Russian Journal of General Chemistry. Vol. 92, No. 11, Pages 2290-2296, 2022

A. N. Turanov^a, V. K. Karandashev^b, V. E. Baulin^c, D. V. Baulin^d^,*, G. V. Kostikova^d, and A. M. Fedoseev^d

^aYu.A. Ossipyan Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, 142432 Russia

^bInstitute for Problems of Microelectronics Technology and High-Purity Materials of the Russian Academy of Sciences, Chernogolovka, 142432 Russia

^cInstitute of Physiologically Active Substances of the Russian Academy of Sciences, Chernogolovka, 142432 Russia

^dA.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Moscow, 119991 Russia

Abstract— The extraction of U(VI), Th(IV), Am(III), and lanthanide(III) ions and HNO₃ from nitric acid solutions with 1,2-dichloroethane solutions of 3-oxapentane-1,5-diylbis(diphenylphosphine)dioxide and its structural analogues was studied. The stoichiometry of the extractable complexes was determined. The effects of the extractant structure and HNO₃ concentration in the aqueous phase on the efficiency of the metal ions extraction into the organic phase were considered. The successive replacement of two methylene groups connecting the ether oxygen atom with Ph₂P(O) groups in the podand molecule by o-phenylene groups leads to an increase in the efficiency of Th(IV) Am(III), and Ln(III) extraction from nitric acid solutions, but has little effect on the efficiency of U(VI) extraction.

Keywords: phosphorylpodands, extraction, uranium(VI), thorium(IV), americium(III), lanthanides(III)

Effect of the Structure of Phosphoryl-Containing Podands on the Extraction of Actinides and Lanthanides(III) from Nitric Acid Solutions