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Molecular and crystal structures of plutonyl(VI) nitrate complexes with N-alkylated 2-pyrrolidone derivatives; Cocrystallization potentiality of U$$^{VI}$$ and Pu$$^{VI}$$

Kim, S.-Y.; Takao, Koichiro*; Haga, Yoshinori ; Yamamoto, Etsuji ; Kawata, Yoshihisa; Morita, Yasuji ; Nishimura, Kenji*; Ikeda, Yasuhisa*

Plutonyl(VI) nitrate complexes with N-cyclohexyl-2-pyrrolidone (NCP) and N-neopentyl-2-pyrrolidone (NNpP) were prepared, and their molecular and crystal structures were determined by single crystal X-ray analysis. The obtained compounds have the similar composition, PuO$$_{2}$$(NO$$_{3}$$)$$_{2}$$(NRP)$$_{2}$$ (NRP = NCP, NNpP), which are analogous to the corresponding U(VI) complexes. Both PuO$$_{2}$$(NO$$_{3}$$)$$_{2}$$(NRP)$$_{2}$$ complexes show typical structural properties of actinyl(VI) nitrates, i.e., hexagonal-bipyramidal geometry consisting of two NRP molecules and two NO$$_{3}$$$$^{-}$$ ions located in trans positions in the equatorial plane of PuO$$_{2}$$$$^{2+}$$ moiety. These findings provide one of criteria in selection of suitable NRP as a precipitation agent for the spent nuclear fuel reprocessing based on the precipitation method.



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Category:Chemistry, Multidisciplinary



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