Kinetics of the reaction of the nickel(II) ion with pyridine-2-azo-p-dimethylaniline in t-butanol + water mixtures

Abstract

Rate constants and activation parameters have been determined for the reaction of the nickel(II) ion with pyridine -2-azo-p-dimethylaniline, in a series of t-butanol + water mixtures with mole fractions from 0 to 0.4 t-butanol. The rate constant at 25°C varies little with composition, but the enthalpy and entropy of activation both vary considerably, with compensation; they show maxima and minima, which are discussed in relation to theories of solvent structure.