Electrospray Ionization Mass Spectrometry Investigation of BTBP - Lanthanide(III) and Actinide(III) Complexes

摘要

In the framework of nuclear waste reprocessing, the separation processes of minr actm.des from fission products are developed using liquid-liquid extraction. To gam an understanding of the mechanism involved in the extraction process, a complex formaton of actm.des and lanthanides with BTBPs (6,6'-bis(5,6- IonizationMass Spectrometry (ESI-MS) technique. This study was carried out to two extractants,C5-BTBP and CyMe4-BTBP,were selected fro this experiment, It was found that the change of the d.luent and of the substituent on the BTBP moiety does not modify the stoichiometry of the complexed which is L2M(NO3), It is proposed that one nitrate is directly coordinated to the metalion, the two other anions probably remaining in the outer coordination sphere. The difference observed in extracting properties is probably due to the solvation of the complexes by the diluent. The noncovalent force that holds complexes together are likely be largely governed by electrostatic interactions even if the hydrophobic exterior of the complexes plays an important role in the complexation/extraction mechanism. The study of the stability of the ions in the gas phase shows that the C5-BTBP ligand has a labile hydrogen atom, which is a fragility point of C5-BTBP.