Kinetics and Mechanism of the Oxidation of Propan-1-ol and Propan-2-ol by Permanganate in the Absence and Presence of Tween-20 in Perchloric Acid Medium

Abstract

The kinetics of the oxidation of propan-1-ol and propan-2-ol by KMnO 4 in HClO 4 medium has been studied in absence and presence of Tween-20. In the absence of Tween-20 the reaction is of first order with respect to each of permanganate and H + , but of complex order with respect to substrate. The active oxidant species HMnO 4 reacts with the alkanol molecule to form an intermediate complex, which decomposes in the rate-determining step to form the respective product and Mn v . In the presence of Tween-20, both the oxidant and the substrate are distributed between the aqueous phase and the micellar pseudo-phase and then react. Different kinetic and thermodynamic parameters have been evaluated. Compensation between water structure destruction and substrate-micelle interaction plays an important role in the presence of the surfactant.

Influence of Microheterogeneous Environments of Sodium Dodecyl Sulfate on the Kinetics of Oxidation of l-Serine by Chloro and Chlorohydroxo Complexes of Gold(III)

“…Hence it may be assumed that ( K Ser + K Au(III) ) ≈ K Ser . Thus, the value of Δ H 0 mentioned above is possibly the enthalpy change due to binding of serine with SDS micelle . The small negative value of Δ H 0 may be owing to the slightly greater energy release due to serine–micelle binding (when it enters the Stern layer) than the absorption of energy due to the water structure breaking around serine when it goes from aqueous phase to micellar pseudophase.…”

“…Thus, the value of ΔH 0 mentioned above is possibly the enthalpy change due to binding of serine with SDS micelle. 76 The small negative value of ΔH 0 may be owing to the slightly greater energy release due to serine−micelle binding (when it enters the Stern layer) than the absorption of energy due to the water structure breaking around serine when it goes from aqueous phase to micellar pseudophase. Also during the transfer of serine from aqueous to micellar pseudophase, the desolvation process increases the entropy while the binding of serine with SDS micelle increases the structuring (decrease of entropy).…”

Reliable chemical bath deposition of ZnO films with controllable morphology from ethanolamine-based solutions using KMnO4 substrate activation

“…Ethanol gave rapid precipitation of manganese oxide while isopropanol had no effect -different alcohols exhibit very different reaction rates with permanganate. 18,21 ) We also note that strongly acidic or alkaline alcohol-free solutions react too rapidly leading to non-uniform activation, but it is likely that suitable pH ranges, both acid and alkaline, will be effective. The vials were closed and placed either in a water bath at 85 C or left at room temperature for 20 min (unless otherwise stated).…”

Kinetic study of oxidation of galactose by N-bromo phthalimide in the presence of cationic micelle in acidic medium

“…The concentration of CTAB at which the maximum would be the kinetic CMC of the surfactant in the presence of the Gal and from the graph the kinetic CMC value for Gal was found to be 8.5 9 10 -4 mol l -1 in reaction mixture [36]. The difference among the CMC values arises from the wellknown effect of added electrolyte, which lowers the CMC by causing a decrease in the repulsion between the polar head groups at the micelle surface.…”