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Micelle-Catalyzed Interaction Between [Ni(II)-Gly-Gly]+ and Ninhydrin
Authors:Mohd. Akram  Neelam Hazoor Zaidi
Affiliation:Department of Chemistry , Aligarh Muslim University , Aligarh, India
Abstract:The effect of cationic micelles of cetyltrimethyl ammonium bromide (CTAB) on the observed pseudo-first-order rate constant for the interaction of nickel dipeptide complex [Ni(II)-Gly-Gly]+ with ninhydrin has been studied spectrophotometrically. At constant temperature and pH, increase in the [CTAB] from 0.0 to 60.0 × 10?3 mol dm?3 caused nearly three-fold increase of the rate constant. The micellar catalysis is explained in terms of the pseudophase model. From the observed kinetic data, binding constants of micelle–[Ni(II)-Gly-Gly]+ (K S), and micelle–ninhydrin (K N) are evaluated, respectively, to be 5.3 mol?1 dm3 and 84.0 mol?1 dm3. The role of added inorganic (NaCl, NaBr, Na2SO4) and organic salts (NaBenz, NaSal) on the reaction rate has also been examined.
Keywords:Catalysis  CTAB  dipeptide  micelles  ninhydrin  [Ni(II)-Gly-Gly+]
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