Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 4, Pages 1261-1267Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200600792
Keywords
CO2 activation; electron transfer; EPR spectroscopy; MgO surface
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The CO2- radical anion has been generated at the surface of MgO by direct electron transfer from surface trapped excess electrons and characterized by electron paramagnetic resonance spectroscopy. Both C-13 and O-17 hyperfine structures have been resolved for the first time, leading to a detailed mapping of the unpaired electron spin density distribution over the entire radical anion. The magnetic equivalence of the two O nuclei has been ascertained allowing a side-on a sorption structure at low-coordinate Mg2+ ions to be proposed for the surface stabilized radical.
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