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

I. G. Tananaev, Chief Researcher

A. Yu. Tsivadze, Director

V. E. Baulin, Chief Researcher; Head of Laboratory, Institute of Physiologically Active Substances of Ural Department of Russian Academy of Sciences

D. Mendeleev University of Chemical Technology of Russia

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

In present work a study on the extraction ability of neutral and acidic tetrasubstituted (o-phenylenoxymethylene) diphosphines relative to uranium(VI), thorium(IV) and neodymium(III) in nitric acid media when replacing aryl radicals at phosphoryl group was investigated. When replacing one hydroxyl group on alkoxyl ethyl(2-[(diphenylphosphoryl) methoxy]phenyl)phosphonate a sharp rise in distribution coefficients of uranium(VI) has been discovered already at low concentrations of nitric acid in aqueous phase versus (2-[(diphenylphosphoryl)methoxy]phenyl) phosphonic acid. When replacing one hydroxyl group at ethoxy group high distribution coefficients of thorium(IV) have been obtained, whereas in the case of diethyl (2-[(diphenylphosphoryl)methoxy]phenyl)ethoxyphosphonate with two ethoxy-groups, the extraction ability decreases. At extraction of neodymium(III) by solutions of ethyl(2-[(diphenylphosphoryl)methoxy]phenyl)phosphonate or diethyl(2-[(diphenylphosphoryl)methoxy]phenyl) phosphonate in chloroform distribution coefficients increases with an increase of the nitric acid concentration. Extraction of neodymium(III) is the result of interaction with phosphoryl groups only. The impact nature of substitutes at phosphorus atom on extraction ability of tetrasubstituted (o-phenylenoxymethylene)diphosphines relative to uranium(VI), thorium(IV) and neodymium(III) has been identified. (2-[(Diphenylphosphoryl)methoxy] phenyl) phosphonic acid is the best extractant for thorium(IV) and neodymium (III) from nitric acid media in a wide range of nitric acid concentrations. Ethyl(2-[(diphenylphosphoryl) methoxy]phenyl)phosphonate is the best extractant for uranium(VI) in a wide range of nitric acid concentrations.

1. Rozen A. M., Nikolotova Z. I., Kartasheva N. A. Doklady AN SSSR – Reports of USSR Academy of Sciences. 1975. Vol. 222. No. 5. pp. 1151–1154.

2. Horwitz E. P., Diamond H., Kalina D. G. Carbamoylmethylphosphoryl Derivatives as Actinide Extractants. Their Significance in the Processing and Recovery of Plutonium and Other Actinides. Plutonium Chemistry, Chapter 27. 1983. ACS Symposium Series. 216. pp. 433–450.

3. Anyun Zhang, Qihui Hu, Weihong Wang and Etsushu Kuraoka. Industrial and Engineering Chemistry Research. 2008. Vol. 47(16). pp. 6158–6165.

4. Turanov A. N., Karandashev V. K., Baulin V. E., Yarkevich A. N., Safronova Z. V. Solvent Extraction and Ion Exchange. 2009. Vol. 27(4). pp. 551–578.

5. Turanov A. N., Baulin V. E., Kharitonov A. V., Tsvetkov E. N. Zhurnal neorganicheskoy khimii – Russian Journal of Inorganic Chemistry. 1994. Vol. 39, No. 8. pp.1394–1399.

6. Baulin V. E., Syundyukova V. Kh., Tsvetkov E. N. Zhurnal Obshchey Khimii – Russian Journal of General Chemistry. 1989. Vol. 59. Is. 1. pp. 62–67.

7. Tkachenko S. E., Yarkevich A. N., Timofeev S. V., Tsvetkov E. N. Zhurnal Obshchey Khimii – Russian Journal of General Chemistry. 1988. Vol. 58. Is. 3. pp. 531–536.

8. Savin S. B. Arsenazo III (Arsenazo III). Moscow : Atomizdat, 1966. 256 p.

9. Rozen A. M., Krupnov B. V. Uspekhi Khimii – Russian Chemical Reviews. 1996. Vol. 65, No. 11. pp. 1052–1079.