Induced functional metallomicelles

The rate of cleavage of 1 has been studied in the absence and presence of metallomicelles of surfactant with tridentate ligand head groups (10 and 11) at a constant pH, but the observed kinetic data are not snfficient to provide a quantitative explanation of these data in terms of a micellar kinetic model. However, these kinetic data may provide a qualitative assessment of catalytic factor (Y) due to aqueous metal ion catalysis (Y ), metal ion-tridentate Ugand complex catalysis (Y ), and metal ion-tridentate ligand surfactant complex catalysis (Y ls), xhns, Y = (k b kg)/k, = (k m - - ko)/ko, and Y ls = 

It is evident from Table 6.3 that the most impressive rate enhancements are due to metal ion-water complex catalysis 100- and 14000-fold rate acceleration due to Zn +-H20 complex and Cu +-H20 complex, respectively. Catalytic effects due to Zn ll or 13 and Cn +12 or 13 complexes are - 1.6- to 5-fold and 10-fold, respectively. Similarly, the catalytic effects due to Zn +-10 or 11 and Cu +-10 or 11 complexes are 2-fold and 5-fold, respectively, which could be easily explained in terms of merely nsual concentration and medium effects of the micromicellar reaction environment. 

Unlike metallomicelles, fnnctional surfactant micelles compared to nonfunctional snrfactant micelles exhibit rate enhancement of many orders. The reason for snch apparent characteristic difference between the catalytic efficiency of metallomicelles and functional snrfactant micelles is the choice of the reference reactions nsed to evaluate the catalytic efficiency of metallomicelles and func- 

Apparent Ligand, Metal Ion, and Metallomicellar Catalytic Factor (Y) for the Hydrolysis 1 at pH 7.25 and 25°C 

Apparent Rate Enhancements (krei) for the Hydrolysis of Amides 

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The studies on the effects of micelles and mixed micelles on the rate of metal ion-ligand complex formation (i.e., the rate of inorganic reactions), as well as the effects of metallomicelles and induced functional metallomicelles on the rate of organic reactions have been carried out extensively during the last nearly five decades. Induced functional metallomicelles are expected to provide impressive... 

Almost all the kinetic studies on metaUomiceUar-mediated reactions have been carried out in the presence of either nonfunctional metallomicelles in which micellar head groups are incapable of acting as ligands for metal-ligand complex formation or induced functional metaUomiceUes in which micellar head groups act as effective ligands for metal-Ugand complex formation. 

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