Effect of the [2-(diphenylphosphorylmethoxy)phenyl]diphenylphosphine oxide derivative structures on the extraction and i
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Russian Chemical Bulletin, International Edition, Vol. 69, No. 7, pp. 1336—1343, July, 2020
Effect of the [2-(diphenylphosphorylmethoxy)phenyl]diphenylphosphine oxide derivative structures on the extraction and ion-selective properties toward rare-earth elements I. S. Ivanova,a A. B. Ilyukhin,a E. N. Pyatova,a S. V. Demin,b E. A. Zhogin,c G. S. Tsebrikova,b V. P. Solov´ev,b D. V. Baulin,b V. E. Baulin,d and A. Yu. Tsivadzeb aN.
S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119991 Moscow, Russian Federation. E-mail: [email protected] bA. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Building 4, 31 Leninsky prosp., 119991 Moscow, Russian Federation cMIREA — Russian Technological University, M. V. Lomonosov Institute of Fine Chemical Technologies, 78 prosp. Vernadskogo, 119454 Moscow, Russian Federation dInstitute of Physiologically Active Compounds, Russian Academy of Sciences, 1 Severnyi proezd, 142432 Chernogolovka, Moscow Region, Russian Federation The effect of structures of the derivatives of [2-(diphenylphosphorylmethoxy)phenyl]diphenylphosphine oxide (L1) on the complexation properties toward rare-earth elements (REE) was studied. A new structural analogue of L1, isopropyl 2-(diphenylphosphorylmethoxy)benzoate (L3), was synthesized. The extraction of REE by the carboxylated podand L3 in a 1,1,7-trihydrododecafluoroheptanol—water system with the HNO3 concentration varied in a range from 1 to 6 mol L –1 was studied. The stability constants of the neodymium(III) and erbium(III) nitrate complexes with L3 and 1-(methoxydiphenylphosphoryl)-2-diphenylphosphoryl-4-ethylbenzene (L2) and of lutetium(III) nitrate and chloride complexes with L2 in 1,1,7-trihydrododecafluorheptanol were determined. The properties of the membranes of the ion-selective electrodes based on L1, L2, and L3 toward REE cations were tested. The crystal structures of L3 and [NdL3(NO3)3(DMSO)2] were determined by X-ray diffraction analysis. Key words: rare-earth elements, phosphorylpodands, [2-(diphenylphosphorylmethoxy)phenyl]diphenylphosphine oxide derivatives, synthesis, complexation, stability constants of complexes, extraction, UV—Vis and IR spectroscopy, ion-selective electrodes, X-ray diffraction analysis.
Organic ligands capable of efficient and selective binding with rare-earth elements (REE) can be used both in technologies of extraction and sorption isolation1,2 and as components of radiopharmaceuticals.3—5 It is known that short-chain phosphorylpodands, derivatives of 2-(diphenylphosphorylmethoxy)phenylphosphine oxide (L1), are fairly efficient extracting agents for REE extraction from nitric acid solutions.6—10 The extraction of REE from nitric acid solutions with solutions of L1 in dichloroethane was studied.6,7 Under other equivalent conditions, REE of the yttrium group are extracted much more efficiently than REE of the cerium group, and the distribution coefficients in both groups increase smoothly with an increase in the ele
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