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Report No.

Development of advanced reprocessing system using high selective and controllable precipitants, 11; Structural analyses of Pu(VI) nitrate complexes with pyrrolidone derivatives

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

The crystal structure of plutonyl(VI) nitrate complexes, PuO$$_{2}$$(NO$$_{3}$$)$$_{2}$$(L)$$_{2}$$ [L=N-cyclohexyl-2-pyrrolidone (NCP), N-Neopentyl-2-pyrrolidone (NNpP)] have been prepared by mixing PuO$$_{2}$$(NO$$_{3}$$)$$_{2}$$ and L in an aqueous nitric acid solution and its crystal structure was determined using X-ray diffractometry and confirmed by IR spectroscopy. The plutonyl(VI) nitrate complexes with L normally have a composition of PuO$$_{2}$$(NO$$_{3}$$)$$_{2}$$(L)$$_{2}$$, which shows common structural features, i.e., the plutonyl ion is surrounded by four oxygen atoms from two NO$$_{3}$$ $$^{-}$$ and two donating atoms of two L in its equatorial plane. X-ray diffraction study reveals that average distances between plutonium atom and plutonyl-, nitrate-, and carbonyl- oxygen atoms are 1.727-1.731 ${AA}$, 2.490-2.507 ${AA}$, 2.377-2.390 ${AA}$, respectively.



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