Kinetics of dissociation of tris - (2, 2'-bipyridyl) and tris - (1,10-phenanthroline) iron (II) complexes in the presence of OH¯ in the water pools of CTAB reverse micelles

Abstract

The kinetic study of the dissociation of tris (2,2'-bipyridyl) and tris (1,10 -phenanthroline) complexes in the presence of OH¯ ion in the water pools of CTAB reverse micelles in hexanechloroform mixtures has been carried out. The former reaction has OH¯<i> </i>independent and dependent paths whereas the latter has only OH¯dependent path. The special property of the water pool, the lower polarity (than water), has effect on kinetics. The increase in molar ratios of [water]/[surfactant] (= W) results in decrease in rate of the OH¯<i> </i>independent path. On the other hand, an increase in W results in increase in rate of OH¯<i> </i>dependent path. The kinetic analysis of this effect has been carried out considering the effects of dielectric constant and ionic strength of water pool on

the rates. The results show that increase in rate due to decrease in ionic strength predominates over the effect of increase in dielectric constant with increase in W. The dissociation of tris (1,10-phenanthroline) iron(II) does not have OH¯<i> </i>independent path and the effect of W on this reaction is identical with that of

OH¯ - dependent path of the former reaction.