Rapid exchange of Ca2+ between the bulk and the coordination site of ascorbic acid radical anion as observed by ESR spectroscopy |
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| Institution: | 1. Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie str., 50-383 Wrocław, Poland;2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Vecna Pot 113, SI-1000 Ljubljana, Slovenia;1. Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center on Fundamental and Applied Heterochemistry, 11 Arany Janos Str., RO-400028 Cluj-Napoca, România |
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| Abstract: | The rate constant for dissociation of Ca(AA−)]+, where (AA−) is the radical anion of ascorbic acid, has been measured by observation of specific line broadening in the ESR spectrum. Its value in DMSO at 298 K is 4.68 × 105 s−1. The mechanism for the line broadening is a combination of a g and a hyperfine shift upon coordination of the metal ion. |
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