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  • Author or Editor: E. Fedoseev x
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Abstract  

Trace amounts of lanthanum hexafluoroacetylacetonate and indium acetylacetonate were isolated by combination of methods, which includes synthesis of volatile elements -diketonates by nucleophilic ligands exchange and fractional sublimation. This method is useful for produce isotope generators.

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Abstract  

Separation of239Np from243Am including extraction of Np/IV/ and Am/III/ by thenoyltrifluoroacetone solution in benzene, transformation of thenoyltrifluoroacetonates into volatile hexafluoroacetylacetones in the flow of a carrier gas saturated with hexafluoroacetylacetone vapours are described.

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Abstract  

The temperature dependence of the vapour pressure of californium-249 hexafluoroacetylacetonate adducts with tributylphosphate /TBP/, tributylphosphineoxide /TBPO/ and dipropylsulphoxide /DPSO/ is determined. The enthalpy and entropy sublimation of the compounds are calculated.

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Abstract  

Volatile einsteinium hexafluoroacetylacetonate complexes have been syntehsized. Their sublimation and thermochromatographic behaviour has been studied in the presence of -diketone vapours. Interaction of einsteinium di-and trichloride with hexafluoracetylacetone vapours is discussed.

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Abstract  

A possibility to use exchange reaction of metal \-diketonates and the vapours of \-diketones for the separation of volatile \-diketonate complexes by the method of fractional sublimation has been studied. When a mixture of thenoyltrifluoroacetonates of95Zr–95Nb and Th–233Pa is treated with a carrier gas containing hexafluoroacetylacetone vapours, zirconium and thorium, unlike niobium and protactinium, form volatile hexafluoroacetyl-acetonates which sublimate quite completely at 115°C. Niobium and protactinium remain in the initial sample in the form of nonvolatile compounds.

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Abstract  

The heterogeneous ligand exchange synthesis of volatile -diketonates of some actinides /230Th,233U,239Pu,241Am/ and fission product elements /90Sr,90Y,113Sn,113mIn/ and their separation by means of thermochromatography and fractional sublimation are reported. The methods are efficient for the separation of elements of different oxidation states.

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Abstract  

Volatile hexafluoroacetylacetonates of mendelevium and daughter fermium were first obtained by the interaction of hexafluoroacetylacetone with256Md radionuclide formed in the cyclotron under on-line conditions as well as by the heterophase exchange of ligands. Thermochromatographic behaviour of the complexes synthesized was studied in a flow of a carrier-gas saturated with ligand vapours.

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Abstract  

Volatile hexafluoroacetylacetonates of hafnium, ytterbium, scandium, as well as scandium trifluoroacetylacetonate and acetylacetonate have been obtained by interaction of -diketone vapours with radionuclides formed in a cyclotron in on-line operation. The application of volatile -diketonates for transport and separation of the short-life isotopes of metallic elements has been shown.

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