Using XANES to Monitor the Oxidation State of Cobalt Complexes

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Contents Vol 60(3)

doi:10.1071/CH06307

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, Trevor W. Hambley ^A ^D

^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





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Australian Journal of Chemistry 60(3) 180–183 http://dx.doi.org/10.1071/CH06307
Submitted: 21 August 2006 Accepted: 14 February 2007 Published online: 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.