Some new triorganobismuth (V) amide were synthesized by earlier reported method and fully characterized by their elemental and I.R. spectral analysis along with their antimicrobial activity against different pathogenic bacterial and fungal strains and in-vitro antitumor activity against human breast and mammary cancer cell line. It was found that compounds have great potential as antitumor and antimicrobial agents.
The present manuscript deals the kinetics and mechanism of the reaction between crotonic acid and ceric perchlorates. The order
of the reaction with respect to Ce (IV) is unity but the rate is dependent on the initial concentration of the Ce (IV). The spectrophotometric
investigation has been also carried out which negatived the intermediate complex formation. The main reaction species of Ce (IV) involved
in rate determining step was the hydrated uncomplexed ceric ion which at higher initial concentration gets dimerises.
The present manuscript deals the kinetics of the oxidation of levulinic acid by Ce (IV) perchlorates in perchloric acid. The reaction
follows a first order rate dependence on the Ce (IV) concentration but the value of k1 decreases with the increasing concentration of Ce (IV).
Evidence for complex formation between Ce (IV) and levulinic acid was obtained from the Michaelies-Menten reciprocal plots. This was
further confirmed spectrophotometrically where the absorption intensity in the wave length region 212 mμ-216 mμ, was intensified as compared
to absorption spectra of Ce(IV)perchlorate under identical conditions with an increase in [H+], the rate increases and a plot between
[HClO4 ] -1 and k1-1 is a straight line intercepting the ordinate. The reaction shows a positive salt effect. A suitable mechanism has been
postulated and the values of activation parameters are reported.
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