Electronic properties and metal-ligand bonding situation in Eu(III) complexes containing tris(pyrazolyl)borate and phenantroline ligands
| Autor: | Tapas Kar, Renato L. T. Parreira, David E. P. Fonseca, Giovanni F. Caramori, Pedro A. S. Bergamo, Eduardo J. Nassar, Eder H. da Silva, Daniel F. Coimbra, Lucas A. Rocha, Camila M.A. Ferreira |
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| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Photoluminescence Chemistry Infrared Ligand Inorganic chemistry Biophysics Infrared spectroscopy 02 engineering and technology General Chemistry Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics 0104 chemical sciences Metal Crystallography visual_art visual_art.visual_art_medium 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of Luminescence. 182:137-145 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.10.023 |
| Popis: | In this paper we report the preparation, characterization (infrared absorption spectroscopy, photoluminescence, and thermogravimetric analysis), and DFT based electronic structure calculations (GKS-EDA), used to shed light into the metal-ligand bonding situation, of a set of Eu 3+ complexes containing tris-(pyrazolyl)borate “scorpionate” (Tp) and phenantroline (phen) as ligands in different proportions. The Infrared results point out that the complexes [Eu(phen)(Tp) 3 ] (Eu/phen/Tp molar ratio 1:1:3) is not obtained, suggesting that Tp ligand displaces phen ligand leading to the formation of [Eu(Tp) 3 ] (molar ratio 1:3). Photoluminescence results, including emission and excitation spectra give support to the vibrational spectra interpretation, confirming that three ligands Tp displace the ligand phen, to form [Eu(Tp) 3 ]. GKS-EDA results show that Eu 3+ ---Tp interactions are much more stabilizing than Eu 3+ ---phen interactions, in agreement with the experimental evidences that the third Tp remove phen from the Eu 3+ coordination environment. |
| Databáze: | OpenAIRE |
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