Determination of the Stability Constant of Vanadium (V) with Alaine

Document Type : Research Article


1 Iranian Research & Development Center for Chemical Industries, Jahad Daneshgahi Inst., Sharif University of Technology, Tehran I.R. IRAN

2 Department of Chemistry, Shahid Beheshti University, Tehran, I.R. IRAN

3 Teacher Training University, Tehran, I.R. IRAN



Formation equilibria of dioxy vanadium (V) complex with alanine in acidic media (pH<2.3) has been investigated potentiometrically and spectrophotometrically. In this condition the 1:1 complex has the formula VO2Y, where Y¯ represent the fully dissociated aminocarboxylate anion. The stability constant of VO2Y was determined as log KVO2Y=11.32±0.35 at 25±0.1 °C and I=1 mol per liter of sodium perchlorate. The protonation constant of alanine was also determined poteniumetrically under above condition.