Kinetics and Mechanism of hydrolysis of Di-Ethyl Dithiophosphate in Acid Media

Abstract

Investigation of diethyl-dithio phosphate was carried out by

using "Allen's" modified method of colorimetry, in aqueous

medium from 0.1 to 7.0 mol dm^–3 HCl at 98ºC. Ionic strength data

exhibit different contribution of neutral species and presence of acid

catalysis. Theoretical rates estimated from 2nd empirical term of

Debye-Hückel equation have been found in close agreement with

experimental rates. Ionic strength, temperature, solvent and concentration

of kinetic studies are provided to identify the reactive species

and molecularity. Molecularity and bond fission are also discussed

in terms of Zücker-Hammett hypothesis. Hammett acidity functions,

Bünnet and Bünnett-Olsen parameters and isokinetic relationship.