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Kinetics and mechanism of ninhydrin reaction with copper(II) complexes of glycine and α-alanine. Elucidation of the template mechanism

✍ Scribed by Dileep Gupta; Zaheer Khan; A. Aziz Khan

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
378 KB
Volume
25
Category
Article
ISSN
0538-8066

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✦ Synopsis

Ninhydrin has been found to react with Cu(glycine)+ and Cu(alanine)+ in the ratio of 1:l. The kinetic studies of the reaction were carried out at different concentrations of the reactants at 80°C (pH = 5.0). The reaction proceeds through the formation of a ternary labile complex of ninhydrin with Cu(I1) complexes of glycine and alanine. The kinetics were found to follow pseudo-first-order reaction:.path with respect to Cu(I1)-complex in presence of excess [Ninhydrin]. Formation of a ternary labile complex indicates a template reaction mechanism based on the reactions with coordinated ligands. The variation of pseudo-first-order rate constants with [ninhydrin] was found to be in good agreement with equation

where B1 and B2 are the unknown empirical parameters. The [acetate ion1 has no significant effect on the rate constants. On the basis of observed data a probable mechanism has been proposed.

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