Specific sequestering agents for actinides. 11. Complexation of plutonium and americium by catecholate ligands
The results of the first in vitro experiments regarding the complexation of plutonium and americium by catechol and tetracatechoylamide ligands are presented. Electrochemical techniques have allowed the elucidation of the protonation behavior of Pu(IV)-and Pu(III)-catecholate complexes. Above pH 12, the Pu(IV) complex is a tetrakis(catecholate) complex and the Pu(III) complex is a tetrakis- or tris(catecholate) complex, depending upon ligand concentration. At neutral pH, the Pu(IV) complex of the octadentate ligand 3,4,3-LICAMS appears to be a tris(catecholate) complex, indicating that the full denticity of the ligand is not utilized in vivo. Spectroscopic evidence is presented for the complexation of Am(III) by tetracatechoylamide ligands. The inability to observe the Am(IV)/Am(III)-catecholate reduction couple indicates that the free-ion Am(IV)/Am(III) reduction potential is greater than +2.6 V vs. NHE. 48 references, 9 figures, 2 tables.
- Research Organization:
- Lawrence Berkeley Lab., CA
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5490028
- Journal Information:
- Inorg. Chem.; (United States), Vol. 24:4
- Country of Publication:
- United States
- Language:
- English
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