Stopped Flow Kinetics of MnII Catalysed Periodate Oxidation of 2, 3- dimethylaniline - Evaluation of Stability Constant of the Ternary Intermediate Complex

• Main Authors: Rajneesh Dutt Kaushik, Richa Agarwal, Priyanka Tyagi, Om Singh, Jaspal Singh
• Format: Article
• Language: English
• Published: Diponegoro University 2015-03-01
• Series: Bulletin of Chemical Reaction Engineering & Catalysis
• Subjects: Stopped flow kinetics; Stability constant; Ternary complex; MnII catalysed; Periodate oxidation; 2, 3- dimethylaniline
• Online Access: http://ejournal.undip.ac.id/index.php/bcrec/article/view/7621

<p>The formation of ternary intermediate unstable complex during the oxidation of aromatic amines by periodate ion catalysed by Mn^II has been proposed in case of some anilines. This paper is the first report on stopped-flow kinetic study and evaluation of stability constant of ternary complex forming in the Mn^II - catalysed periodate oxidation of 2, 3-dimethylaniline (D) in acetone-water medium. Stop-flow spectrophotometric method was used to study the ternary complex formation and to determine its stability constant. The stop-flow trace shows the reaction to occur in two steps. The first step, which is presumably the formation of ternary complex, is relatively fast while the second stage is relatively quite slow. The stability constant evaluated for D - Mn^II- IO₄^- ternary complex by determining  equilibrium absorbance is (2.2 ± 1.0) × 10⁵. Kinetics of ternary complex formation was defined by the rate law(A)  under pseudo first order conditions.</p> <p>ln{[C₂]_eq/ ( [C₂]_eq -[C₂])} = <em>k_obs</em> . <em>t</em> (A)</p> where, <em>k_obs</em> is the pseudo first order rate constant, [C₂] is concentration of ternary complex at given time <em>t</em>, and [C₂]_eq is the equilibrium concentration of ternary complex. © 2015 BCREC UNDIP. All rights reserved<p><em>Received: 3rd October 2014; Revised: 4th December 2014; Accepted: 15th December 2014</em></p><p><strong>How to Cite</strong>: Kaushik, R.D., Agarwal, R., Tyagi, P., Singh, O., Singh, J. (2015). Stopped Flow Kinetics of MnII Catalysed Periodate Oxidation of 2,3-dimethylaniline - Evaluation of Stability Constant of the Ternary Intermediate Complex. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 10 (1): 78-87. (doi:10.9767/bcrec.10.1.7621.78-87)</p><p><strong>Permalink/DOI</strong>: <a href="http://dx.doi.org/10.9767/bcrec.10.1.7621.78-87">http://dx.doi.org/10.9767/bcrec.10.1.7621.78-87</a></p>