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Kinetics and Mechanism of Palladium(II)-Catalyzed Oxidation of Inositol by Hexachloroplatinate(IV) in Perchlorate Solutions
American Journal of Applied Chemistry
Volume 4, Issue 5, October 2016, Pages: 185-191
Received: Aug. 29, 2016; Accepted: Sep. 8, 2016; Published: Sep. 24, 2016
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Authors
Ahmed Fawzy, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia;Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt
Ishaq A. Zaafarany, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Khalid S. Khairou, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Sheigha S. Ashour, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Naeema Yarkandi, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
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Abstract
Oxidation of inositol (INOS) by hexachloroplatinate(IV) complex (HCP) in perchlorate solutions in the presence of palladium(II) catalyst was studied spectrophotometrically. The reaction rate was very slow in the absence of the catalyst. The reaction exhibited a first order dependence on [HCP], and fractional-first order dependences with respect to [INOS], [H+] and [Pd(II)]. Increasing ionic strength and dielectric constant was found to increase the oxidation rate. A probable oxidation mechanism has been suggested and the rate-law expression has been derived. Both spectral and kinetic evidences revealed formation of a 1:1 intermediate complex between INOS and Pd(II) prior to the rate-controlling step. The final oxidation product of inositol was identified by both spectral and chemical analyses as the corresponding monoketone derivative, namely inosose. The activation parameters of the second order rate constant were evaluated and discussed.
Keywords
Inositol, Hexachloroplatinate(IV), Oxidation, Palladium(II), Kinetics, Mechanism
To cite this article
Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Sheigha S. Ashour, Naeema Yarkandi, Kinetics and Mechanism of Palladium(II)-Catalyzed Oxidation of Inositol by Hexachloroplatinate(IV) in Perchlorate Solutions, American Journal of Applied Chemistry. Vol. 4, No. 5, 2016, pp. 185-191. doi: 10.11648/j.ajac.20160405.15
Copyright
Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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