Kinetics of the reaction of Ni(II) ions with pyridine in water: a polarographic study

Abstract

The fast ligand-replacement reaction of Ni(II) ion with pyridine in water has been investigated using the reaction-layer treatment of polarographic kinetic currents. Comparison of present results with another polarographic investigation shows discrepancies which are explained. It appears that a surface reaction occurs at the dropping-mercury electrode; by taking this into account we have obtained a rate constant at 25° of 5 × 10³ l. mol^–1 s^–1, and an activation energy of 14 kcal mol^–1, in agreement with the values obtained by stopped-flow methods.