Kinetics of the dissociation of tris(2,2'-bipyridyl)iron(II) and tris(1,10-phenanthroline)iron(II) in the reverse micelles of Tween-85 in cyclohexane

Department of Chemistry. S.R.V.B.S.J B.M.R. College. Peddapuram-533 437, East Godavari District,

Andhra Pradesh, India

Manuscprit received 28 January 2009, revised 31 March 2009, accepted 27 April 2009

Dissociation of the aqueous complexes of tris(2,2'-bipyridyl) and tris(1,10-phenanthroline)iron(II) takes place with appreciable rate in the presence of reverse micelles of Tween-85 in cyclohexane-water mixtures. The rate of dissociation increases with increase in the concentration of Tween-85 at constant W ( = [Water]/[Tween-85]) and decreases with increase in W at constant [Tween-85]. The results are in support of the mechanism envisasing the binding of the complex on the micellar interface, the micellar surface catalysing the dissociation of metal-ligand bond. The binding constants of the complexes on the micellar interface have been evaluated.