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V. A. Babain, M. Yu. Alyapyshev, M. D. Karavan, Volker Böhmer, L. Wang, E. A. Shokova, A. E. Motornaya, I. M. Vatsouro, V. V. Kovalev

Extraction of americium and europium by CMPO-substituted adamantylcalixarenes

Eight p-adamantylcalix[4]arene derivatives, bearing four CMPO-like functions [(CH₂)_nNHC(O)CH₂- P(O)Ph₂] at the wide (4a,b, n=0,1) or narrow (5a–c and 6a–c, n=2–4) rims were synthesized for the first time. Studies of the extraction of americium(III) and europium(III) from 3 M HNO₃ solutions to organic phases (dichloromethane, m-nitro-trifluoromethylbenzene) showed: (i) The extraction ability for all the adamantylcalixarene ligands is much better than for their monomeric analogues –N-(1-adamantyl)-, N-(1-adamantylmethyl)- and N,N-(dibutyl)carbamoylmethyldiphenylphosphine oxides 7a, 7b, 8; (ii) The extraction percentage increases strongly with increasing length of the spacer for all types of ligands 4–6, and best extraction results were found for 4b (n=1) and 5c (n=4); (iii) The separation coefficient D_Am/D_Eu for the investigated compounds did not exceed 2, which is close to the narrow rim CMPO calixarenes, studied earlier; (iv) Variation of the spacer length between CMPO groups attached to the 1,3- and 2,4-positions of the calixarene platform in 6 did not lead to appreciably improved extractants, neither with respect to the extraction abilities (D) nor to the selectivities (D_AmD_Eu).

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 93, 12/2005
Pages: 749 - 756

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