A Kinetics Study of Solvent Effect on solventsolute interaction and mechanism of the Iondipolar reaction in an aquo-organic co solvent system
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 1
Abstract
A kinetic study of solvolysis reaction of methyl salicylate in water-DMF solvent using different concentration of DMF (v/v) was made at four different temperatures i.e., 200 C, 250 C, 300 C, 350 C & 400 C. The rate of reaction decreases with increase of DMF content of the media. The dielectric effect and solvation change were held responsible for such depletion in the rate. The Iso-composition-Activation energy was found to be decreasing from 57.65 to 53.45 KJ/mole with gradual addition of organic co-solvent, the solvation and desolvation of transition and initial state respectively are responsible for depletion in the value of Iso-composition-Activation energy of the reaction. The number of water molecule associated with the activated complex are found to be decreasing from 1.63 to 1.41 with increase in the temperature from 200 C to 400 C and this indicated that the mechanistic path followed by the reaction change from uni-molecular to bimolecular. The Enthalpy of Activation (H*), Entropy of Activation (S*) and free energy of activation (G*) were also calculated.
Authors and Affiliations
A. K. Singh
Keywords
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