The kinetics and mechanism of the electron transfer ofdl-Aspartic acid (Asp) by Mn (VII) in alkaline medium has been studied spectrophotometrically over the range2.0≤103[Asp]≤5.0 mol dm−3;0.01≤[OH-]≤0.05 mol dm−3;298≤T≤318 K andI=0.05 mol dm−3(KNO3). The reaction exhibits first-order dependence in[MnO4-]Tbut shows fractional-order dependence in both[Asp]Tand[OH−]T. The reaction was studied in the presence of sodium dodecyl sulfate (SDS); an increase in the rate with the increase in the micellar concentration was observed. The products were characterized by spectral analysis. A mechanism involving free radicals is proposed. Asp bindsMnO4-to form a complex that subsequently decomposes to products. Activation parametersΔH° (kJ mol−1) andΔS° (JK−1 mol−1) for the reaction are5.62±0.35and−227.65±1.1, respectively. The negative value ofΔS° indicates that oxidation occurs via inner sphere mechanism.
The kinetics of electron transfer reaction of diclofenac sodium with 12-tungstocobaltate (III) complex has been studied spectrophotometrically over the range 2.0 × 10 -3 ≤ [diclofenac sodium] ≤ 6.0 × 10 -3 mol/L, 6.03 ≤ pH ≤ 8.0 and at 293 ≤ T ≤ 308 K in aqueous medium at constant ionic strength I (0.5 mol/L sodium perchlorate). The electron transfer reaction showed pseudo-first order dependence in [diclofenac sodium] and [12-tungstocobaltate(III)] and less than unit order in [OH -]T. The activation parameters calculated for the electron transfer reaction favoured the formation of a precursor complex between the reactants. The product is characterized by FTIR and NMR spectra and is found to be [2-(2,6-dichloro phenylamino)phenyl]methanol.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.