Investigation on Kinetics and Mechanism of Metal Exchange Reaction of Copper (II) Ions and NiL

In this study, the electron spectrum in UV-Vis region is used to study the kinetics of metal exchange reaction between ion cu2+ and additional concentration of NiL complex. This complex is soluble in dimethyl formamid solution with ionic strength of 0.1M KNO3. The kinetic data of this reaction proves that the metal exchange is a two-step reaction. The value of the kinetic constant, k, is proportional with [NiL] at low concentration of NiL. At higher higher concentration of NiL ([NiL]>>[Cu2+]), this direct relation does not exist, so k is independent of [NiL]. The second order reaction is converted to pseudo first order reaction with the rate constant of kobs. Based on the experimental data, the values of kobs are computed. Then kobs is expressed as a function of [NiL]. According to these results, the mechanism of metal exchange reaction is suggested