Vol. 2, Issue 6 (2017)
A kinetic study on the complexation of Cu(II) with α-Aminobenzoic acid
Author(s): Yogeshwar Sharma
Abstract: The kinetics of complexation of Cu(II) with α-Aminobenzoic acid has been investigated at 25, 30, 35 and 40± 0.05°C in the pH range 2.12-4.65 using Aminco Morrow Stopped Flow Spectrophotometer. The anionic form of α-Aminobenzoic acid is more reactive and the protonated form interacts only to a small extent. Kinetic results indicate that the ligand is not involved in the rate determining step which is, in fact, associated with the release of a water molecule from the shell of the metal ions prior to complexation with the ligand. The values of activation parameters corresponding to stepwise rate constants have also been evaluated. Energy of the molecule and heat of formation were also calculated. A mechanism consistent with the kinetic data has been suggested.