Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media
The kinetics and mechanism of the electron transfer of dl-Aspartic acid (Asp) by Mn (VII) in alkaline medium has been studied spectrophotometrically over the range 2.0≤103[Asp] ≤5.0 mol dm−3; 0.01≤[OH-]≤0.05 mol dm−3; 298≤T≤318 K and I=0.05 mol dm−3 (KNO3). The reaction exhibits first-order dependen...
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Wiley
2013-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2013/724505 |
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| author | M. Sanjana A. K. Patnaik S. K. Badamali P. Mohanty |
| author_facet | M. Sanjana A. K. Patnaik S. K. Badamali P. Mohanty |
| author_sort | M. Sanjana |
| collection | DOAJ |
| description | The kinetics and mechanism of the electron transfer of dl-Aspartic acid (Asp) by Mn (VII) in alkaline medium has been studied spectrophotometrically over the range 2.0≤103[Asp] ≤5.0 mol dm−3; 0.01≤[OH-]≤0.05 mol dm−3; 298≤T≤318 K and I=0.05 mol dm−3 (KNO3). The reaction exhibits first-order dependence in [MnO4-]T but shows fractional-order dependence in both [Asp]T and [OH−]T. The reaction was studied in the presence of sodium dodecyl sulfate (SDS); an increase in the rate with the increase in the micellar concentration was observed. The products were characterized by spectral analysis. A mechanism involving free radicals is proposed. Asp binds MnO4- to form a complex that subsequently decomposes to products. Activation parameters ΔH° (kJ mol−1) and ΔS° (JK−1 mol−1) for the reaction are 5.62 ± 0.35 and −227.65 ± 1.1, respectively. The negative value of ΔS° indicates that oxidation occurs via inner sphere mechanism. |
| format | Article |
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| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
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| series | Journal of Chemistry |
| spelling | doaj-art-2e2a0a07d0ed498897e46a4d0c9042aa2025-08-20T03:55:07ZengWileyJournal of Chemistry2090-90632090-90712013-01-01201310.1155/2013/724505724505Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar MediaM. Sanjana0A. K. Patnaik1S. K. Badamali2P. Mohanty3Department of Chemistry, Utkal University, Bhubaneswar 751004, IndiaDepartment of Chemistry, Khallikote Autonomous College, Berhampur 760001, IndiaDepartment of Chemistry, Utkal University, Bhubaneswar 751004, IndiaDepartment of Chemistry, Utkal University, Bhubaneswar 751004, IndiaThe kinetics and mechanism of the electron transfer of dl-Aspartic acid (Asp) by Mn (VII) in alkaline medium has been studied spectrophotometrically over the range 2.0≤103[Asp] ≤5.0 mol dm−3; 0.01≤[OH-]≤0.05 mol dm−3; 298≤T≤318 K and I=0.05 mol dm−3 (KNO3). The reaction exhibits first-order dependence in [MnO4-]T but shows fractional-order dependence in both [Asp]T and [OH−]T. The reaction was studied in the presence of sodium dodecyl sulfate (SDS); an increase in the rate with the increase in the micellar concentration was observed. The products were characterized by spectral analysis. A mechanism involving free radicals is proposed. Asp binds MnO4- to form a complex that subsequently decomposes to products. Activation parameters ΔH° (kJ mol−1) and ΔS° (JK−1 mol−1) for the reaction are 5.62 ± 0.35 and −227.65 ± 1.1, respectively. The negative value of ΔS° indicates that oxidation occurs via inner sphere mechanism.http://dx.doi.org/10.1155/2013/724505 |
| spellingShingle | M. Sanjana A. K. Patnaik S. K. Badamali P. Mohanty Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media Journal of Chemistry |
| title | Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media |
| title_full | Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media |
| title_fullStr | Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media |
| title_full_unstemmed | Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media |
| title_short | Kinetics and Mechanism of Electron Transfer to Heptavalent Manganese by DL-Aspartic Acid in Alkaline Aqueous and Micellar Media |
| title_sort | kinetics and mechanism of electron transfer to heptavalent manganese by dl aspartic acid in alkaline aqueous and micellar media |
| url | http://dx.doi.org/10.1155/2013/724505 |
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