A. K. Sisodia

Bio: A. K. Sisodia is an academic researcher from Allahabad University. The author has contributed to research in topics: Aqueous solution & Ruthenium(III) chloride. The author has an hindex of 2, co-authored 6 publications receiving 55 citations.

A kinetic study of osmium tetroxide catalysed oxidation of methyl digol and ethyl digol by hexacyanoferrate (III) in aqueous alkaline medium

Abstract: The osmium tetroxide catalysed reactions of alkaline hexacyanoferrate. (III) with methyl digol and ethyl digol were investigated kinetically. The reactions are zero order in hexajanoferrate (III) and of first order in substrate and osmium tetroxide concentrations. With an increase in [math] the rate increased and the reaction showed positive intercept at Y-axis. An inner-sphere mechanism involving complex formation, which then disproportionates to form the products, is suggested.

Kinetics of oxidation of methyl digol and ethyl digol by alkaline hexacyanoferrate (III) ion with ruthenium (III) chlorides as a homogeneous catalyst

Abstract: The ruthenium(IIl) chloride catalysed reactions of alkaline hexacyanoferrate(III) with methyl digol and ethyl digol were investigated kinetically. An inner sphere mechanism involving complex formation between digol molecule and ruthenium(III) species, which then disproportionates to carbonium ion and ruthenium(III) hydride is suggested. The carbonium ion results the corresponding aldehyde with one molecule of hydroxide ion where as ruthenium(III) hydride undergoes rapid oxidation with hexacynoferrate(III) yielding origina ruthenium(III) species and hexacyanoferrate(II) ion.

Kinetic modeling of the oxidation of p-hydroxybenzoic acid by Fenton's reagent: implications of the role of quinones in the redox cycling of iron.

Abstract: As Fenton (and Fenton-like) chemistry is increasingly implicated in a variety of areas and applications, an understanding of the mechanism and rates governing the system becomes relevant for a growing number of disciplines and purposes. In this work a kinetic model capable of describing species concentrations measured experimentally during the Fenton-mediated oxidation of p-hydroxybenzoic acid (pHBA) is presented and discussed. Experiments were conducted in the dark at low pH using reagent and substrate concentrations ranging from 100 μM to 2 mM. Analysis of the experimental and modeling results reveals that redox reactions between Fe and quinone or quinone-like compounds are essential for the model to qualitatively predict species concentration profiles observed in the laboratory. The quinone and quinone-like compounds generated as byproducts during the oxidation of pHBA act as reducing agents toward Fe(III), thereby assisting the redox cycling of Fe and increasing degradation of the target substrate. Th...

Kinetic, mechanistic and spectral investigations of ruthenium(III)/osmium(VIII)-catalysed oxidation of paracetamol by alkaline diperiodatoargentate(III) (stopped flow technique)

Abstract: The kinetics of the oxidation of ruthenium(III)- and osmium(VIII)-catalysed oxidation of paracetamol by diperiodatoargentate(III) (DPA) in aqueous alkaline medium at a constant ionic strength of 0.10 mol dm −3 was studied spectrophotometrically. The reaction between DPA and paracetamol in alkaline medium exhibits 2:1 stoichiometry in both catalysed reactions (DPA:PAM). The main products were identified by spot test, IR, NMR and GC–MS. Probable mechanisms are proposed and discussed. The activation parameters with respect to the slow step of the mechanism are computed and discussed and thermodynamic quantities are also calculated. It has been observed that the catalytic efficiency for the present reaction is in the order of Os(VIII) > Ru(III). The active species of catalyst and oxidant have been identified.