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Safiulina A.M.,OJSC Uralchem Joint Chemical Company | Matveeva A.G.,RAS Nesmeyanov Institute of Organoelement Compounds | Ivanets D.V.,Institute of Chemical Technology | Kudryavtsev E.M.,RAS Institute for Nuclear Research | And 2 more authors.
Russian Chemical Bulletin | Year: 2015

The properties of a number of phosphoryl-containing acidic podands different in terminal group structure were compared in the extraction of uranium(vi), thorium(iv), lanthanum(iii), neodymium(III), holmium(III), and ytterbium(III) from nitric acid solutions to 1,2-dichloroethane: 2-[(HO)(RO)(O)P]-4-R-C6H4-(OCH2CH2)2-OC6H4-4-R-2-[P(O)(RO)(OH)] (1-6), where R = Et, R = H (1), R = Bu, R = H (2), R = R = Et (3), R = Bu, R = Et (4), R = Et, R = But (5), and R = Bu, R = But (6). The synthesis of podands 2, 4, and 6 obtained for the first time was described. The most efficient extractants for selective recovery of ThIV and UVI in the presence of lanthanides are podands 4-6, which extract actinides quantitatively at low concentrations of nitric acid. Micellar aggregates 6-90, 7-70, and 9-20 nm in size were found by the dynamic light scattering method in extracts of uranium(vi), thorium(iv), and neodymium(iii), respectively, by podand 4. The composition and structure of extracted uranium complexes were determined for podand 2 by IR spectroscopy and elemental analysis. © 2015 Springer Science+Business Media New York.


Safiulina A.M.,OJSC Uralchem Joint Chemical Company | Matveeva A.G.,RAS Nesmeyanov Institute of Organoelement Compounds | Ivanets D.V.,Institute of Chemical Technology | Kudryavtsev E.M.,RAS Institute for Nuclear Research | And 3 more authors.
Russian Chemical Bulletin | Year: 2015

The extraction efficiency of uranium(vi), thorium(iv), and lanthanum(iii) from nitric acid solutions to 1,2-dichloroethane was compared for a series of phosphoryl podands of the acidic type different in polyether chain length and number of oxygen atoms: 2-[(HO)(EtO)(O)P]-C6H4-(OCH2CH2) m -OC6H4-2-[P(O)(EtO)(OH)] (1-3, where m = 1-3) and 2-[(HO)(EtO)(O)P]-C6H4-O(CH2)5O-C6H4-2-[P(O)(EtO)(OH)] (4). The synthesis of podands 1 and 4 obtained for the first time is described. The molecular and crystal structures of podand 1 were determined by X-ray diffraction analysis, and the formation of a strong intramolecular hydrogen bond was observed. Podand 2 is the most efficient extractant for the selective recovery of ThIV in the presence of UVI and LaIII among the studied podands. Micellar aggregates 3-5, 6-90, 3-70, and 7-10 nm in size were found by the dynamic light scattering data in thorium extracts of podands 1-4, respectively. © 2015 Springer Science+Business Media, Inc.

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