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Abstract

KINETICS AND MECHANISM OF HYDROLYSIS OF TRI-4- CHLOROTHIOPHENYL PHOSPHATE ESTER VIA CONJUGATE ACID SPECIES

Asha Verma and Firdous Andleep*

ABSTRACT

Hydrolysis of Tri-4-chlorothiophenyl phosphate ester has been carried out in the region of 0.1-7.0 mol dm-3 HCl at 980C. Acid log rate profile has a maximum at 4.0 mol dm-3 HCl and then decreases after 4.0 mol dm-3 HCl. This decrease in rate is attributed to water activity and negative effect of ionic strength. The theoretical and observed rates estimated from second empirical term of Debye- Huckle equation have been found to be in close agreement. Bimolecularity of the reaction has been determined from Arrhenius parameters and molecularity data. The triester involves P – S bond fission which is strengthened by comparative kinetic data.

Keywords: Tri-4-chlorothiophenyl phosphate, bimolecularity, trimester, Arrhenius parameter.


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