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Research Article | Open Access
Volume 5 | Issue 1 | https://doi.org/10.15228/2015.v05.i01.p01
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Comparative Kinetic and Mechanistic Study of Oxidation of β-Cyclodextrin by Potassium Dichromate
R. Naz
Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan.
R. Azmat
Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan.
N. Qamar
Department of Chemistry, Jinnah University for Women, 74600 Karachi, Pakistan
H. Jaffery
Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan.
S. Nisar
Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan.
| Received 06 Mar, 2015 |
Accepted 21 Sep, 2015 |
Published 06 Dec, 2015 |
ABSTRACT:
A comparative kinetic and mechanistic study of oxidation of β-Cyclodextrin (β-CD) by Potassium Dichromate (K2Cr2O7) in presence of aqueous H2SO4 medium was monitored at λmax 350 nm spectrophotometrically. The oxidation reaction follows first order kinetics with respect to [β-CD] and [Cr2O7 -2 ] and markedly increased by increasing [H+ ]. The slow reaction was accelerated with Fe (III) as a catalyst that enhances the rate significantly. The results of varying temperature were used to compute different activation parameters. The values of activation energy Ea were 37.70KJ mol-1 for catalysed and 50.183 KJ mol-1 for uncatalysed reactions. These clearly indicate that Fe (III) greatly reduced the activation barrier thereby increases the rate of reaction. Oxidation product results due to the oxidation of -CH2OH group present on each glucose monomer of β-CD.A mechanism consistent with kinetic and thermodynamic data is also proposed that involves two-electron reduction of Cr (VI).
How to Cite this paper?
APA-7 Style
Naz, R., Azmat, R., Qamar, N., Jaffery, H., & Nisar, S. (2015). Comparative Kinetic and Mechanistic Study of Oxidation of β-Cyclodextrin by Potassium Dichromate. Pakistan Journal of Chemistry, 5(1). https://doi.org/10.15228/2015.v05.i01.p01
ACS Style
Naz, R., Azmat, R., Qamar, N., Jaffery, H. and Nisar, S., 2015. Comparative Kinetic and Mechanistic Study of Oxidation of β-Cyclodextrin by Potassium Dichromate. Pakistan Journal of Chemistry, 5(1). https://doi.org/10.15228/2015.v05.i01.p01
AMA Style
Naz R, Azmat R, Qamar N, Jaffery H, Nisar S. Comparative Kinetic and Mechanistic Study of Oxidation of β-Cyclodextrin by Potassium Dichromate. Pakistan Journal of Chemistry. 2015 Mar 1;5(1). https://doi.org/10.15228/2015.v05.i01.p01
Chicago/Turabian Style
Naz, R., R. Azmat, N. Qamar, H. Jaffery, and S. Nisar. “Comparative Kinetic and Mechanistic Study of Oxidation of β-Cyclodextrin by Potassium Dichromate.” Pakistan Journal of Chemistry 5, no. 1 (2015). https://doi.org/10.15228/2015.v05.i01.p01
This work is licensed under a Creative Commons Attribution 4.0 International License.