Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study

Ahmed Fawzy; Ishaq A. Zaafarany; Khalid S. Khairou; Layla S. Almazroai; Badriah A. Al-Jahdali; Tahani M. Bawazeer

doi:doi:10.11648/j.ajpc.20160503.12

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Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study

Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Layla S. Almazroai, Badriah A. Al-Jahdali, Tahani M. Bawazeer

Published in American Journal of Physical Chemistry (Volume 5, Issue 3)

Received: 3 April 2016 Accepted: 9 April 2016 Published: 3 May 2016

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Abstract

The kinetics of oxidation of vanillin (VAN) by hexachloroplatinate(IV) has been investigated in perchloric acid solutions in the presence of ruthenium(III) catalyst at a constant ionic strength of 1.0 mol dm^-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction was not proceeding in the absence of the catalyst. The reaction exhibited first order kinetics with respect to both [HCP] and [Ru(III)] and less than unit order with respect to both [VAN] and [H⁺]. Increasing ionic strength and dielectric constant were found to increase the oxidation rate. The reaction mechanism adequately describing the kinetic results has been proposed. Both spectral and kinetic evidences revealed formation of an intermediate complex between vanillin substrate and ruthenium(III) catalyst prior to the rate-determining step. The complex reacts with the oxidant (HCP) by an inner-sphere mechanism leading to decomposition of the complex in the rate-determining step to give rise to the final oxidation products which were identified by both spectral and chemical analyses as vanillic acid and tetrachloroplatinate(II). The rate law expression for the catalyzed reaction was deduced. The reaction constants involved in the different steps of the reaction mechanism have been evaluated. The activation parameters associated with the rate-limiting step of the reaction, along with the thermodynamic quantities of the equilibrium constant have been evaluated and discussed.

Published in	American Journal of Physical Chemistry (Volume 5, Issue 3)
DOI	10.11648/j.ajpc.20160503.12
Page(s)	56-64
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Catalyzed-Oxidation, Vanillin, Hexachloroplatinate(IV), Ruthenium(III), Kinetics, Mechanism

References

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Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Layla S. Almazroai, Badriah A. Al-Jahdali, et al. (2016). Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. American Journal of Physical Chemistry, 5(3), 56-64. https://doi.org/10.11648/j.ajpc.20160503.12

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ACS Style

Ahmed Fawzy; Ishaq A. Zaafarany; Khalid S. Khairou; Layla S. Almazroai; Badriah A. Al-Jahdali, et al. Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. Am. J. Phys. Chem. 2016, 5(3), 56-64. doi: 10.11648/j.ajpc.20160503.12

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AMA Style

Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Layla S. Almazroai, Badriah A. Al-Jahdali, et al. Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. Am J Phys Chem. 2016;5(3):56-64. doi: 10.11648/j.ajpc.20160503.12

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@article{10.11648/j.ajpc.20160503.12,
  author = {Ahmed Fawzy and Ishaq A. Zaafarany and Khalid S. Khairou and Layla S. Almazroai and Badriah A. Al-Jahdali and Tahani M. Bawazeer},
  title = {Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study},
  journal = {American Journal of Physical Chemistry},
  volume = {5},
  number = {3},
  pages = {56-64},
  doi = {10.11648/j.ajpc.20160503.12},
  url = {https://doi.org/10.11648/j.ajpc.20160503.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpc.20160503.12},
  abstract = {The kinetics of oxidation of vanillin (VAN) by hexachloroplatinate(IV) has been investigated in perchloric acid solutions in the presence of ruthenium(III) catalyst at a constant ionic strength of 1.0 mol dm-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction was not proceeding in the absence of the catalyst. The reaction exhibited first order kinetics with respect to both [HCP] and [Ru(III)] and less than unit order with respect to both [VAN] and [H+]. Increasing ionic strength and dielectric constant were found to increase the oxidation rate. The reaction mechanism adequately describing the kinetic results has been proposed. Both spectral and kinetic evidences revealed formation of an intermediate complex between vanillin substrate and ruthenium(III) catalyst prior to the rate-determining step. The complex reacts with the oxidant (HCP) by an inner-sphere mechanism leading to decomposition of the complex in the rate-determining step to give rise to the final oxidation products which were identified by both spectral and chemical analyses as vanillic acid and tetrachloroplatinate(II). The rate law expression for the catalyzed reaction was deduced. The reaction constants involved in the different steps of the reaction mechanism have been evaluated. The activation parameters associated with the rate-limiting step of the reaction, along with the thermodynamic quantities of the equilibrium constant have been evaluated and discussed.},
 year = {2016}
}

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TY - JOUR
T1 - Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study
AU - Ahmed Fawzy
AU - Ishaq A. Zaafarany
AU - Khalid S. Khairou
AU - Layla S. Almazroai
AU - Badriah A. Al-Jahdali
AU - Tahani M. Bawazeer
Y1 - 2016/05/03
PY - 2016
N1 - https://doi.org/10.11648/j.ajpc.20160503.12
DO - 10.11648/j.ajpc.20160503.12
T2 - American Journal of Physical Chemistry
JF - American Journal of Physical Chemistry
JO - American Journal of Physical Chemistry
SP - 56
EP - 64
PB - Science Publishing Group
SN - 2327-2449
UR - https://doi.org/10.11648/j.ajpc.20160503.12
AB - The kinetics of oxidation of vanillin (VAN) by hexachloroplatinate(IV) has been investigated in perchloric acid solutions in the presence of ruthenium(III) catalyst at a constant ionic strength of 1.0 mol dm-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction was not proceeding in the absence of the catalyst. The reaction exhibited first order kinetics with respect to both [HCP] and [Ru(III)] and less than unit order with respect to both [VAN] and [H+]. Increasing ionic strength and dielectric constant were found to increase the oxidation rate. The reaction mechanism adequately describing the kinetic results has been proposed. Both spectral and kinetic evidences revealed formation of an intermediate complex between vanillin substrate and ruthenium(III) catalyst prior to the rate-determining step. The complex reacts with the oxidant (HCP) by an inner-sphere mechanism leading to decomposition of the complex in the rate-determining step to give rise to the final oxidation products which were identified by both spectral and chemical analyses as vanillic acid and tetrachloroplatinate(II). The rate law expression for the catalyzed reaction was deduced. The reaction constants involved in the different steps of the reaction mechanism have been evaluated. The activation parameters associated with the rate-limiting step of the reaction, along with the thermodynamic quantities of the equilibrium constant have been evaluated and discussed.
VL - 5
IS - 3
ER -

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Author Information

Ahmed Fawzy

Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
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
Layla S. Almazroai

Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Badriah A. Al-Jahdali

Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Tahani M. Bawazeer

Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia

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Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Layla S. Almazroai, Badriah A. Al-Jahdali, et al. (2016). Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. American Journal of Physical Chemistry, 5(3), 56-64. https://doi.org/10.11648/j.ajpc.20160503.12

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Ahmed Fawzy; Ishaq A. Zaafarany; Khalid S. Khairou; Layla S. Almazroai; Badriah A. Al-Jahdali, et al. Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. Am. J. Phys. Chem. 2016, 5(3), 56-64. doi: 10.11648/j.ajpc.20160503.12

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AMA Style

Ahmed Fawzy, Ishaq A. Zaafarany, Khalid S. Khairou, Layla S. Almazroai, Badriah A. Al-Jahdali, et al. Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study. Am J Phys Chem. 2016;5(3):56-64. doi: 10.11648/j.ajpc.20160503.12

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@article{10.11648/j.ajpc.20160503.12,
  author = {Ahmed Fawzy and Ishaq A. Zaafarany and Khalid S. Khairou and Layla S. Almazroai and Badriah A. Al-Jahdali and Tahani M. Bawazeer},
  title = {Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study},
  journal = {American Journal of Physical Chemistry},
  volume = {5},
  number = {3},
  pages = {56-64},
  doi = {10.11648/j.ajpc.20160503.12},
  url = {https://doi.org/10.11648/j.ajpc.20160503.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpc.20160503.12},
  abstract = {The kinetics of oxidation of vanillin (VAN) by hexachloroplatinate(IV) has been investigated in perchloric acid solutions in the presence of ruthenium(III) catalyst at a constant ionic strength of 1.0 mol dm-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction was not proceeding in the absence of the catalyst. The reaction exhibited first order kinetics with respect to both [HCP] and [Ru(III)] and less than unit order with respect to both [VAN] and [H+]. Increasing ionic strength and dielectric constant were found to increase the oxidation rate. The reaction mechanism adequately describing the kinetic results has been proposed. Both spectral and kinetic evidences revealed formation of an intermediate complex between vanillin substrate and ruthenium(III) catalyst prior to the rate-determining step. The complex reacts with the oxidant (HCP) by an inner-sphere mechanism leading to decomposition of the complex in the rate-determining step to give rise to the final oxidation products which were identified by both spectral and chemical analyses as vanillic acid and tetrachloroplatinate(II). The rate law expression for the catalyzed reaction was deduced. The reaction constants involved in the different steps of the reaction mechanism have been evaluated. The activation parameters associated with the rate-limiting step of the reaction, along with the thermodynamic quantities of the equilibrium constant have been evaluated and discussed.},
 year = {2016}
}

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