Micellar catalyzed hydrolysis of mono-2,3-dichloroaniline phosphate

ABSTRACT

The kinetics of micellar catalyzed hydrolysis of mono-2,3-dichloroaniline phosphate in the presence of different surfactants has been studied at 303 K. The rate of reaction has been found to be first order with respect to both [substrate] and [HCl]. The cationic micelles of cetylpyridinium chloride (CPC), anionic micelles of di-octyl sodium sulphosuccinate (AOT), and non-ionic micelles of polyoxyethylene sorbitan monooleate (Tween 80) enhanced the rate of reaction to a maximum value and after that the increase in concentration of surfactant decreased the reaction rate. The applicability of different kinetic models has been tested to explain the observed micellar effects. The various thermodynamic activation parameters (E_a, ΔH^≠, ΔS^≠, ΔG^≠) have been evaluated. The added salts viz. KCl, KNO₃, K₂SO₄ enhanced the rate of reaction in the presence of CPC, AOT, and Tween 80 micelles. The kinetic parameters were determined from the rate (surfactant) profile and a suitable mechanism consistent with the experimental finding has been proposed.

GRAPHICAL ABSTRACT

KEYWORDS:

• Hydrolysis
• mono-2,3-dichloroaniline phosphate
• Menger–Portnoy’s
• Piszkiewicz’s and Berezin models

Acknowledgments

The authors are thankful to the Pt. Ravishankar Shukla University, Raipur, for providing University Fellowship to one of the authors (Nisha Chhetri) and also grateful to Head of School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur (India) for providing laboratory facilities.

Additional information

Funding

This work was supported by Pt Ravishankar Shukla University Fellowship: [Grant number 1415/ Fin./2016].