Effect of cationic surfactant on Ru(III) catalyzed L‐glutamic acid oxidation by hexacyanoferrate(III)
Abhishek Srivastava, Madhav Krishna Goswami, Rajeev Kumar Dohare, Neetu Srivastava, Krishna Srivastava
Abstract
Abstract In CTAB 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, [CTAB], [Ru 3+ ], [Glu], [Fe(CN) 6 3− ], and temperature using the pseudo‐first‐order condition. The findings demonstrate that [OH − ], [CTAB], 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. CTAB substantially catalyzes the process, and after reaching a maximum, the rate remains nearly constant at increased [CTAB]. The observed decline in the CMC of CTAB may be caused by the reduced repulsion between the positively charged heads of the surfactant molecules caused by the negatively charged OH − , and [Fe(CN) 6 ] 3− . The activation parameters also support the outer‐sphere electron transfer mechanism as recommended by us.