Abstract
Complexation constants have been determined by potentiometric titration and spectrophotometric measurements for several biologically relevant divalent metals (Ca 2+, Cu 2+, Zn 2+) as well as Al 3+ with the sulfonated tris(8-hydroxyquinolinate) tripodal ligand O-TRENSOX. The values demonstrate great selectivity of O-TRENSOX for Fe 3+ according to the sequence Fe 3+ >>Cu 2+>Zn 2+>Ca 2+. This selectivity is compared to that shown by tris(hydroxamate) and tris(catecholate) ligands. 1H NMR spectroscopy of the diamagnetic complexes have been carried out in 2H 2O solutions.
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