Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2012, Issue 8, Pages 1509-1519Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201101576
Keywords
Actinides; Lanthanides; Nuclear waste; Extraction; N ligands
Categories
Funding
- European Union under the ACSEPT [FP7-CP-2007-211 267]
- Czech Ministry of Education, Youth and Sports [MSM 6840770020]
Ask authors/readers for more resources
Four new 6,6'-bis(1,2,4-triazin-3-yl)-2,2'-bipyridine (BTBP) ligands, which contain either additional alkyl groups on the pyridine rings or seven-membered aliphatic rings attached to the triazine rings, have been synthesized, and the effects of the additional alkyl substitution in the 4- and 4'-positions of the pyridine rings on their extraction properties with LnIII and AnIII cations in simulated nuclear waste solutions have been studied. The speciation of ligand 13 with some trivalent lanthanide nitrates was elucidated by 1H NMR spectroscopic titrations and ESI-MS. Although 13 formed both 1:1 and 1:2 complexes with LaIII and YIII, only 1:2 complexes were observed with EuIII and CeIII. Quite unexpectedly, both alkyl-substituted ligands 12 and 13 showed lower solubilities in certain diluents than the unsubstituted ligand CyMe4-BTBP. Compared to CyMe4-BTBP, alkyl-substitution was found to decrease the rates of metal-ion extraction of the ligands in both 1-octanol and cyclohexanone. A highly efficient (DAm > 10) and selective (SFAm/Eu > 90) extraction was observed for 12 and 13 in cyclohexanone and for 13 in 1-octanol in the presence of a phase-transfer agent. The implications of these results for the design of improved extractants for radioactive waste treatment are discussed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available