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(NO)(L) [L=N-cyclohexyl-2-pyrrolidone (NCP), N-Neopentyl-2-pyrrolidone (NNpP)] have been prepared by mixing PuO(NO) 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(NO)(L), which shows common structural features, i.e., the plutonyl ion is surrounded by four oxygen atoms from two NO 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 , 2.490-2.507 , 2.377-2.390 , respectively.