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Abstract
An extraction chromatography resin containing the anionic ligand (η5‐pentamethylcyclopentadienyl)tris‐(diethylphosphito‐P)cobalt(III), Cp * Co[P(O)(OEt)2]3 − (1Et) has been prepared. The resin consists of 1 wt% 1Et on Amberlite® XAD‐7. This resin strongly sorbs Am3+ and Pu4+. The sorption of these ions decreases with increasing nitric acid concentration, but this effect is more pronounced for Am3+. This allows for convenient separation of Am3+ from Pu4+ by simple adjustments in the HNO3 concentration. The tripodal geometry of 1Et disfavors the complexation of UO2 2+, so sorption of U(VI) by the 1Et‐containing resin is weak. An analogous resin containing Cp * Co[P(O)(OPr)2]3 − (1Pr) shows similar Pu4+ sorption behavior.
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Acknowledgments
Pacific Northwest National Laboratory is operated for the US Department of Energy by Battelle under Contract DE‐AC06‐76RL01830. This work was funded by the US Department of Energy through the Laboratory Directed Research and Development funds. The authors thank W. C. Cosby and B. M. Rapko for their review of this manuscript and S. Friese for assisting in preparing the 1Et ligand.