[1B05-07] Behaviour of Actinide Elements

[1B05] Formation of Sparingly Soluble Actinide(IV)-Nitrato Complexes with Bis(2-pyrrolidone) Derivative having Adamantane Cross-Linking Moiety and Its Applicability to Precipitation-Based Reprocessing

*Ryoma Ono¹, Takao Koichiro¹ (1. Tokyo Institute of Technology)

Keywords:Tetravalent Actinide, Spent Fuel Reprocessing, Precipitation Method, Bis(2-pyrrolidone) Derivatives

We found that a reaction between a bis(2-pyrrolidone) derivative having adamantane cross-linking moiety (L) and tetravalent actinide (An(IV)) in HNO₃(aq) results in a sparingly soluble salt, (HL)₂[An(NO₃)₆]. In its crystal structure, L forms a hydrogen-bonded dimeric dication with 2 H⁺, (HL)₂²⁺, as an isolated counter cation for [An(NO₃)₆]²⁻. This point is critically different from those of other bis(2-pyrrolidone) derivatives reported previously, where hydrogen bond polymers are formed instead.