OXIDATION BEHAVIOR OF L-THREONINE BY N-BROMOPHTHALIMIDE IN MICELLAR SYSTEM OF CTAB
The effect of cationic surfactant Cetyltrimethylammonium bromide (CTAB) molecules on the oxidation of L-threonine by N- bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and fractional positive order on L-threonine and negative fractional order dep...
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| Autores principales: | , , , |
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| Lenguaje: | English |
| Publicado: |
Sociedad Chilena de Química
2013
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072013000100005 |
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| Sumario: | The effect of cationic surfactant Cetyltrimethylammonium bromide (CTAB) molecules on the oxidation of L-threonine by N- bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and fractional positive order on L-threonine and negative fractional order dependence on HClO4. The effects of KCl, KBr, phthalimide, mercuric acetate and dielectric constant of the medium have also been studied and summarized. CTAB strongly catalyzes the reaction and after achieving a maximum the rate remains almost constant at higher concentrations of CTAB. This micellar effect has been analyzed, plotted and results are treated quantitatively in terms of Berezin model. The various activation parameters in presence and absence of CTAB have been also evaluated. A suitable mechanism along with rate law consistent with the experimental findings has been worked out. Based on the model association rate constants have been computed. |
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