Stability constants of mixed ligand complexes of vanadium(III) with 8-hydroxyquinoline and the amino acids glycine, proline, α-alanine and β-alanine

Abstract

In this work we report the results of the investigation on the formation of ternary complexes in vanadium(III)–8-hydroxyquinoline (H8HQ) and amino acid glycine (HGly, HL), proline (HPro, HL), αalanine (HαAla, HL) and βalanine (HβAla, HL) systems. The analysis of the potentiometric data with the least-squares program LETAGROP indicates the formation of the complexes [V(8HQ)(HL)]2+ and V(8HQ)(L)(OH) in all the systems studied. The species distribution diagrams were briefly discussed.