Anionic alkyl diglycoldiamides with covalently bonded cobalt bis(dicarbollide)(1-) ions for lanthanide and actinide extractions

作者：Gruner B^*; Kvicalova M; Selucky P; Lucanikova M

来源：Journal of Organometallic Chemistry, 2010, 695(9): 1261-1264.

DOI：10.1016/j.jorganchem.2010.02.014

• Carboranes
• Metallaboranes
• Dicarbollides
• TODGA
• Liquid-liquid extraction
• Lanthanide-actinide extraction

Ionic diamides composed of a N,N'-dialkyl diglycolyl complexing group and two cobalt bis(dicarbollide)(1-) anions were synthesized with the aim to develop efficient extraction agents for liquid-liquid extraction of polyvalent cations, i.e. lanthanides and actinides from high-level activity nuclear waste. Compounds of general formulation [{(N,N-(8-CH(2)-CH(2)O)(2)-1,2-C(2)B(9)H(10))(1',2'-C(2)B(9)H(11))-3,3'-Co)(N',N'-R)NCOCH(2)}(2)O]Na(2), where R = n-C(4)H(9), n-C(8)H(17), n-C(12)H(25) and 1-C(6)H(4)-4-CH(3) (1-4), were prepared and characterized by combination of (11)B (1)H, (13)C NMR spectroscopy, ESI-MS, HPLC and other techniques. Effects of different nitrogen substitution in the structures of 1- 4 on the extraction properties were tested. The study resulted in the observation that the compounds are significantly (2-3 orders in magnitude) more efficient extractants for Eu(III) and Am(III) than synergic mixtures of organic N, N'-tetra n-octyl diglycolic acid diamide (TODGA) and chlorinated cobalt bis(dicarbollide) at the same concentrations of both groups. Low polar mixtures of n-dodecane (D) and hexyl methyl ketone (HMK) can be applied as an auxiliary solvent for extraction, replacing thus the polar and less environmentally friendly nitro-, fluoro- and chloro-solvents used in the current dicarbollide liquid-liquid extraction process.

• 出版日期2010-5-1