A. N. Frumkin Institute of Physical chemistry and Electrochemistryof Ural Department of Russian Academy of Sciences

A. M. Safiulina, Senior Researcher, e-mail: alfiya_safiulina@mail.ru

A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS)

A. G. Matveeva, Senior Researcher

D. Mendeleev University of Chemical Technology of Russia

T. K. Dvoryanchikova, Post-Graduate Student f a Chair of Rare Elements and based on them Nanomaterials

O. A. Sinegribova, Professor of a Chair of Rare Elements and based on them Nanomaterials

A. E. Arbuzov Institute of Organic and Physical Chemistry Kazan Scientific Center Russian Academy of Sciences

D. A. Tatarinov, Researcher

In present paper the extraction ability of a number of acetylcontaining phosphine oxides R₂P(O)CMe₂CH₂C(O) Me relative to lanthanum (III), neodymium (III), holmium (III) and ytterbium (III) in nitric acid was studied. Comparison of extraction properties of acetylcontaining phosphine oxides and carbamoylphosphine oxides — Ph₂P(O)CH₂C(O)NBu₂ shows that acetylcontaining phosphineoxides extract trivalent lanthanides from 2 mole/l nitric acid much more efficiently than reference ligand — diphenyldibutylmethylcarbamoylphosphine oxide. The highest selectivity for separation of pairs heavy-light lanthanide exhibit acetylcontaining phosphine oxides with longest carbon radicals at phosphorus atom. Replacement of alkyl substituents at phosphorus atom on phenyl one virtually does not change the efficiency and selectivity of the extraction, in contrast to the sharp increase in the efficiency at such a replacement in the case of reagents forming chelate complexes with extracted metals. As a consequence it can be assumed that the investigated acetylcontaining phosphine oxides at extraction of lanthanides from 2 mole/l nitric acid act as monodenthate extractants. However, unlike the well known monodenthate phosphoryl containing substances that successfully extract trivalent lanthanides only at high concentrations of nitric acid — 5 mole/l and above, the acetylcontaining phosphine oxides effectively extract lanthanides already from 2 mole/l nitric acid. Increasing the length of the alkyl radical at phosphorus atom (increase of the ligand lipophilicity) increases the selectivity of the extractant for pairs heavy-light lanthanides.

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