Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 27, Pages 9114-9119Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201903749
Keywords
copper; DFT; oxygen; peroxide; X-ray emission spectroscopy
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Funding
- Max Planck Society
- National Institutes of Health [GMR37-147365]
- Alexander von Humboldt Foundation
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Valence-to-Core (VtC) X-ray emission spectroscopy (XES) was used to directly detect the presence of an O-O bond in a complex comprising the [Cu-2(II)(mu-eta(2):eta(2)-O-2)](2+) core relative to its isomer with a cleaved O-O bond having a [Cu-2(III)(mu-O)(2)](2+) unit. The experimental studies are complemented by DFT calculations, which show that the unique VtC XES feature of the [Cu-2(II)(mu-eta(2):eta(2)-O-2)](2+) core corresponds to the copper stabilized in-plane 2p pi peroxo molecular orbital. These calculations illustrate the sensitivity of VtC XES for probing the extent of O-O bond activation in mu-eta(2):eta(2)-O-2 species and highlight the potential of this method for time-resolved studies of reaction mechanisms.
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