Energy transfer in ternary TbEDTA chelates with a series of dipicolinic acid derivatives
| Autor: | Harri Takalo, Jouko Kankare, Jaana Rosenberg, Jukka Lukkari, Keijo Haapakka, Markus Räsänen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Lanthanide
Quenching (fluorescence) Chemistry Biophysics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Dipicolinic acid 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences Ion chemistry.chemical_compound Physical chemistry Chelation 0210 nano-technology Spectroscopy Luminescence Ternary operation |
| Zdroj: | Journal of Luminescence. 220:116967 |
| ISSN: | 0022-2313 |
| Popis: | The energy transfer in lanthanoid chelates was studied using the ternary TbEDTA (EDTA = ethylenediaminetetraacetic acid) chelates with several dipicolinic acid derivatives (pyridine-2,6-dicarboxylic acid (L1, dpa), 4-(9H-fluoren-3-yl)pyridine-2,6-dicarboxylic acid (L2), 4-(dibenzo [b,d]furan-2-yl)pyridine-2,6-dicarboxylic acid (L3), 4-(dibenzo [b,d]thiophen-2-yl)pyridine-2,6-dicarboxylic acid (L4) and 4-(9H-carbazol-3-yl)pyridine-2,6-dicarboxylic acid (L5)) and spectroscopic methods (absorption and luminescence spectroscopy and the effect of argon treatment and temperature on luminescence lifetime(s)). The results revealed that the ILCT (intra-ligand charge transfer) state is inefficient in exciting the Tb(III) ion and the emissive states of the ligands, as well as the triplet states, act as quenching states by receiving energy back transfer from the Tb(III) ion. The stability constants for these ternary complexes were also determined. |
| Databáze: | OpenAIRE |
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