Kinetics of Complexation of Ni(II) with N,N´ -Ethylene disalicylamide in Alkaline Media and Effect of Cationic Surfactant on the Rate of Reaction

Abstract

The kinetics of formation reaction of N,N´-ethylene disalicylamidato

nickelate(II) is followed at 30ºC in alkaline media. A bellshaped

pH-rate profile is obtained indicating a maximum at pH =

9.5. The active species near the maximum are the hydrated Ni(II)

species and the deprotonated species of the ligand. The rate constant

for formation decreases with increase in concentration of cetyl

trimethyl ammonium bromide (CTAB). This results from partitioning

of the hydrophobic ligand in the micellar pseudophase and

electrostatic repulsion between the metal and the micellar surface.