Abstract
The complexation of molybdenum(VI) by L-aspartate in dilute aqueous solutions, at pH 6, was studied using u.v. spectrophotometry,1H and13C n.m.r. spectroscopy. A single complex anion, [MoO3(C4H5NO4)]2−, is observed in solution. The conformation of the aspartate ion in the complex was determined and shown to be consistent with it acting as a terdentate ligand. The formation constant of the complex was determined at different ionic strengths. Job's method has been employed, here and elsewhere, to study the stoichiometry of the complex. However, the result is strongly affected by polymerization of molybdenum(VI): this effect is discussed.
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