Kinetics and Stoichiometry of the Reduction of Hydrogen Peroxide by an Aminocarboxylactocobaltate(II) Complex in Aqueous Medium


The kinetics and stoichiometry of the reduction of H2O2 by an aminocaboxylactocobaltate(II) complex (hereafter[CoHEDTAOH2]-) in aqueous medium have been studied under the following conditions: T = 29℃ ± 1℃, Ionic Strength, I = 0.50 mol dm-3 (NaClO4), [H+] = 1 × 10-3 mol dm-3. The ratio from the stoichiometric study conforms to the equation 2[CoHEDTAOH2]- + H2O2 + 2H+ → 2 [CoHEDTAOH2] + 2H2O. The rate of reaction varied linearly to the first power of the concentrations of the reductant and oxidant and displayed inverse dependence on acid concentration. The plot of acid dependent rate constant versus [H+]-1 was linear with zero intercept. The [CoHEDTAOH2]- - H2O2 reaction was insensitive to the change in ionic strength of the medium suggesting interaction of charged and uncharged species at the activated complex. The Michaelis-Menten plot of was linear without intercept which suggested absence of intermediate complex. Evidences in this paper showed that the reaction occurred through the outer-sphere mechanism.

Share and Cite:

Onu, A. , Iyun, J. and Idris, O. (2015) Kinetics and Stoichiometry of the Reduction of Hydrogen Peroxide by an Aminocarboxylactocobaltate(II) Complex in Aqueous Medium. Open Journal of Inorganic Chemistry, 5, 75-82. doi: 10.4236/ojic.2015.54009.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Fenton, H.J.H. (1893) Fenton Reaction. Proceedings of the Chemical Society, London, 9, 113-115.
[2] Beeman, L.A. and Reichert, J.S. (1953) The Bleaching of Pulp. TAPPI Monography Series No. 10, Newyork Chapter XII.
[3] Salem, I.A., El-Maazawi, M. and Zaki, A.B. (2000) Kinetics and Mechanisms of Decomposition Reaction of Hydrogen Peroxide in Presence of Metal Complexes. International Journal of Chemical Kinetics, 32, 643-666.<643::AID-KIN1>3.0.CO;2-C
[4] Sanderson, W.R. (1995) Hydrogen Peroxide in Clean Processes. In: Clark, J.H., Ed., Chemistry of Waste Minimization, Blakie Academic & Professional, Glasgow, 247-460.
[5] Sreeram, K.J., Gayatri, R., Rao, J.R., Nair, B.U. and Ramasami, T. (1998) Use of Hydrogen peroxide for Tannery and Waste Water Treatment. Journal of Scientific & Industrial Research, 57, 64-69.
[6] Halliwell, B., Clement, M.V. and Long, L.H. (2000) Hydrogen Peroxide in the Human Body. FEBS Letters, 486, 10-13.
[7] Linley, E., Denger, S.P., McDonnell, G., Simons, C. and Mailand, J. (2012) Use of Hydrogen Peroxide as a Biocide: New Consideration of Its Mechanisms of Biocidal Action. Journal of Antimicrobial Chemotherapy, 24, 1-8.
[8] Gordon, G. (1989) The Role of Transition Metal Ions on Oxyhalogen Redox Reactions. Pure and Applied Chemistry, 61, 873-878.
[9] Ahmed, M. and Subramani, K. (2008) Kinetics of Oxidation of Cobalt (III) Complexes of α-Hydroxy Acids by Hydrogen Peroxide in the Presence of Surfactants. E-Journal of Chemistry, 5, 43-51.
[10] Impert, O., Katafias, A., Fenska, J. and Kita, P. (2011) Kinetics and Mechanisms of Electron Transfer Processes in a Hydrogen Peroxide-Trispicolinatoruthenate(II) System. Transition Metal Chemistry, 37, 7-16.
[11] Griend, D.V., Golden, J.S. and Arrington, C.A. (2002) Kinetics and Mechanism of Chromate Reduction with Hydrogen Peroxide in Base. Inorganic Chemistry, 41, 7042-7048.
[12] Schmitz, G. and Furrow, S. (2012) Kinetics of the Iodate Reduction by Hydrogen Peroxide and Reaction with the Briggs-Rauscher and Bray-Liebhafsky Oscillating Reactions. The Journal of Physical Chemistry, 14, 5711-5717.
[13] Yong, L.Z., Dong, M., Yan-Xia, C. and Shen, Y. (2014) The Redox Reaction of Hydrogen Peroxide at an Au(100) Electrode: Implications for Oxygen Reduction Kinetics. Electrochemistry Communications, 39, 19-21.
[14] Banerjee, P. and Pujari, M.P. (1981) Kinetics of the Oxidation of ethylenediaminetetraacetato and n-(2-Hydroxye- thyl)Ethylenediamine-N, N’, N’-Triacetato Complexes of Cobalt(II) by Hydrogen Peroxide in Aqueous Acidic Medium. Bulletin of the Chemical Society of Japan, 54, 2496-2498.
[15] Rao, P.S.M., Rao, M.R.A. and Vani, P. (1992) Kinetic and Mechanism of Reduction of Thallium(III) by Hydrogen Peroxide in Perchloric Acid Medium. Reaction Kinetics and Catalysis Letters, 48, 519-528.
[16] Van Niekerk, W., Pienaar, J.J., Lachmann, G., Van Eldik, R. and Hamza, M. (2007) A Kinetic and Mechanism Study of the Chromium(VI) Reduction by Hydrogen Peroxide in Acidic Aqueous Solutions. Water SA, 33, 619-625.
[17] Mansour, A.M. (2003) Kinetics and Mechanism of the Oxidation of [N-(2-Hydroxyethyl)Ethylenediamine-N’,N’,N’-Triacetatocobalt(II) by Vanadate Ion. Transition Metal Chemistry, 28, 276-279.
[18] Iyun, J.F., Ayoko, G.A. and Lohdip, Y.N. (1992) The Kinetics and Mechanism of the Oxidation of Diaquotetrakis(2,2’-bipyridine)-μ-Oxodiruthenium(III) Ion by Bromated in Aqueous Perchloric Acid. Polyhedron, 11, 2389-2394.
[19] Iyun, J.F., Ayoko, G.A. and Mamman, S. (1993) Oxidation of N-(2-hydroxyethyl)Ethylenediaminetriacetate by Tris (Polypyridy)Iron(III) Complexes and the Dodecatungstocobaltate(III) Ion. Transition Metal Chemistry, 18, 475-477.
[20] Iyun, J.F., Ayoko, G.A. and El-Idris, I.F. (1993) Electron Transfer at Tetrahedral Cobalt(II), Part IV: Kinetics of Silver (I) Catalysed Chlorate Reduction. Transition Metal Chemistry, 18, 275-278.
[21] Iyun, J.F. and Ukoha, P.O. (1999) Kinetics and Mechanism of Oxidation of 1,3-Dihydroxybenzene by Trioxoiodate(V) Ion in Aqueous Perchloric Acid Medium. Indian Journal of Chemistry, 38A, 180-182.
[22] Mamman, S. and Iyun, J.F. (2007) Kinetics and Mechanisms of the Reactions of Benzenediols with Binuclear Oxalato Cobaltate(III) Complex. International Journal of Pure and Applied Chemistry, 2, 407-413.
[23] Abdel-Khalek, A.A., Khalil, M.M. and Khaled, E.S.H. (1993) Kinetics of Oxidation of [N-(2-hydroxyethyl)-Ethylene-Diamine-N, N’, N’-Triacetato]Cobalt(II) by N-Bromosuccinimide. Transition Metal Chemistry, 18, 153-157.
[24] Gurkan, R. (2004) Determination of Trace Amount of Iodide by Inhibition Kinetic Spectrophotometric Method. Turkish Journal of Chemistry, 28, 181-191.
[25] Perveen, A., Nezamoleslam, T. and Naqvi, I.I. (2013) Preparation of Cobalt(III) Complexes with Trans-1,2-Diami-nocyclohexane N,N,N,’N’-Tetraacetatic Acid (CDTA) and Ethylenediamine Tetraacetic Acid (EDTA). African Journal of Pure and Applied Chemistry, 7, 218-224.
[26] Gupta, K.S. and Gupta, Y.K. (1984) Hydrogen Ion Dependence of Reaction Rates and Mechanism. Journal of Chemical Education, 61, 972-978.
[27] Creutz, C. and Sutin, N. (1974) Kinetics of the Reactions of Sodium Dithionite with Dioxygen and Hydrogen Peroxide. Inorganic Chemistry, 13, 2041-2043.
[28] Iyun, J.F., Lawal, H.M. and Olagbemiro, O.T. (1995) Kinetics and Mechanism of Oxidation of 1, 4-Benzenediol by Trisoxalatocobaltate(III) Ion in Aqueous Acid Medium. Indian Journal of Chemistry B, 34, 446-448.
[29] Mahadevappa, D.S. and Gowda, N.M.M. (1991) Kinetics and Mechanism of Oxidation of Indigo Carmine by Hypohaltes. International Journal of Chemical Kinetics, 23, 27-35.
[30] Wilkins, R.G. (1974) The Study of Kinetics and Mechanism of Reactions of Transition Metal Complexes. Allyn and Bacon, Boston, 229-237.
[31] Cooke, D.O. (1979) Inorganic Reaction Mechanisms; The Chemical Society Monographs for Teachers, No.33. The Chemical Society, London, 5-69.
[32] Onu, A.D., Iyun, J.F. and Idris, S.O. (2009) The Kinetics of the Reduction of Tetraoxoiodate(VII) by n-(2-Hydroxyethyl)Ethylenediaminetriacetatocobaltate(II) Ion in Aqueous Perchloric Acid. Transition Metal Chemistry, 34, 849-853.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.