Kinetics of oxidation of glycine and related substrates by diperiodatoargentate (III) |
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| Institution: | 1. Department of Chemistry, University of Roorkee, Roorkee 247 667, (UP), India;2. Department of Inorganic Chemistry, Guindy Campus, University of Madras, Chennai 600 025, India;1. School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, China;2. Key Laboratory of Marine Environmental Monitoring and Information Processing, Ministry of Industry and Information Technology, China;1. Dipartimento di Scienze Chimiche e Farmaccutiche, Universita Degli Studi di Trieste, Piazzale Europa 1, 34127, Trieste, Italy;2. Adam Mickiewicz University in Poznań, Faculty of Chemistry, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland;1. Chemistry Department, Yasouj University, Yasouj 75914-35, Iran;2. Chemistry Department, Payame Noor University, Ardekan, Iran;1. Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran;2. Department of Microbiology, Islamic Azad University, Damghan Branch, Damghan, Iran;3. Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran;1. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;2. Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee blvd., Sofia 1784, Bulgaria |
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| Abstract: | The reactions of diperiodatoargentate(III) with glycine and related compounds have been examined. The monoperiodatosilver(III) species acts as an active oxidant in comparison to that of diperiodatosilver(III) species. These reactions consist of three kinetically distinguishable steps-induction period, complexation and oxidation. Complexation of these substrates takes place with a second order rate constant of (0.2–1.6)×104 dm3 mol−1 s−1 whereas the redox process occurs at a rate of (0.3–6.0)×102 dm3 mol−1 s−1 except in case of cysteine with which these processes occurred by an order of magnitude faster. The rate of electron transfer from carboxylic acids to the silver(III) complex is observed to be several order of magnitude smaller in comparison to that of amino acids. Both the rate of complexation and electron transfer are influenced by the structure of the substrates. The aquated silver(III) species is found to be more reactive in comparison to the hydroxylated silver(III) species. |
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