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Curium(III) species and the coordination states in concentrated LiCl-aqueous solutions studied by time-resolved laser-induced fluorescence spectroscopy

Journal of Alloys and Compounds
Publication Date
DOI: 10.1016/j.jallcom.2005.04.127
  • Cm(Iii)
  • Concentrated Licl-Aqueous Solution
  • Inner-Sphere Hydration Number
  • Average Chloride Coordination Number
  • Time-Resolved Laser-Induced Fluorescence Spectroscopy


Abstract Study on Cm(III) species and the coordination states in concentrated LiCl-aqueous solutions were performed by using time-resolved laser-induced fluorescence spectroscopy. The inner-sphere hydration number, N H 2 O and average chloride coordination number, N Cl, of Cm(III) were determined from the luminescence lifetimes and emission spectra, respectively. While the inner-sphere coordination sites of Cm(III) was fully occupied by water molecules in the C LiCl range less than 4 M, the inner-sphere chloro complexation of Cm(III) was observed in the C LiCl range more than 6 M. The total coordination number, defined as the sum of N H 2 O and N Cl, was kept constant in the C LiCl range up to 10 M, and then decreased gradually with an increase of C LiCl. This indicates that one chloride ion excludes more than one water molecule through the inner-sphere chloro complexation in the extremely concentrated LiCl-aqueous solutions.

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