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Title: Fluorescence and Ir studies on the hydration state of lanthanides(III) and curium(III) in the complexes extracted with purified Cyanex301, Cyanex302 and Cyanex272

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 cdot 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 wi th Cyanex301. The Ln(III) complex with Cyanex301 has one or two H2O molecules with a molecular formula of LnL3 cdot 2H2O or HLnL4 cdot H2O, where L stands for the anion of Cyanex301. However, the Cm(III) complex with Cyanex301 does not contain H2O with the molecular formulamore » 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.« less
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
837928
Report Number(s):
LBNL-54773
Journal ID: ISSN 0033-8230; RAACAP; R&D Project: 403006; TRN: US200507%%58
DOE Contract Number:
AC03-76SF00098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Radiochimica Acta; Journal Volume: 92; Other Information: Journal Publication Date: 2004; PBD: 22 Mar 2004
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Director. Office of Science. Office of Basic Energy Sciences (US)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; ATOMS; FLUORESCENCE; FLUORESCENCE SPECTROSCOPY; HYDRATION; RARE EARTHS; SPECTROSCOPY; SULFUR; WATER; CYANEX LN(III) CM(III) HYDRATION FLUORESCENCE IR