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

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