• K De

      Articles written in Journal of Chemical Sciences

    • Kinetics and mechanism of anation ofcis-diaquo-bis-oxalatochromate(III) ion byDL-alanine in ethanol-water mixtures of varying dielectric constant

      S Mitra (Mazumdar) K De

      More Details Abstract Fulltext PDF

      The kinetics of the anation reaction of cis-diaquo-bis-oxalatochromate(III) ion by DL-alanine has been studied spectrophotometrically in the pH range 3.8 to 7.3, where DL-alanine remains in zwitterionic form. A second-order rate law has been established. Reaction rates in three different ethanol-water mixtures were measured. In each solvent medium the anation rate is higher as compared to water exchange reaction at a particular temperature. The activation parameters (gDH# and ΔS#) in different ethanol-water mixtures were obtained from Eyring plots. ΔG#(ΔH#TΔS#) values were calculated in each solvent medium and compared with that of the isotopic water exchange process. A reaction mechanism involving theSN2 path has been suggested.

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