European Journal of Chemistry 2013, 4(3), 292-296. doi:10.5155/eurjchem.4.3.292-296.795

Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium


Alaa Eldin Mokhtar Abdel-Hady (1,*)

(1) Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Sinai University, Arish City, 45518, Cairo, Egypt
(*) Corresponding Author

Received: 11 Apr 2013, Accepted: 15 Jun 2013, Published: 30 Sep 2013

Abstract


The kinetics of oxidative degradation of Rhodamine-B (RhB) by N-bromosuccinimide (NBS) in aqueous alkaline and H2O-MeOH solvent mixtures were studied spectrophotometrically over the 20-40 °C range, 0.1-0.4 mol/dm3 ionic strength, 11.3-12.1 pH range and 0-30 wt% MeOH-H2O solvent mixtures for a range of NBS and Rhodamine-B concentrations. The rate of reaction showed first order dependence on both [NBS], [RhB] and inverse first order dependent upon [OH-]. The rate decreased with decreasing the dielectric constant of the medium and was independent on the ionic strength over the range studied. An inner-sphere mechanism in which the protonated Rodamine-B, (RhBH+) was considered as the main reactive species is proposed.

4_3_292_296

Keywords


Kinetics; Oxidation; Rhodamine-B; N-Bromosuccinimide; Oxidative degradation; Inner-sphere mechanism

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DOI: 10.5155/eurjchem.4.3.292-296.795

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[2]. Alaa Eldin Mokhtar Abdel-Hady
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How to cite


Abdel-Hady, A. Eur. J. Chem. 2013, 4(3), 292-296. doi:10.5155/eurjchem.4.3.292-296.795
Abdel-Hady, A. Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium. Eur. J. Chem. 2013, 4(3), 292-296. doi:10.5155/eurjchem.4.3.292-296.795
Abdel-Hady, A. (2013). Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium. European Journal of Chemistry, 4(3), 292-296. doi:10.5155/eurjchem.4.3.292-296.795
Abdel-Hady, Alaa. "Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium." European Journal of Chemistry [Online], 4.3 (2013): 292-296. Web. 20 Aug. 2019
Abdel-Hady, Alaa. "Kinetics of oxidative degradation of Rhodamine-B by N-bromosuccinimide in aqueous alkaline medium" European Journal of Chemistry [Online], Volume 4 Number 3 (30 September 2013)

DOI Link: https://doi.org/10.5155/eurjchem.4.3.292-296.795

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