Uncatalyzed and Ruthenium(III) Catalyzed Oxidation of Aspartame by Potassium Permanganate in Aqueous Alkaline Medium: A Comparative Kinetic Study

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• 作者：Laxmi Jattinagoudar ; Sharanappa Nandibewoor…
• 关键词：Aspartame ; Permanganate(VII) ; Ruthenium(III) ; Kinetics ; Oxidation
• 刊名：Journal of Solution Chemistry
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：45
• 期：4
• 页码：497-517
• 全文大小：1,009 KB
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  16.Bugarcic, Z.D., Nandibewoor, S.T., Hamza, M.S.A., Heimemann, F., Eldik, R.V.: Kinetics and mechanism of the reactions of Pd(II) complexes with azoles and diazines. Crystal structure of [Pd(bpma)(H2O)](ClO4)2·2H2O. Dalton Trans. 2984–2990 (2006). doi:10.​1039/​b516771j
  
• 作者单位：Laxmi Jattinagoudar (1)
  Sharanappa Nandibewoor (1)
  Shivamurti Chimatadar (1)
  
  1. P. G. Department of Studies in Chemistry, Karnatak University, Dharwad, 580 003, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Industrial Chemistry and Chemical Engineering
  Geochemistry
  Oceanography
  Inorganic Chemistry
  Condensed Matter
  
• 出版者：Springer Netherlands
• ISSN：1572-8927

文摘

The reaction kinetics and mechanism of the oxidation of aspartame by permanganate ion in the absence and presence of ruthenium(III) in alkaline media has been studied spectrophotometrically at 298 K and at a constant ionic strength of 1.10 mol·dm−3. The uncatalyzed and catalyzed reaction has a stoichiometry, 1:2 (aspartame:\( {\text{MnO}}_{4}^{ - } \)). The oxidation products, \( {\text{MnO}}_{4}^{2 - } \) and 6-benzyl-3-hydroxy-3-methylpiperazine-2,5-dione were characterized by spectral studies. The order with respect to \( {\text{MnO}}_{4}^{ - } \) concentration was unity and that of aspartame was less than unity in the uncatalyzed and catalyzed reactions. The alkali KOH concentration was varied and it was found that as the KOH concentration increased, the rate increased with less than unit order in either the absence or presence of catalyst. The order with respect to ruthenium(III) concentration was unity. The species [Ru(H₂O)₅OH]2+ was found to be the active species of ruthenium(III). The effect of ionic strength and solvent polarity were studied. Based on experimental results suitable mechanisms were proposed. Activation parameters and thermodynamic quantities were determined and discussed.