounds with higher luminescence intensities centered on the Ln(III) ions [9][10][11][12][13][14][15].…”

New phosphinate ligand synthesis and its effect on optical properties of the europium β‐diketonate complex

“…A correlation has been noticed in the sense that compounds expected to have a higher degree of covalence tend to present higher values of Ω 2 [9][10][11] this result can be related with the bulk effects at longer distance experienced by the rare earth ion. The spectroscopy features and structure for the complex suggest its potential use for obtaining organized films of europium complex.…”