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Raman spectroscopic study on NpO$$_{2}$$$$^{+}$$-Ca$$^{2+}$$ interaction in highly concentrated calcium chloride

Fujii, Toshiyuki*; Uehara, Akihiro*; Kitatsuji, Yoshihiro; Yamana, Hajimu*

Coordination circumstance of neptunyl ion in concentrated CaCl$$_{2}$$ solutions was analyzed by Raman spectrometry. Besides the symmetric stretch ($$nu$$$$_{1}$$) mode of NpO$$_{2}$$$$^{+}$$ and NpO$$_{2}$$$$^{2+}$$, the asymmetric stretch ($$nu$$$$_{3}$$) mode of NpO$$_{2}$$$$^{+}$$ was found. The Raman intensity of the $$nu$$$$_{3}$$ mode increased with the concentration of CaCl$$_{2}$$ in the system. This would be attributable to the cation-cation interaction between Np(V) and Ca(II).



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Category:Chemistry, Analytical



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