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Rapid exchange of Ca2+ between the bulk and the coordination site of ascorbic acid radical anion as observed by ESR spectroscopy

✍ Scribed by Jean Noel Gex; Claude Daul; Alex Von Zelewsky

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 201 KB
Volume: 132
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80123-3

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✦ Synopsis

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~ 10' s-'. The mechanism for the line broadening is a combination of a g and a hypertine shift upon coordination of the metal ion.