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L. Rao, Gregory R. Choppin, Raymond Bergeron
Complexation of thorium(IV) with desmethyldesferrithiocin
The complexation of Th(IV) with desmethyldesferrithiocin (H2DMDFT), a derivative of the siderophore desferrithiocin (H2DFT), was studied by potentiometry, spectrophotometry and NMR. Three protonation constants of the ligand were determined by potentiometric titrations and 1H-NMR and assigned to the phenolate group, the nitrogen at the hydroxypyridine ring, and the carboxylate group. The formation constant of the 1:2 complex, Th(DMDFT)2, was determined by absorption spectrophotometry with oxalate as a competing ligand. A tridentate complex with Th(IV) involving the phenolate oxygen, the thiazoline nitrogen and the carboxylate group of H2DMDFT was proposed.
Radiochimica Acta, Oldenbourg Wissenschaftsverlag
Print ISSN: 0033-8230
Volume: 88, 12/2000
Pages: 851