| Autor: |
Manzur, Jorge, Fuentealba, Pablo, Gil, Yolimar, Pérez-Obando, Juliana, Morales Alfaro, Jeannette, Vega Carvallo, Andrés Igor, Aravena, Daniel, Santana, Ricardo Costa de, Carneiro Neto, Albano N., Spodine, Evgenia |
| Zdroj: |
Inorganic Chemistry; November 2023, Vol. 62 Issue: 47 p19195-19207, 13p |
| Abstrakt: |
This work reports the structural characterization and photophysical properties of DyIII, TbIII, and EuIIIcoordination polymers with two phenoxo-triazole-based ligands [2,6-di(1H-1,2,4-triazole-1-yl-methyl)-4-R-phenoxo, LRTr (R = CH3; Cl)]. These ligands permitted us to obtain isostructural polymers, described as a 1D double chain, with LnIIIbeing nona-coordinated. The energies of the ligand triplet (T1) states were estimated using low-temperature time-resolved emission spectra of YIIIanalogues. Compounds with LClTr present higher emission intensity than those with LMeTr. The emission of TbIIIcompounds was not affected by the different excitation wavelengths used and was emitted in the pure green region. In contrast, DyLMeTremits in the blue-to-white region, while the luminescence of DyLClTrremains in the white region for all excitation wavelengths. On the other hand, EuIIIcompounds emit in the blue (ligand) or red region (EuIII) depending on the substituent of the phenoxo moiety and excitation wavelength. Theoretical calculations were employed to determine the excited states of the ligands by using time-dependent density functional theory. These calculations aided in modeling the intramolecular energy transfer and rationalizing the optical properties and demonstrated that the sensitization of the LnIIIions is driven via S1→ LnIII, a process that is less common as compared to T1→ LnIII. |
| Databáze: |
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