Kinetic investigation on alkaline hydrolysis of tris-(2,2 '-bipyridine)iron(II) in CTAB reverse micellar media

摘要

The alkaline hydrolysis of tris-(2,2'-bipyridyl)iron(II) complex has been studied in the CTAB/1-butanol-heptane reverse micellar media. The reaction obeys second-order kinetics: first order with respect to each of complex and alkali. Observed pseudo-first order rate constant (k(obs)) has been determined at different values of Wand Z. Rate initially increases and then decreases with increase in W, showing a maximum at W = 7.41. Concentration of CTAB, at constant values of Wand Z, has no effect on reaction rate; indicates that the reaction occurs inside the reverse micellar cavity of water pool. Below W = 7.41, both the rate of dissociation and alkaline hydrolysis proceed parallel with a moderate speed. With the increase in Z, concentration of butanol in the water pool increases; decreases the micro-polarity of the water pool and hence increases the rate. The kinetic results are interpreted using the pseudo-phase model. (C) 2015 Elsevier B.V. All rights reserved.