Add time:08/17/2019         Source:sciencedirect.com

The equilibria of the complexation processes of V3+ with l-alanine and l-aspartic acid in aqueous solution over a wide pH range (2–10) were studied by potentiometric and spectroscopic (UV–Vis, CD) methods. The results show that alanine forms complexes with V3+ in the metal ion concentration range and at the ligand-to-metal ratios investigated, giving mononuclear species only. In ML2 species, which dominate in the range pH 4–8, alanine acts as a bidendate ligand through O and N atoms. The complexation processes of V3+ with aspartic acid are more complicated. In acidic solution (up to pH ∼4) they are similar to those for alanine. In the higher pH region, however, there are complicated equilibria among mono- and various dinuclear species. These dinuclear species consist of carboxylic or μ-oxo bridges and differ from each other by the number of coordinated ligands and OH− groups. The solid phase of the V(III) complex with aspartic acid could be isolated from nonaqueous solution only. Spectroscopic (UV–Vis–IR) measurements and magnetic susceptibility data confirm the coordination of vanadium(III) by two carboxylic groups. Both V(III)–l-aspartic acid and V(III)–l-alanine complexes have a significant apoptotic effect on Hepatoma Morris 5123 cells.

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