| Autor: |
Drew, Michael G. B., Hill, Clement, Hudson, Michael J., Iveson, Peter B., Madic, Charles, Vaillant, Ludovic, Youngs, Tristan G. A. |
| Zdroj: |
New Journal of Chemistry; 2004, Vol. 28 Issue: 4 p462-470, 9p |
| Abstrakt: |
The ability of new hydrophobic tridentate ligands based on 2,6-bisbenzimidazol-2-ylpyridine, 2,6-bisbenzoxazol-2-ylpyridine and 2,6-bisbenzothiazol-2-ylpyridine to selectively extract americiumiii from europiumiii was measured. The most promising ligand – 2,6-bisbenzoxazol-2-yl-4-2-decyl-1-tetradecyloxypyridine L9was found to give separation factors SFAmEu of up to 70 when used to extract cations from 0.02–0.10 M HNO3into TPH in synergy with 2-bromodecanoic acid. Six structures of lanthanide complexes with 2,6-bisbenzoxazol-2-ylpyridine L6were then determined to evaluate the types of species that are likely to be involved in the separation process. Three structural types were observed, namely LnL6NO33H2O2, 11-coordinate only for La, LnL6NO33CH3CN, 10-coordinate for Pr, Nd and Eu and LnL6NO33H2O, L 10-coordinate for Eu and Gd. Quantum Mechanics calculations were carried out on the tridentate ligands to elucidate the conformational preferences of the ligands in the free state and protonated and diprotonated forms and to assess the electronic properties of the ligands for comparison with other terdentate ligands used in lanthanideactinide separation processes. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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