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|Title:||Reactions in micellar solutions: Part 11 - Effects of surfactants on kinetics of reversible complexation of trans-(aquo)(sulphito-S )bis(ethylenediamine)- cobalt(III) with azide, thiocyanate and thiosulphate in aqueous medium|
|Authors:||Dash, Anadi C|
Mohammed, Sk. Sazid
|Abstract:||The kinetics of reversible ligand substitution of coordinated water in trans-[H2O-Co(en)2SO3]+ by NCS-, N3 and S2O has been investigated in the presence of neutral (triton X-lOO), anionic (SDS) , and cationic (CTAB) surfactants. The neutral micelles have no perceptible effects on both formation and dissociation rates of the anated species while both anionic and cationic micelles retard the rate of formation of anated species. Data analysis indicates that the reaction, trans-[(OH2)Co(en)2SO3]+ +xn - trans[X- Co(en)2SO3]n-1, occurs in the aqueous pseudophase while the substrate or the nucleophile (xn- ) is partitioned between the ionic micellar pseudophase and the bulk aqueous phase by a pseudophase ion exchange equilibrium. The pseudophase ion exchange equilibrium constant for the complex ion (C+)/Na+ exchange in the presence of SDS micelles turns out to be 8 ± 2 at 25°C irrespective of anionic nucleophiles.|
|Appears in Collections:||IJC-A Vol.30A(08) [August 1991]|
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