STOPPED FLOW KINETICS AND MECHANISTIC STUDY OF PERIODATE DEGRADATION OF PERSIST CARCINOGENIC 2,6 XYLIDINE BY Mn(II) CATALYST

The periodate oxidation of 2,6 xylidine catalyzed by Mn(II) in a solution containing acetone miscible in water was studied using stopped-flow kinetics. The reaction was progressed at 450 nm. The influence of various parameters such as pH, dielectric constant on the reaction was also investigated. Furthermore, various thermodynamic parameters and the value of rate constants were monitored. Tests for quinone, melting point, UV spectra, and FTIR spectrum were used to characterize the final product as 2,6 -dimethyl-p-benzoquinone. Besides, the reaction rate remains unaffected by free radical scavengers. The reaction stoichiometry was reported as 1 mol 2,6-XYL: 2 mol NaIO4. The rate law, that is, d[C]/dt = kK3K4Kw[Mn(II)] [2,6-XYL]0 [IO4 - ]0 [H+ ] / {K2Kw + (Kw+KbK2) [H+ ] + Kb (H+ ) 2} confirms the findings under pseudo-first-order conditions. The 1/kcat versus [H+ ] profile further anticipated the rate law.