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Outer-sphere electron-transfer reactions of ascorbate anions
Abstract
Rate constants for the one-electron oxidation of ascorbate dianion (A2-) by bis(terpyridine)cobalt(III)ion (8.5 × 106 dm3 mol-1 s-1) and pentaammine(pyridine)ruthenium(III) ion (6.0 × 109 dm3 mol-1 s-1), and of the monoanion (HA-) by tetraammine (bipyridine)ruthenium(III)ion (2.1 × 105 dm3 mol-1s-1) have been determined in aqueous solution at 25ºC and ionic strength 0.1 (NaNO3 or NaClO4). It is shown that these rate constants, and other published rate constants for oxidation of HA- and A2-, are consistent with the Marcus cross relation, on the assumption that the self-exchange rate constants for both the HA-/HA and A2-/A-couples are 106 dm3 mol-1 s-1. One electron redox potentials for the ascorbate/dehydroascorbate system have been derived from scattered literature data.
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Cited by
Ascorbic acid: Chemistry, biology and the treatment of cancer
Du, J., Cullen, J. J., & Buettner, G. R. (2012) · Biochimica et Biophysica Acta (BBA) - Reviews on Cancer · doi:10.1016/j.bbcan.2012.06.003 · Cited by 1,070
Catalytic Metals, Ascorbate and Free Radicals: Combinations to Avoid
Buettner, G. R., & Jurkiewicz, B. A. (1996) · Radiation Research · doi:10.2307/3579271 · Cited by 887
Transition metals as catalysts of “autoxidation” reactions
Miller, D. (1990) · Free Radical Biology and Medicine · doi:10.1016/0891-5849(90)90148-c · Cited by 739
Ascorbic acid: The chemistry underlying its antioxidant properties
Njus, D., Kelley, P. M., Tu, Y.-J., & Schlegel, H. B. (2020) · Free Radical Biology and Medicine · doi:10.1016/j.freeradbiomed.2020.07.013 · Cited by 554
Computational electrochemistry: prediction of liquid-phase reduction potentials
Marenich, A. V., Ho, J., Coote, M. L., Cramer, C. J., & Truhlar, D. G. (2014) · Phys. Chem. Chem. Phys. · doi:10.1039/c4cp01572j · Cited by 508
Metadata
- Authors
- Williams, N., & Yandell, J.
- Venue
- Australian Journal of Chemistry
- Publisher
- CSIRO Publishing
- Published
- 1982-06-01
- Volume
- 35
- Issue
- 6
- Pages
- 1133-1144
- ISSN
- 0004-9425 (ISSN-L)
- 1445-0038
- OpenAlex
- W2080229355
- Cited by
- 197
- References
- 0
- FWCI
- 2.24
- Type
- journal article
- Language
- en
- Open access
- closed
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- Williams, N., & Yandell, J. (1982). Outer-sphere electron-transfer reactions of ascorbate anions. Australian Journal of Chemistry. https://doi.org/10.1071/ch9821133
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