Using XANES to Monitor the Oxidation State of Cobalt Complexes

Matthew D. Hall; Clare K. Underwood; Timothy W. Failes; Garry J. Foran; Trevor W. Hambley

doi:10.1071/CH06307

RESEARCH ARTICLE

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Using XANES to Monitor the Oxidation State of Cobalt Complexes

Matthew D. Hall ^A ^C , Clare K. Underwood ^A , Timothy W. Failes ^A , Garry J. Foran ^B and Trevor W. Hambley ^A ^D

+ Author Affiliations

- Author Affiliations

^A Centre for Heavy Metals Research, School of Chemistry, University of Sydney, Sydney NSW 2006, Australia.

^B Australian Synchrotron Research Program, ANSTO, Private Mail Bag 1, Menai NSW 2234, Australia.

^C Current address: Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda MD 20892-4256, USA.

^D Corresponding author. Email: t.hambley@chem.usyd.edu.au

Australian Journal of Chemistry 60(3) 180-183 https://doi.org/10.1071/CH06307
Submitted: 21 August 2006 Accepted: 14 February 2007 Published: 2 April 2007

Abstract

X-Ray absorption near-edge structure (XANES) spectroscopy was used to monitor the oxidation state of cobalt following treatment of Co^III complexes with reducing agents such as ascorbate and cysteine. It was established that the XANES spectra of mixtures of Co^II and Co^III complexes can be used to calculate proportions of the two oxidation states by monitoring the height of the Co K-edge. The relationships developed were used to estimate proportions of each complex in solutions of Co^III complexes treated with reducing agents.

Acknowledgments

This work was performed at the Australian National Beamline Facility with support from the Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities Program. We also thank the Sydney Cancer Research Fund for financial support.

References

Using XANES to Monitor the Oxidation State of Cobalt Complexes

Abstract

Acknowledgments

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