Fluorescence and IR studies on the hydration state of lanthanides(III) and curium(III) in the complexes extracted with purified Cyanex301, Cyanex302 and Cyanex272
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Guoxin Tian
Summary
The hydration number of lanthanides, Ln(III) (Ln = Sm, Eu, Tb, Dy), and Cm(III) in the extracted complexes with purified Cyanex301, Cyanex302 and Cyanex272 was investigated using time-resolved laser-induced fluorescence spectroscopy (TRLFS) and FT-IR spectroscopy. The results, in conjunction with the previous results on the Ln(III) and Am(III) complexes, provide insight into the composition of the extracted complexes. No difference has been observed in the hydration number or the composition between the Ln(III) and Cm(III) complexes with Cyanex302 or Cyanex272. The extracted complexes of Ln(III) and Cm(III) with Cyanex302 have the formula, ML(HL2)2·nH2O, where L stands for the anion of Cyanex302 and n=3-5. No water molecules are found in the first coordination shell of Ln(III) or Cm(III) complexes with Cyanex272. In contrast to the extraction with Cyanex302 or Cyanex272, the composition of the Ln(III) complexes is different from that of the Cm(III) complex in the extraction with Cyanex301. The Ln(III) complex with Cyanex301 has one or two H2O molecules with a molecular formula of LnL3·2H2O or HLnL4·H2O, where L stands for the anion of Cyanex301. However, the Cm(III) complex with Cyanex301 does not contain H2O with the molecular formula of HCmL4, in which only the 8 sulfur atoms from Cyanex301 coordinate to Cm(III). The results for Cm(III) agree with the previous data for Am(III) from EXAFS and IR measurements.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Artikel in diesem Heft
- Experimental studies and nuclear model calculations on (p, xn) and (p, pxn) reactions on 85Rb from their thresholds up to 100 MeV
- Theoretical treatment of the complexation of element 106, Sg, in HF solutions
- Extraction and separation of Am(III) and Sr(II) by N,N,N´,N´-tetraoctyl-3-oxapentanediamide (TODGA)
- Method for determining plutonium in air filters in detection of nuclear activities
- Advanced aqueous reprocessing in P&T strategies: Process demonstrations on genuine fuels and targets
- Uranium association with halophilic and non-halophilic bacteria and archaea
- Complex formation of uranium(VI) in periodate solutions
- Fluorescence and IR studies on the hydration state of lanthanides(III) and curium(III) in the complexes extracted with purified Cyanex301, Cyanex302 and Cyanex272
- Synthesis and characterization of uranium(VI) and thorium(IV) complexes with o-hydroxy N,N´-dimethylbenzylamine and o-carboxy N,N´-dimethylbenzylamine
- Ion exchange and chromatographic separation of cesium, strontium and europium from acidic streams using uranium antimonate
- Investigations on adsorption and transport behaviour of carrier-free silver, gold and platinum in quartz columns under vacuum conditions
