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The formation constants of species formed in the system H+ + alanine and VO2+ +alanine have been determined in aqueous solution for 1.0

The stability constants of the systems dioxovanadium(V) with alanylalanine, alanylglycine, and alanine have been determined in aqueous solution in 0.8 ≤ pH ≤ 5 at 25°C and 0.1 mol-dm−3 (NaClO4), using a combination of potentiometric and spectrophotometric techniques. The compositions of the formed complexes were determined and it was shown that dioxovanadium(V) forms two mononuclear 1:1 and 1:2 species with alanine of the type VO2L and VO2L2−, and two mononuclear 1:1 complexes with alanylpeptides of the type VO2HL and VO2L−.