Abstract
Solvent extraction of micro amounts of europium and americium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of 3,3′-bis(diphenoxyphosphoryl)-1,1′-(heptane-1,7-diyl)diurea (L) was investigated. The equilibrium data were explained assuming that the species HL+, ML3+, and \( {\text{ML}}_{2}^{3 + } \) (M3+ = Eu3+, Am3+; L = 3,3′-bis(diphenoxyphosphoryl)-1,1′-(heptane-1,7-diyl)diurea) are extracted into the organic phase. The values of extraction and stability constants of the cationic complex species were determined in nitrobenzene saturated with water. It was found that the values of the stability constants of the corresponding complexes \( \text{EuL}_{n}^{{\text{3} + }} \) and \( \text{AmL}_{n}^{{\text{3} + }} \), where n = 1, 2 and L is 3,3′-bis(diphenoxyphosphoryl)-1,1′-(heptane-1,7-diyl)diurea, in water-saturated nitrobenzene are comparable. Finally, it was proven experimentally that in the nitrobenzene medium, the 3,3′-bis(diphenoxyphosphoryl)-1,1′-(heptane-1,7-diyl)diurea ligand is a very effective receptor for the Eu3+ and Am3+ cations.
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This work was supported by the Grant Agency of Faculty of Environmental Sciences, Czech University of Life Sciences, Prague, Project No.: 42900/1312/3114 entitled “Environmental Aspects of Sustainable Development of Society,” and by the Czech Ministry of Education, Youth, and Sports, Project MSMT No.: 20/2015.
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Makrlík, E., Vaňura, P. & Selucký, P. Solvent Extraction of Europium and Americium into Nitrobenzene by Using Hydrogen Dicarbollylcobaltate in the Presence of 3,3′-Bis(diphenoxyphosphoryl)-1,1′-(heptane-1,7-diyl)diurea. J Solution Chem 45, 1773–1784 (2016). https://doi.org/10.1007/s10953-016-0541-3
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DOI: https://doi.org/10.1007/s10953-016-0541-3