Ru(III)-Catalyzed L-Glutamic Acid Oxidation by Hexacyanoferrate(III) in an Anionic Surfactant Medium: A Kinetic and Mechanistic Approach

In SDS micellar medium, the kinetic investigation of Ru(III) promoted oxidation of L-glutamic acid (Glu) by [Fe(CN) 6 ] 3– was carried out by recording the decline in absorbance at 420 nm, which corresponds to [Fe(CN) 6 ] 3– . By adjusting one variable at a time, the progression of the reaction has been inspected as a function of [OH – ], ionic strength, [SDS], [Ru 3+ ], [Glu], [Fe(CN) 6 ] 3– , and temperature using the pseudo-first-order condition. The findings demonstrate that [OH – ], [SDS], and [Glu] are the key parameters that have a discernible impact on reaction rate. In the studied concentration range of Ru(III), [Fe(CN) 6 ] 3– , and at lower [Glu] and [OH – ], the reaction displays first-order kinetics. The incremental trend in reaction rate with electrolyte concentration demonstrates a positive salt effect. In SDS micellar medium as compared to the aqueous medium, the reaction rate is nearly four times faster. As both, [Fe(CN) 6 ] 3– and the polar head of SDS have complementary negative charges, [Fe(CN) 6 ] 3– has no discernible influence on the CMC of SDS. The CMC of SDS is reduced by the K + produced from K 3 [Fe(CN) 6 ] and KNO 3 , which reduces the repulsion between the surfactant molecules' negatively charged heads.