Abstract
Coordination circumstance of neptunyl ion in concentrated CaCl2 solutions was analyzed by Raman spectrometry. Besides the symmetric stretch (ν1) mode of NpO2 + and NpO2 2+, the asymmetric stretch (ν3) mode of NpO2 + was found. The Raman intensity of the ν3 mode increased with the concentration of CaCl2 in the system. This would be attributable to the cation–cation interaction between Np(V) and Ca(II).
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