Abstract
The kinetic investigation of Os(VIII) accelerated oxidation of L-phenylalanine (L-Pheala) by hexacyanoferrate(III) (HCF(III)) in CTAB micellar medium was carried out by measuring the decrease in absorbance at 420 nm, which corresponds to HCF(III). By adjusting one variable at a time, the progression of the reaction has been inspected as a function of [OH−], ionic strength, [CTAB], [Os(VIII)], [L-Pheala], [HCF(III)], and temperature using the pseudo-first-order condition. The results show that [OH−], [CTAB], and [L-Pheala] are the critical parameters with a discernible influence on reaction rate. The reaction exhibits first-order kinetics in the examined concentration range of Os(VIII), HCF(III), as well as at lower [L-Pheala] and [OH−], but follows less than unit order at higher concentrations of L-Pheala and alkali. The incremental trend in reaction rate with electrolyte concentration demonstrates a positive salt effect. CTAB significantly catalyzes the process, and once at a maximum, the rate remains almost constant as [CTAB] increases. The observed decrease in CTAB CMC could be attributed to reduced repulsion between the positively charged heads of surfactant molecules caused by the negatively charged HCF(III) and OH−. The activation values also support our proposed outer-sphere electron transport mechanism.
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Srivastava, A., Goswami, M.K., Tiwari, D. et al. Rate enhancement of Os(VIII) catalyzed L-phenylalanine oxidation by hexacyanoferrate(III) by CTAB micellar medium: a kinetic study. Monatsh Chem 154, 1243–1251 (2023). https://doi.org/10.1007/s00706-023-03124-w
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DOI: https://doi.org/10.1007/s00706-023-03124-w